* [PATCH 1/4] sched/fair: Only set slice protection at pick time
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
@ 2026-01-30 9:34 ` Peter Zijlstra
2026-01-30 15:52 ` Vincent Guittot
2026-01-30 9:34 ` [PATCH 2/4] sched/eevdf: Update se->vprot in reweight_entity() Peter Zijlstra
` (7 subsequent siblings)
8 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-01-30 9:34 UTC (permalink / raw)
To: mingo
Cc: peterz, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies
We should not (re)set slice protection in the sched_change pattern
which calls put_prev_task() / set_next_task().
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/fair.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5420,7 +5420,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, st
}
static void
-set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
+set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, bool first)
{
clear_buddies(cfs_rq, se);
@@ -5435,7 +5435,8 @@ set_next_entity(struct cfs_rq *cfs_rq, s
__dequeue_entity(cfs_rq, se);
update_load_avg(cfs_rq, se, UPDATE_TG);
- set_protect_slice(cfs_rq, se);
+ if (first)
+ set_protect_slice(cfs_rq, se);
}
update_stats_curr_start(cfs_rq, se);
@@ -8958,13 +8959,13 @@ pick_next_task_fair(struct rq *rq, struc
pse = parent_entity(pse);
}
if (se_depth >= pse_depth) {
- set_next_entity(cfs_rq_of(se), se);
+ set_next_entity(cfs_rq_of(se), se, true);
se = parent_entity(se);
}
}
put_prev_entity(cfs_rq, pse);
- set_next_entity(cfs_rq, se);
+ set_next_entity(cfs_rq, se, true);
__set_next_task_fair(rq, p, true);
}
@@ -13578,7 +13579,7 @@ static void set_next_task_fair(struct rq
for_each_sched_entity(se) {
struct cfs_rq *cfs_rq = cfs_rq_of(se);
- set_next_entity(cfs_rq, se);
+ set_next_entity(cfs_rq, se, first);
/* ensure bandwidth has been allocated on our new cfs_rq */
account_cfs_rq_runtime(cfs_rq, 0);
}
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 1/4] sched/fair: Only set slice protection at pick time
2026-01-30 9:34 ` [PATCH 1/4] sched/fair: Only set slice protection at pick time Peter Zijlstra
@ 2026-01-30 15:52 ` Vincent Guittot
0 siblings, 0 replies; 70+ messages in thread
From: Vincent Guittot @ 2026-01-30 15:52 UTC (permalink / raw)
To: Peter Zijlstra
Cc: mingo, juri.lelli, dietmar.eggemann, rostedt, bsegall, mgorman,
vschneid, linux-kernel, wangtao554, quzicheng, kprateek.nayak,
wuyun.abel, dsmythies
On Fri, 30 Jan 2026 at 10:47, Peter Zijlstra <peterz@infradead.org> wrote:
>
> We should not (re)set slice protection in the sched_change pattern
> which calls put_prev_task() / set_next_task().
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
> ---
> kernel/sched/fair.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -5420,7 +5420,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, st
> }
>
> static void
> -set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
> +set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, bool first)
> {
> clear_buddies(cfs_rq, se);
>
> @@ -5435,7 +5435,8 @@ set_next_entity(struct cfs_rq *cfs_rq, s
> __dequeue_entity(cfs_rq, se);
> update_load_avg(cfs_rq, se, UPDATE_TG);
>
> - set_protect_slice(cfs_rq, se);
> + if (first)
> + set_protect_slice(cfs_rq, se);
> }
>
> update_stats_curr_start(cfs_rq, se);
> @@ -8958,13 +8959,13 @@ pick_next_task_fair(struct rq *rq, struc
> pse = parent_entity(pse);
> }
> if (se_depth >= pse_depth) {
> - set_next_entity(cfs_rq_of(se), se);
> + set_next_entity(cfs_rq_of(se), se, true);
> se = parent_entity(se);
> }
> }
>
> put_prev_entity(cfs_rq, pse);
> - set_next_entity(cfs_rq, se);
> + set_next_entity(cfs_rq, se, true);
>
> __set_next_task_fair(rq, p, true);
> }
> @@ -13578,7 +13579,7 @@ static void set_next_task_fair(struct rq
> for_each_sched_entity(se) {
> struct cfs_rq *cfs_rq = cfs_rq_of(se);
>
> - set_next_entity(cfs_rq, se);
> + set_next_entity(cfs_rq, se, first);
> /* ensure bandwidth has been allocated on our new cfs_rq */
> account_cfs_rq_runtime(cfs_rq, 0);
> }
>
>
^ permalink raw reply [flat|nested] 70+ messages in thread
* [PATCH 2/4] sched/eevdf: Update se->vprot in reweight_entity()
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
2026-01-30 9:34 ` [PATCH 1/4] sched/fair: Only set slice protection at pick time Peter Zijlstra
@ 2026-01-30 9:34 ` Peter Zijlstra
2026-01-30 16:20 ` Vincent Guittot
2026-01-30 9:34 ` [PATCH 3/4] sched/fair: Increase weight bits for avg_vruntime Peter Zijlstra
` (6 subsequent siblings)
8 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-01-30 9:34 UTC (permalink / raw)
To: mingo
Cc: peterz, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies, Zhang Qiao
From: Wang Tao <wangtao554@huawei.com>
In the EEVDF framework with Run-to-Parity protection, `se->vprot` is an
independent variable defining the virtual protection timestamp.
When `reweight_entity()` is called (e.g., via nice/renice), it performs
the following actions to preserve Lag consistency:
1. Scales `se->vlag` based on the new weight.
2. Calls `place_entity()`, which recalculates `se->vruntime` based on
the new weight and scaled lag.
However, the current implementation fails to update `se->vprot`, leading
to mismatches between the task's actual runtime and its expected duration.
Fixes: 63304558ba5d ("sched/eevdf: Curb wakeup-preemption")
Suggested-by: Zhang Qiao <zhangqiao22@huawei.com>
Signed-off-by: Wang Tao <wangtao554@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260120123113.3518950-1-wangtao554@huawei.com
---
kernel/sched/fair.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3790,6 +3790,8 @@ static void reweight_entity(struct cfs_r
unsigned long weight)
{
bool curr = cfs_rq->curr == se;
+ bool rel_vprot = false;
+ u64 vprot;
if (se->on_rq) {
/* commit outstanding execution time */
@@ -3797,6 +3799,11 @@ static void reweight_entity(struct cfs_r
update_entity_lag(cfs_rq, se);
se->deadline -= se->vruntime;
se->rel_deadline = 1;
+ if (curr && protect_slice(se)) {
+ vprot = se->vprot - se->vruntime;
+ rel_vprot = true;
+ }
+
cfs_rq->nr_queued--;
if (!curr)
__dequeue_entity(cfs_rq, se);
@@ -3812,6 +3819,9 @@ static void reweight_entity(struct cfs_r
if (se->rel_deadline)
se->deadline = div_s64(se->deadline * se->load.weight, weight);
+ if (rel_vprot)
+ vprot = div_s64(vprot * se->load.weight, weight);
+
update_load_set(&se->load, weight);
do {
@@ -3823,6 +3833,8 @@ static void reweight_entity(struct cfs_r
enqueue_load_avg(cfs_rq, se);
if (se->on_rq) {
place_entity(cfs_rq, se, 0);
+ if (rel_vprot)
+ se->vprot = se->vruntime + vprot;
update_load_add(&cfs_rq->load, se->load.weight);
if (!curr)
__enqueue_entity(cfs_rq, se);
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 2/4] sched/eevdf: Update se->vprot in reweight_entity()
2026-01-30 9:34 ` [PATCH 2/4] sched/eevdf: Update se->vprot in reweight_entity() Peter Zijlstra
@ 2026-01-30 16:20 ` Vincent Guittot
0 siblings, 0 replies; 70+ messages in thread
From: Vincent Guittot @ 2026-01-30 16:20 UTC (permalink / raw)
To: Peter Zijlstra
Cc: mingo, juri.lelli, dietmar.eggemann, rostedt, bsegall, mgorman,
vschneid, linux-kernel, wangtao554, quzicheng, kprateek.nayak,
wuyun.abel, dsmythies, Zhang Qiao
On Fri, 30 Jan 2026 at 10:47, Peter Zijlstra <peterz@infradead.org> wrote:
>
> From: Wang Tao <wangtao554@huawei.com>
>
> In the EEVDF framework with Run-to-Parity protection, `se->vprot` is an
> independent variable defining the virtual protection timestamp.
>
> When `reweight_entity()` is called (e.g., via nice/renice), it performs
> the following actions to preserve Lag consistency:
> 1. Scales `se->vlag` based on the new weight.
> 2. Calls `place_entity()`, which recalculates `se->vruntime` based on
> the new weight and scaled lag.
>
> However, the current implementation fails to update `se->vprot`, leading
> to mismatches between the task's actual runtime and its expected duration.
>
> Fixes: 63304558ba5d ("sched/eevdf: Curb wakeup-preemption")
> Suggested-by: Zhang Qiao <zhangqiao22@huawei.com>
> Signed-off-by: Wang Tao <wangtao554@huawei.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
> Link: https://patch.msgid.link/20260120123113.3518950-1-wangtao554@huawei.com
> ---
> kernel/sched/fair.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -3790,6 +3790,8 @@ static void reweight_entity(struct cfs_r
> unsigned long weight)
> {
> bool curr = cfs_rq->curr == se;
> + bool rel_vprot = false;
> + u64 vprot;
>
> if (se->on_rq) {
> /* commit outstanding execution time */
> @@ -3797,6 +3799,11 @@ static void reweight_entity(struct cfs_r
> update_entity_lag(cfs_rq, se);
> se->deadline -= se->vruntime;
> se->rel_deadline = 1;
> + if (curr && protect_slice(se)) {
> + vprot = se->vprot - se->vruntime;
> + rel_vprot = true;
> + }
> +
> cfs_rq->nr_queued--;
> if (!curr)
> __dequeue_entity(cfs_rq, se);
> @@ -3812,6 +3819,9 @@ static void reweight_entity(struct cfs_r
> if (se->rel_deadline)
> se->deadline = div_s64(se->deadline * se->load.weight, weight);
>
> + if (rel_vprot)
> + vprot = div_s64(vprot * se->load.weight, weight);
> +
> update_load_set(&se->load, weight);
>
> do {
> @@ -3823,6 +3833,8 @@ static void reweight_entity(struct cfs_r
> enqueue_load_avg(cfs_rq, se);
> if (se->on_rq) {
> place_entity(cfs_rq, se, 0);
> + if (rel_vprot)
> + se->vprot = se->vruntime + vprot;
> update_load_add(&cfs_rq->load, se->load.weight);
> if (!curr)
> __enqueue_entity(cfs_rq, se);
>
>
^ permalink raw reply [flat|nested] 70+ messages in thread
* [PATCH 3/4] sched/fair: Increase weight bits for avg_vruntime
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
2026-01-30 9:34 ` [PATCH 1/4] sched/fair: Only set slice protection at pick time Peter Zijlstra
2026-01-30 9:34 ` [PATCH 2/4] sched/eevdf: Update se->vprot in reweight_entity() Peter Zijlstra
@ 2026-01-30 9:34 ` Peter Zijlstra
2026-01-30 9:34 ` [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag") Peter Zijlstra
` (5 subsequent siblings)
8 siblings, 0 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-01-30 9:34 UTC (permalink / raw)
To: mingo
Cc: peterz, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies
Due to the zero_vruntime patch, the deltas are now a lot smaller and
measurement with kernel-build and hackbench runs show about 54 bits
used.
This ensures avg_vruntime() tracks the full weight range, reducing
numerical artifacts in reweight and the like.
Also, lets keep the paranoid debug code around this time.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/debug.c | 14 ++++++++
kernel/sched/fair.c | 77 +++++++++++++++++++++++++++++++++++++++++-------
kernel/sched/features.h | 2 +
kernel/sched/sched.h | 3 +
4 files changed, 83 insertions(+), 13 deletions(-)
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -8,6 +8,7 @@
*/
#include <linux/debugfs.h>
#include <linux/nmi.h>
+#include <linux/log2.h>
#include "sched.h"
/*
@@ -790,10 +791,13 @@ static void print_rq(struct seq_file *m,
void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
{
- s64 left_vruntime = -1, zero_vruntime, right_vruntime = -1, left_deadline = -1, spread;
+ s64 left_vruntime = -1, right_vruntime = -1, left_deadline = -1, spread;
+ s64 zero_vruntime = -1, sum_w_vruntime = -1;
struct sched_entity *last, *first, *root;
struct rq *rq = cpu_rq(cpu);
+ unsigned int sum_shift;
unsigned long flags;
+ u64 sum_weight;
#ifdef CONFIG_FAIR_GROUP_SCHED
SEQ_printf(m, "\n");
@@ -814,6 +818,9 @@ void print_cfs_rq(struct seq_file *m, in
if (last)
right_vruntime = last->vruntime;
zero_vruntime = cfs_rq->zero_vruntime;
+ sum_w_vruntime = cfs_rq->sum_w_vruntime;
+ sum_weight = cfs_rq->sum_weight;
+ sum_shift = cfs_rq->sum_shift;
raw_spin_rq_unlock_irqrestore(rq, flags);
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "left_deadline",
@@ -822,6 +829,11 @@ void print_cfs_rq(struct seq_file *m, in
SPLIT_NS(left_vruntime));
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "zero_vruntime",
SPLIT_NS(zero_vruntime));
+ SEQ_printf(m, " .%-30s: %Ld (%d bits)\n", "sum_w_vruntime",
+ sum_w_vruntime, ilog2(abs(sum_w_vruntime)));
+ SEQ_printf(m, " .%-30s: %Lu\n", "sum_weight",
+ sum_weight);
+ SEQ_printf(m, " .%-30s: %u\n", "sum_shift", sum_shift);
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "avg_vruntime",
SPLIT_NS(avg_vruntime(cfs_rq)));
SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "right_vruntime",
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -650,15 +650,20 @@ static inline s64 entity_key(struct cfs_
* Since zero_vruntime closely tracks the per-task service, these
* deltas: (v_i - v0), will be in the order of the maximal (virtual) lag
* induced in the system due to quantisation.
- *
- * Also, we use scale_load_down() to reduce the size.
- *
- * As measured, the max (key * weight) value was ~44 bits for a kernel build.
*/
-static void
-sum_w_vruntime_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
+static inline unsigned long avg_vruntime_weight(struct cfs_rq *cfs_rq, unsigned long w)
+{
+#ifdef CONFIG_64BIT
+ if (cfs_rq->sum_shift)
+ w = max(2UL, w >> cfs_rq->sum_shift);
+#endif
+ return w;
+}
+
+static inline void
+__sum_w_vruntime_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- unsigned long weight = scale_load_down(se->load.weight);
+ unsigned long weight = avg_vruntime_weight(cfs_rq, se->load.weight);
s64 key = entity_key(cfs_rq, se);
cfs_rq->sum_w_vruntime += key * weight;
@@ -666,9 +671,59 @@ sum_w_vruntime_add(struct cfs_rq *cfs_rq
}
static void
+sum_w_vruntime_add_paranoid(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+ unsigned long weight;
+ s64 key, tmp;
+
+again:
+ weight = avg_vruntime_weight(cfs_rq, se->load.weight);
+ key = entity_key(cfs_rq, se);
+
+ if (check_mul_overflow(key, weight, &key))
+ goto overflow;
+
+ if (check_add_overflow(cfs_rq->sum_w_vruntime, key, &tmp))
+ goto overflow;
+
+ cfs_rq->sum_w_vruntime = tmp;
+ cfs_rq->sum_weight += weight;
+ return;
+
+overflow:
+ /*
+ * There's gotta be a limit -- if we're still failing at this point
+ * there's really nothing much to be done about things.
+ */
+ BUG_ON(cfs_rq->sum_shift >= 10);
+ cfs_rq->sum_shift++;
+
+ /*
+ * Note: \Sum (k_i * (w_i >> 1)) != (\Sum (k_i * w_i)) >> 1
+ */
+ cfs_rq->sum_w_vruntime = 0;
+ cfs_rq->sum_weight = 0;
+
+ for (struct rb_node *node = cfs_rq->tasks_timeline.rb_leftmost;
+ node; node = rb_next(node))
+ __sum_w_vruntime_add(cfs_rq, __node_2_se(node));
+
+ goto again;
+}
+
+static void
+sum_w_vruntime_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+ if (sched_feat(PARANOID_AVG))
+ return sum_w_vruntime_add_paranoid(cfs_rq, se);
+
+ __sum_w_vruntime_add(cfs_rq, se);
+}
+
+static void
sum_w_vruntime_sub(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
- unsigned long weight = scale_load_down(se->load.weight);
+ unsigned long weight = avg_vruntime_weight(cfs_rq, se->load.weight);
s64 key = entity_key(cfs_rq, se);
cfs_rq->sum_w_vruntime -= key * weight;
@@ -695,7 +750,7 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
long load = cfs_rq->sum_weight;
if (curr && curr->on_rq) {
- unsigned long weight = scale_load_down(curr->load.weight);
+ unsigned long weight = avg_vruntime_weight(cfs_rq, curr->load.weight);
avg += entity_key(cfs_rq, curr) * weight;
load += weight;
@@ -5170,9 +5225,9 @@ place_entity(struct cfs_rq *cfs_rq, stru
*/
load = cfs_rq->sum_weight;
if (curr && curr->on_rq)
- load += scale_load_down(curr->load.weight);
+ load += avg_vruntime_weight(cfs_rq, curr->load.weight);
- lag *= load + scale_load_down(se->load.weight);
+ lag *= load + avg_vruntime_weight(cfs_rq, se->load.weight);
if (WARN_ON_ONCE(!load))
load = 1;
lag = div_s64(lag, load);
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -58,6 +58,8 @@ SCHED_FEAT(CACHE_HOT_BUDDY, true)
SCHED_FEAT(DELAY_DEQUEUE, true)
SCHED_FEAT(DELAY_ZERO, true)
+SCHED_FEAT(PARANOID_AVG, false)
+
/*
* Allow wakeup-time preemption of the current task:
*/
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -679,8 +679,9 @@ struct cfs_rq {
s64 sum_w_vruntime;
u64 sum_weight;
-
u64 zero_vruntime;
+ unsigned int sum_shift;
+
#ifdef CONFIG_SCHED_CORE
unsigned int forceidle_seq;
u64 zero_vruntime_fi;
^ permalink raw reply [flat|nested] 70+ messages in thread* [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag")
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
` (2 preceding siblings ...)
2026-01-30 9:34 ` [PATCH 3/4] sched/fair: Increase weight bits for avg_vruntime Peter Zijlstra
@ 2026-01-30 9:34 ` Peter Zijlstra
2026-01-31 1:47 ` Zhang Qiao
2026-02-01 17:13 ` [PATCH 0/4] sched: Various reweight_entity() fixes Doug Smythies
` (4 subsequent siblings)
8 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-01-30 9:34 UTC (permalink / raw)
To: mingo
Cc: peterz, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies
Zicheng Qu reported that, because avg_vruntime() always includes
cfs_rq->curr, when ->on_rq, place_entity() doesn't work right.
Specifically, the lag scaling in place_entity() relies on
avg_vruntime() being the state *before* placement of the new entity.
However in this case avg_vruntime() will actually already include the
entity, which breaks things.
Also, Zicheng Qu argues that avg_vruntime should be invariant under
reweight. IOW commit 6d71a9c61604 ("sched/fair: Fix EEVDF entity
placement bug causing scheduling lag") was wrong!
The issue reported in 6d71a9c61604 could possibly be explained by
rounding artifacts -- notably the extreme weight '2' is outside of the
range of avg_vruntime/sum_w_vruntime, since that uses
scale_load_down(). By scaling vruntime by the real weight, but
accounting it in vruntime with a factor 1024 more, the average moves
significantly.
Tested by reverting 66951e4860d3 ("sched/fair: Fix update_cfs_group()
vs DELAY_DEQUEUE") and tracing vruntime and vlag figures again.
Reported-by: Zicheng Qu <quzicheng@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/fair.c | 154 +++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 129 insertions(+), 25 deletions(-)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -782,16 +782,21 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
*
* XXX could add max_slice to the augmented data to track this.
*/
-static void update_entity_lag(struct cfs_rq *cfs_rq, struct sched_entity *se)
+static s64 entity_lag(u64 avruntime, struct sched_entity *se)
{
s64 vlag, limit;
- WARN_ON_ONCE(!se->on_rq);
-
- vlag = avg_vruntime(cfs_rq) - se->vruntime;
+ vlag = avruntime - se->vruntime;
limit = calc_delta_fair(max_t(u64, 2*se->slice, TICK_NSEC), se);
- se->vlag = clamp(vlag, -limit, limit);
+ return clamp(vlag, -limit, limit);
+}
+
+static void update_entity_lag(struct cfs_rq *cfs_rq, struct sched_entity *se)
+{
+ WARN_ON_ONCE(!se->on_rq);
+
+ se->vlag = entity_lag(avg_vruntime(cfs_rq), se);
}
/*
@@ -3839,23 +3844,135 @@ dequeue_load_avg(struct cfs_rq *cfs_rq,
se_weight(se) * -se->avg.load_sum);
}
-static void place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags);
+static void rescale_entity(struct sched_entity *se, unsigned long weight,
+ u64 avruntime, bool rel_vprot)
+{
+ unsigned long old_weight = se->load.weight;
+
+ /*
+ * VRUNTIME
+ * --------
+ *
+ * COROLLARY #1: The virtual runtime of the entity needs to be
+ * adjusted if re-weight at !0-lag point.
+ *
+ * Proof: For contradiction assume this is not true, so we can
+ * re-weight without changing vruntime at !0-lag point.
+ *
+ * Weight VRuntime Avg-VRuntime
+ * before w v V
+ * after w' v' V'
+ *
+ * Since lag needs to be preserved through re-weight:
+ *
+ * lag = (V - v)*w = (V'- v')*w', where v = v'
+ * ==> V' = (V - v)*w/w' + v (1)
+ *
+ * Let W be the total weight of the entities before reweight,
+ * since V' is the new weighted average of entities:
+ *
+ * V' = (WV + w'v - wv) / (W + w' - w) (2)
+ *
+ * by using (1) & (2) we obtain:
+ *
+ * (WV + w'v - wv) / (W + w' - w) = (V - v)*w/w' + v
+ * ==> (WV-Wv+Wv+w'v-wv)/(W+w'-w) = (V - v)*w/w' + v
+ * ==> (WV - Wv)/(W + w' - w) + v = (V - v)*w/w' + v
+ * ==> (V - v)*W/(W + w' - w) = (V - v)*w/w' (3)
+ *
+ * Since we are doing at !0-lag point which means V != v, we
+ * can simplify (3):
+ *
+ * ==> W / (W + w' - w) = w / w'
+ * ==> Ww' = Ww + ww' - ww
+ * ==> W * (w' - w) = w * (w' - w)
+ * ==> W = w (re-weight indicates w' != w)
+ *
+ * So the cfs_rq contains only one entity, hence vruntime of
+ * the entity @v should always equal to the cfs_rq's weighted
+ * average vruntime @V, which means we will always re-weight
+ * at 0-lag point, thus breach assumption. Proof completed.
+ *
+ *
+ * COROLLARY #2: Re-weight does NOT affect weighted average
+ * vruntime of all the entities.
+ *
+ * Proof: According to corollary #1, Eq. (1) should be:
+ *
+ * (V - v)*w = (V' - v')*w'
+ * ==> v' = V' - (V - v)*w/w' (4)
+ *
+ * According to the weighted average formula, we have:
+ *
+ * V' = (WV - wv + w'v') / (W - w + w')
+ * = (WV - wv + w'(V' - (V - v)w/w')) / (W - w + w')
+ * = (WV - wv + w'V' - Vw + wv) / (W - w + w')
+ * = (WV + w'V' - Vw) / (W - w + w')
+ *
+ * ==> V'*(W - w + w') = WV + w'V' - Vw
+ * ==> V' * (W - w) = (W - w) * V (5)
+ *
+ * If the entity is the only one in the cfs_rq, then reweight
+ * always occurs at 0-lag point, so V won't change. Or else
+ * there are other entities, hence W != w, then Eq. (5) turns
+ * into V' = V. So V won't change in either case, proof done.
+ *
+ *
+ * So according to corollary #1 & #2, the effect of re-weight
+ * on vruntime should be:
+ *
+ * v' = V' - (V - v) * w / w' (4)
+ * = V - (V - v) * w / w'
+ * = V - vl * w / w'
+ * = V - vl'
+ */
+ se->vlag = div_s64(se->vlag * old_weight, weight);
+ if (avruntime)
+ se->vruntime = avruntime - se->vlag;
+
+ /*
+ * DEADLINE
+ * --------
+ *
+ * When the weight changes, the virtual time slope changes and
+ * we should adjust the relative virtual deadline accordingly.
+ *
+ * d' = v' + (d - v)*w/w'
+ * = V' - (V - v)*w/w' + (d - v)*w/w'
+ * = V - (V - v)*w/w' + (d - v)*w/w'
+ * = V + (d - V)*w/w'
+ */
+ if (se->rel_deadline) {
+ se->deadline = div_s64(se->deadline * old_weight, weight);
+ if (avruntime) {
+ se->rel_deadline = 0;
+ se->deadline += avruntime;
+ }
+ }
+
+ if (rel_vprot) {
+ se->vprot = div_s64(se->vprot * old_weight, weight);
+ if (avruntime)
+ se->vprot += avruntime;
+ }
+}
static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
unsigned long weight)
{
bool curr = cfs_rq->curr == se;
bool rel_vprot = false;
- u64 vprot;
+ u64 avruntime = 0;
if (se->on_rq) {
/* commit outstanding execution time */
update_curr(cfs_rq);
- update_entity_lag(cfs_rq, se);
- se->deadline -= se->vruntime;
+ avruntime = avg_vruntime(cfs_rq);
+ se->vlag = entity_lag(avruntime, se);
+ se->deadline -= avruntime;
se->rel_deadline = 1;
if (curr && protect_slice(se)) {
- vprot = se->vprot - se->vruntime;
+ se->vprot -= avruntime;
rel_vprot = true;
}
@@ -3866,30 +3983,17 @@ static void reweight_entity(struct cfs_r
}
dequeue_load_avg(cfs_rq, se);
- /*
- * Because we keep se->vlag = V - v_i, while: lag_i = w_i*(V - v_i),
- * we need to scale se->vlag when w_i changes.
- */
- se->vlag = div_s64(se->vlag * se->load.weight, weight);
- if (se->rel_deadline)
- se->deadline = div_s64(se->deadline * se->load.weight, weight);
-
- if (rel_vprot)
- vprot = div_s64(vprot * se->load.weight, weight);
+ rescale_entity(se, weight, avruntime, rel_vprot);
update_load_set(&se->load, weight);
do {
u32 divider = get_pelt_divider(&se->avg);
-
se->avg.load_avg = div_u64(se_weight(se) * se->avg.load_sum, divider);
} while (0);
enqueue_load_avg(cfs_rq, se);
if (se->on_rq) {
- place_entity(cfs_rq, se, 0);
- if (rel_vprot)
- se->vprot = se->vruntime + vprot;
update_load_add(&cfs_rq->load, se->load.weight);
if (!curr)
__enqueue_entity(cfs_rq, se);
@@ -5247,7 +5351,7 @@ place_entity(struct cfs_rq *cfs_rq, stru
se->vruntime = vruntime - lag;
- if (se->rel_deadline) {
+ if (sched_feat(PLACE_REL_DEADLINE) && se->rel_deadline) {
se->deadline += se->vruntime;
se->rel_deadline = 0;
return;
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag")
2026-01-30 9:34 ` [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag") Peter Zijlstra
@ 2026-01-31 1:47 ` Zhang Qiao
2026-01-31 15:21 ` Peter Zijlstra
0 siblings, 1 reply; 70+ messages in thread
From: Zhang Qiao @ 2026-01-31 1:47 UTC (permalink / raw)
To: Peter Zijlstra, mingo
Cc: juri.lelli, vincent.guittot, dietmar.eggemann, rostedt, bsegall,
mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies, Hui Tang
Hi, peter
在 2026/1/30 17:34, Peter Zijlstra 写道:
> Zicheng Qu reported that, because avg_vruntime() always includes
> cfs_rq->curr, when ->on_rq, place_entity() doesn't work right.
>
> Specifically, the lag scaling in place_entity() relies on
> avg_vruntime() being the state *before* placement of the new entity.
> However in this case avg_vruntime() will actually already include the
> entity, which breaks things.
>
> Also, Zicheng Qu argues that avg_vruntime should be invariant under
> reweight. IOW commit 6d71a9c61604 ("sched/fair: Fix EEVDF entity
> placement bug causing scheduling lag") was wrong!
>
> The issue reported in 6d71a9c61604 could possibly be explained by
> rounding artifacts -- notably the extreme weight '2' is outside of the
> range of avg_vruntime/sum_w_vruntime, since that uses
> scale_load_down(). By scaling vruntime by the real weight, but
> accounting it in vruntime with a factor 1024 more, the average moves
> significantly.
>
> Tested by reverting 66951e4860d3 ("sched/fair: Fix update_cfs_group()
> vs DELAY_DEQUEUE") and tracing vruntime and vlag figures again.
>
> Reported-by: Zicheng Qu <quzicheng@huawei.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
> kernel/sched/fair.c | 154 +++++++++++++++++++++++++++++++++++++++++++---------
> 1 file changed, 129 insertions(+), 25 deletions(-)
>
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -782,16 +782,21 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
> *
> * XXX could add max_slice to the augmented data to track this.
> */
> -static void update_entity_lag(struct cfs_rq *cfs_rq, struct sched_entity *se)
> +static s64 entity_lag(u64 avruntime, struct sched_entity *se)
> {
> s64 vlag, limit;
>
> - WARN_ON_ONCE(!se->on_rq);
> -
> - vlag = avg_vruntime(cfs_rq) - se->vruntime;
> + vlag = avruntime - se->vruntime;
> limit = calc_delta_fair(max_t(u64, 2*se->slice, TICK_NSEC), se);
>
> - se->vlag = clamp(vlag, -limit, limit);
> + return clamp(vlag, -limit, limit);
> +}
> +
> +static void update_entity_lag(struct cfs_rq *cfs_rq, struct sched_entity *se)
> +{
> + WARN_ON_ONCE(!se->on_rq);
> +
> + se->vlag = entity_lag(avg_vruntime(cfs_rq), se);
> }
>
> /*
> @@ -3839,23 +3844,135 @@ dequeue_load_avg(struct cfs_rq *cfs_rq,
> se_weight(se) * -se->avg.load_sum);
> }
>
> -static void place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags);
> +static void rescale_entity(struct sched_entity *se, unsigned long weight,
> + u64 avruntime, bool rel_vprot)
> +{
> + unsigned long old_weight = se->load.weight;
> +
> + /*
> + * VRUNTIME
> + * --------
> + *
> + * COROLLARY #1: The virtual runtime of the entity needs to be
> + * adjusted if re-weight at !0-lag point.
> + *
> + * Proof: For contradiction assume this is not true, so we can
> + * re-weight without changing vruntime at !0-lag point.
> + *
> + * Weight VRuntime Avg-VRuntime
> + * before w v V
> + * after w' v' V'
> + *
> + * Since lag needs to be preserved through re-weight:
> + *
> + * lag = (V - v)*w = (V'- v')*w', where v = v'
> + * ==> V' = (V - v)*w/w' + v (1)
> + *
> + * Let W be the total weight of the entities before reweight,
> + * since V' is the new weighted average of entities:
> + *
> + * V' = (WV + w'v - wv) / (W + w' - w) (2)
> + *
> + * by using (1) & (2) we obtain:
> + *
> + * (WV + w'v - wv) / (W + w' - w) = (V - v)*w/w' + v
> + * ==> (WV-Wv+Wv+w'v-wv)/(W+w'-w) = (V - v)*w/w' + v
> + * ==> (WV - Wv)/(W + w' - w) + v = (V - v)*w/w' + v
> + * ==> (V - v)*W/(W + w' - w) = (V - v)*w/w' (3)
> + *
> + * Since we are doing at !0-lag point which means V != v, we
> + * can simplify (3):
> + *
> + * ==> W / (W + w' - w) = w / w'
> + * ==> Ww' = Ww + ww' - ww
> + * ==> W * (w' - w) = w * (w' - w)
> + * ==> W = w (re-weight indicates w' != w)
> + *
> + * So the cfs_rq contains only one entity, hence vruntime of
> + * the entity @v should always equal to the cfs_rq's weighted
> + * average vruntime @V, which means we will always re-weight
> + * at 0-lag point, thus breach assumption. Proof completed.
> + *
> + *
> + * COROLLARY #2: Re-weight does NOT affect weighted average
> + * vruntime of all the entities.
> + *
> + * Proof: According to corollary #1, Eq. (1) should be:
> + *
> + * (V - v)*w = (V' - v')*w'
> + * ==> v' = V' - (V - v)*w/w' (4)
> + *
> + * According to the weighted average formula, we have:
> + *
> + * V' = (WV - wv + w'v') / (W - w + w')
> + * = (WV - wv + w'(V' - (V - v)w/w')) / (W - w + w')
> + * = (WV - wv + w'V' - Vw + wv) / (W - w + w')
> + * = (WV + w'V' - Vw) / (W - w + w')
> + *
> + * ==> V'*(W - w + w') = WV + w'V' - Vw
> + * ==> V' * (W - w) = (W - w) * V (5)
> + *
> + * If the entity is the only one in the cfs_rq, then reweight
> + * always occurs at 0-lag point, so V won't change. Or else
> + * there are other entities, hence W != w, then Eq. (5) turns
> + * into V' = V. So V won't change in either case, proof done.
> + *
> + *
> + * So according to corollary #1 & #2, the effect of re-weight
> + * on vruntime should be:
> + *
> + * v' = V' - (V - v) * w / w' (4)
> + * = V - (V - v) * w / w'
> + * = V - vl * w / w'
> + * = V - vl'
> + */
> + se->vlag = div_s64(se->vlag * old_weight, weight);
> + if (avruntime)
> + se->vruntime = avruntime - se->vlag;
> +
> + /*
> + * DEADLINE
> + * --------
> + *
> + * When the weight changes, the virtual time slope changes and
> + * we should adjust the relative virtual deadline accordingly.
> + *
> + * d' = v' + (d - v)*w/w'
> + * = V' - (V - v)*w/w' + (d - v)*w/w'
> + * = V - (V - v)*w/w' + (d - v)*w/w'
> + * = V + (d - V)*w/w'
> + */
> + if (se->rel_deadline) {
> + se->deadline = div_s64(se->deadline * old_weight, weight);
> + if (avruntime) {
> + se->rel_deadline = 0;
> + se->deadline += avruntime;
> + }
> + }
> +
> + if (rel_vprot) {
> + se->vprot = div_s64(se->vprot * old_weight, weight);
> + if (avruntime)
> + se->vprot += avruntime;
> + }
> +}
>
> static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
> unsigned long weight)
> {
> bool curr = cfs_rq->curr == se;
> bool rel_vprot = false;
> - u64 vprot;
> + u64 avruntime = 0;
>
> if (se->on_rq) {
> /* commit outstanding execution time */
> update_curr(cfs_rq);
> - update_entity_lag(cfs_rq, se);
> - se->deadline -= se->vruntime;
> + avruntime = avg_vruntime(cfs_rq);
> + se->vlag = entity_lag(avruntime, se);
vlag is updated here. Considering vlag and vprot share the same union, updating
vlag will overwrite vprot. Is it right to call protect_slice() (which use vprot)
after this update?
> + se->deadline -= avruntime;
> se->rel_deadline = 1;
> if (curr && protect_slice(se)) {
> - vprot = se->vprot - se->vruntime;
> + se->vprot -= avruntime;
> rel_vprot = true;
> }
>
> @@ -3866,30 +3983,17 @@ static void reweight_entity(struct cfs_r
> }
> dequeue_load_avg(cfs_rq, se);
>
> - /*
> - * Because we keep se->vlag = V - v_i, while: lag_i = w_i*(V - v_i),
> - * we need to scale se->vlag when w_i changes.
> - */
> - se->vlag = div_s64(se->vlag * se->load.weight, weight);
> - if (se->rel_deadline)
> - se->deadline = div_s64(se->deadline * se->load.weight, weight);
> -
> - if (rel_vprot)
> - vprot = div_s64(vprot * se->load.weight, weight);
> + rescale_entity(se, weight, avruntime, rel_vprot);
>
> update_load_set(&se->load, weight);
>
> do {
> u32 divider = get_pelt_divider(&se->avg);
> -
> se->avg.load_avg = div_u64(se_weight(se) * se->avg.load_sum, divider);
> } while (0);
>
> enqueue_load_avg(cfs_rq, se);
> if (se->on_rq) {
> - place_entity(cfs_rq, se, 0);
> - if (rel_vprot)
> - se->vprot = se->vruntime + vprot;
> update_load_add(&cfs_rq->load, se->load.weight);
> if (!curr)
> __enqueue_entity(cfs_rq, se);
> @@ -5247,7 +5351,7 @@ place_entity(struct cfs_rq *cfs_rq, stru
>
> se->vruntime = vruntime - lag;
>
> - if (se->rel_deadline) {
> + if (sched_feat(PLACE_REL_DEADLINE) && se->rel_deadline) {
> se->deadline += se->vruntime;
> se->rel_deadline = 0;
> return;
>
>
>
> .
>
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag")
2026-01-31 1:47 ` Zhang Qiao
@ 2026-01-31 15:21 ` Peter Zijlstra
2026-02-02 9:12 ` Peter Zijlstra
0 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-01-31 15:21 UTC (permalink / raw)
To: Zhang Qiao
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies, Hui Tang
On Sat, Jan 31, 2026 at 09:47:07AM +0800, Zhang Qiao wrote:
> > if (se->on_rq) {
> > /* commit outstanding execution time */
> > update_curr(cfs_rq);
> > - update_entity_lag(cfs_rq, se);
> > - se->deadline -= se->vruntime;
> > + avruntime = avg_vruntime(cfs_rq);
> > + se->vlag = entity_lag(avruntime, se);
>
>
> vlag is updated here. Considering vlag and vprot share the same union, updating
> vlag will overwrite vprot. Is it right to call protect_slice() (which use vprot)
> after this update?
Oh you are quite right; I'm sure Ingo had a patch removing that union,
but clearly that's not been merged yet.
Sorry about that mistake; I'll make a new version on Monday.
Thanks!
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag")
2026-01-31 15:21 ` Peter Zijlstra
@ 2026-02-02 9:12 ` Peter Zijlstra
2026-02-02 9:24 ` Peter Zijlstra
2026-02-02 11:23 ` Zhang Qiao
0 siblings, 2 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-02 9:12 UTC (permalink / raw)
To: Zhang Qiao
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies, Hui Tang
On Sat, Jan 31, 2026 at 04:21:39PM +0100, Peter Zijlstra wrote:
> On Sat, Jan 31, 2026 at 09:47:07AM +0800, Zhang Qiao wrote:
>
> > > if (se->on_rq) {
> > > /* commit outstanding execution time */
> > > update_curr(cfs_rq);
> > > - update_entity_lag(cfs_rq, se);
> > > - se->deadline -= se->vruntime;
> > > + avruntime = avg_vruntime(cfs_rq);
> > > + se->vlag = entity_lag(avruntime, se);
> >
> >
> > vlag is updated here. Considering vlag and vprot share the same union, updating
> > vlag will overwrite vprot. Is it right to call protect_slice() (which use vprot)
> > after this update?
>
> Oh you are quite right; I'm sure Ingo had a patch removing that union,
> but clearly that's not been merged yet.
>
> Sorry about that mistake; I'll make a new version on Monday.
After looking at things, I think the best option is to simply remove
that union.
The thing is, I can fix reweight to respect this union, but there are
more problems, notably the sched_change pattern will not only call
put_prev_task/set_next_task, it will actually dequeue/enqueue the thing
and therefore 'temporarily' use the vlag field, destroying the vprot
value.
And yes, we can fix all that, but I'm thinking that at that point the
union is more trouble than its worth.
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag")
2026-02-02 9:12 ` Peter Zijlstra
@ 2026-02-02 9:24 ` Peter Zijlstra
2026-02-02 11:23 ` Zhang Qiao
1 sibling, 0 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-02 9:24 UTC (permalink / raw)
To: Zhang Qiao
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies, Hui Tang
On Mon, Feb 02, 2026 at 10:12:34AM +0100, Peter Zijlstra wrote:
> On Sat, Jan 31, 2026 at 04:21:39PM +0100, Peter Zijlstra wrote:
> > On Sat, Jan 31, 2026 at 09:47:07AM +0800, Zhang Qiao wrote:
> >
> > > > if (se->on_rq) {
> > > > /* commit outstanding execution time */
> > > > update_curr(cfs_rq);
> > > > - update_entity_lag(cfs_rq, se);
> > > > - se->deadline -= se->vruntime;
> > > > + avruntime = avg_vruntime(cfs_rq);
> > > > + se->vlag = entity_lag(avruntime, se);
> > >
> > >
> > > vlag is updated here. Considering vlag and vprot share the same union, updating
> > > vlag will overwrite vprot. Is it right to call protect_slice() (which use vprot)
> > > after this update?
> >
> > Oh you are quite right; I'm sure Ingo had a patch removing that union,
> > but clearly that's not been merged yet.
> >
> > Sorry about that mistake; I'll make a new version on Monday.
>
> After looking at things, I think the best option is to simply remove
> that union.
>
> The thing is, I can fix reweight to respect this union, but there are
> more problems, notably the sched_change pattern will not only call
> put_prev_task/set_next_task, it will actually dequeue/enqueue the thing
> and therefore 'temporarily' use the vlag field, destroying the vprot
> value.
>
> And yes, we can fix all that, but I'm thinking that at that point the
> union is more trouble than its worth.
>
And its already gone -- I managed to consistently look at the wrong
tree. So all should be good.
---
commit 80390ead2080071cbd6f427ff8deb94d10a4a50f
Author: Ingo Molnar <mingo@kernel.org>
Date: Wed Nov 26 05:31:28 2025 +0100
sched/fair: Separate se->vlag from se->vprot
There's no real space concerns here and keeping these fields
in a union makes reading (and tracing) the scheduler code harder.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/20251201064647.1851919-4-mingo@kernel.org
diff --git a/include/linux/sched.h b/include/linux/sched.h
index d395f2810fac..bf96a7d595e2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -586,15 +586,10 @@ struct sched_entity {
u64 sum_exec_runtime;
u64 prev_sum_exec_runtime;
u64 vruntime;
- union {
- /*
- * When !@on_rq this field is vlag.
- * When cfs_rq->curr == se (which implies @on_rq)
- * this field is vprot. See protect_slice().
- */
- s64 vlag;
- u64 vprot;
- };
+ /* Approximated virtual lag: */
+ s64 vlag;
+ /* 'Protected' deadline, to give out minimum quantums: */
+ u64 vprot;
u64 slice;
u64 nr_migrations;
^ permalink raw reply related [flat|nested] 70+ messages in thread* Re: [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag")
2026-02-02 9:12 ` Peter Zijlstra
2026-02-02 9:24 ` Peter Zijlstra
@ 2026-02-02 11:23 ` Zhang Qiao
1 sibling, 0 replies; 70+ messages in thread
From: Zhang Qiao @ 2026-02-02 11:23 UTC (permalink / raw)
To: Peter Zijlstra
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies, Hui Tang
在 2026/2/2 17:12, Peter Zijlstra 写道:
> On Sat, Jan 31, 2026 at 04:21:39PM +0100, Peter Zijlstra wrote:
>> On Sat, Jan 31, 2026 at 09:47:07AM +0800, Zhang Qiao wrote:
>>
>>>> if (se->on_rq) {
>>>> /* commit outstanding execution time */
>>>> update_curr(cfs_rq);
>>>> - update_entity_lag(cfs_rq, se);
>>>> - se->deadline -= se->vruntime;
>>>> + avruntime = avg_vruntime(cfs_rq);
>>>> + se->vlag = entity_lag(avruntime, se);
>>>
>>>
>>> vlag is updated here. Considering vlag and vprot share the same union, updating
>>> vlag will overwrite vprot. Is it right to call protect_slice() (which use vprot)
>>> after this update?
>>
>> Oh you are quite right; I'm sure Ingo had a patch removing that union,
>> but clearly that's not been merged yet.
>>
>> Sorry about that mistake; I'll make a new version on Monday.
>
> After looking at things, I think the best option is to simply remove
> that union.
>
Agreed. The union makes the code logic overly complex and error-prone.
> The thing is, I can fix reweight to respect this union, but there are
> more problems, notably the sched_change pattern will not only call
> put_prev_task/set_next_task, it will actually dequeue/enqueue the thing
> and therefore 'temporarily' use the vlag field, destroying the vprot
> value.
>
> And yes, we can fix all that, but I'm thinking that at that point the
> union is more trouble than its worth.
>
>
> .
>
^ permalink raw reply [flat|nested] 70+ messages in thread
* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
` (3 preceding siblings ...)
2026-01-30 9:34 ` [PATCH 4/4] sched/fair: Revert 6d71a9c61604 ("sched/fair: Fix EEVDF entity placement bug causing scheduling lag") Peter Zijlstra
@ 2026-02-01 17:13 ` Doug Smythies
2026-02-03 6:45 ` K Prateek Nayak
` (3 subsequent siblings)
8 siblings, 0 replies; 70+ messages in thread
From: Doug Smythies @ 2026-02-01 17:13 UTC (permalink / raw)
To: 'Peter Zijlstra'
Cc: juri.lelli, vincent.guittot, dietmar.eggemann, rostedt, bsegall,
mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, Doug Smythies, mingo
Hi Peter,
Thank you for including me on this set of emails.
I assume I was copied on this patch set because I reported an issue a year ago,
and I see patch 4 of 4 reverts the fix from that time.
I also note that there is a pending update to patch 4 of 4. I will re-test then.
On 2026.01.30 01:35 Peter Zijlstra wrote:
> Two issues related to reweight_entity() were raised; poking at all that got me
> these patches.
>
> They're in queue.git/sched/core
Thanks. I tried to apply them to kernel 6.19-rc5, but patch 3 of 4 would not apply.
It took me awhile to figure out what you meant but got there in the end.
> and I spend most of yesterday staring at traces
> trying to find anything wrong. So far, so good.
>
> Please test.
Happy to.
There were 2 issues raised a year ago: One was extremely long CPU migration
times under specific conditions, thousands of times longer than reasonable;
The second was similar, but much much less in magnitude. The second issue
was hidden by the first but became apparent once the first was fixed.
For more background, readers are referred to the long email thread [1].
Testing of this patch set:
For those that don't want to read: Summary: all good.
The main diagnostic tool used here is turbostat, where the issues are shown via
anomalies in the time between samples. The test setup is an otherwise
very idle system with a 100.0% load applied. Command used:
sudo turbostat --quiet --Summary --show Busy%,Bzy_MHz,IRQ,PkgWatt,PkgTmp,TSC_MHz,Time_Of_Day_Seconds,usec --interval 1 --out
/dev/shm/turbo.log
The data is post processed and a histogram of the times between samples is created. 1 millisecond per histogram bin.
Step 1: Confirm where we left off a year ago:
The exact same kernel from a year ago, that we ended up happy with, was used.
doug@s19:~/tmp/peterz/6.19/turbo$ cat 613.his
Kernel: 6.13.0-stock
gov: powersave
HWP: enabled
1.000000, 23195
1.001000, 10897
1.002000, 49
1.003000, 23
1.004000, 21
1.005000, 9
Total: 34194 : Total >= 10 mSec: 0 ( 0.00 percent)
So, over 9 hours and never a nominal sample time exceeded by over 5 milliseconds.
Very good.
Step 2: Take a baseline sample before this patch set:
Mainline kernel 6.19-rc1 was used:
doug@s19:~/tmp/peterz/6.19/turbo$ cat rc1.his
Kernel: 6.19.0-rc1-stock
gov: powersave
HWP: enabled
1.000000, 19509
1.001000, 10430
1.002000, 32
1.003000, 19
1.004000, 24
1.005000, 13
1.006000, 9
1.007000, 4
1.008000, 3
1.009000, 4
1.010000, 6
1.011000, 2
1.012000, 1
1.013000, 4
1.014000, 10
1.015000, 10
1.016000, 7
1.017000, 10
1.018000, 20
1.019000, 12
1.020000, 5
1.021000, 3
1.022000, 1
1.023000, 2
1.024000, 2 <<< Clamped. Actually 26 and 25 milliseconds
Total: 30142 : Total >= 10 mSec: 95 ( 0.32 percent)
What!!!
Over 8 hours.
It seems something has regressed over the last year.
Our threshold of 10 milliseconds was rather arbitrary.
Step 3: This patch set and from Peter's git tree:
doug@s19:~/tmp/peterz/6.19/turbo$ cat 02.his
kernel: 6.19.0-rc1-pz
gov: powersave
HWP: enabled
1.000000, 19139
1.001000, 9532
1.002000, 19
1.003000, 17
1.004000, 8
1.005000, 3
1.006000, 2
1.009000, 1
Total: 28721 : Total >= 10 mSec: 0 ( 0.00 percent)
Just about 8 hours.
Never a time >= our arbitrary threshold of 10 milliseconds.
So, good.
I will redo this test with the revised patch 4 of 4 when it is available.
... Doug
[1] https://lore.kernel.org/lkml/005f01db5a44$3bb698e0$b323caa0$@telus.net/
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
` (4 preceding siblings ...)
2026-02-01 17:13 ` [PATCH 0/4] sched: Various reweight_entity() fixes Doug Smythies
@ 2026-02-03 6:45 ` K Prateek Nayak
2026-02-03 11:11 ` Peter Zijlstra
2026-02-14 7:20 ` Shubhang Kaushik
` (2 subsequent siblings)
8 siblings, 1 reply; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-03 6:45 UTC (permalink / raw)
To: Peter Zijlstra, mingo
Cc: juri.lelli, vincent.guittot, dietmar.eggemann, rostedt, bsegall,
mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
Hello Peter,
On 1/30/2026 3:04 PM, Peter Zijlstra wrote:
> Two issues related to reweight_entity() were raised; poking at all that got me
> these patches.
>
> They're in queue.git/sched/core and I spend most of yesterday staring at traces
> trying to find anything wrong. So far, so good.
>
> Please test.
I put this on top of tip:sched/urgent + tip:sched/core which contains Ingo's
cleanup of removing the union and at some point in the benchmark run I hit:
BUG: kernel NULL pointer dereference, address: 0000000000000051
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD c153802067 P4D c1750e7067 PUD c16067e067 PMD 0
Oops: Oops: 0000 [#1] SMP NOPTI
CPU: 200 UID: 1000 PID: 92850 Comm: schbench Not tainted 6.19.0-rc6-peterz-eevdf-fix+ #4 PREEMPT(full)
Hardware name: ... (Zen4c server)
RIP: 0010:pick_task_fair+0x3c/0x130
Code: ...
RSP: 0000:ff5cc03f25ecfd58 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ff3087d6eb032380 RCX: 00000000056ae402
RDX: fffe78b16a6ed620 RSI: fffe790e92f4c046 RDI: 00027caa24e6c3ee
RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000002
R10: 0000086bfb248f00 R11: 0000000000000438 R12: ff3087d6eb032480
R13: ff5cc03f25ecfea0 R14: ff3087d6eb032380 R15: ff3087d6eb032380
FS: 00007f176438a640(0000) GS:ff3087d73d0e2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000051 CR3: 000000c0d275c048 CR4: 0000000000f71ef0
PKRU: 55555554
Call Trace:
<TASK>
pick_next_task_fair+0x46/0x7b0
? task_tick_fair+0xf1/0x8b0
? perf_event_task_tick+0x5e/0xc0
__pick_next_task+0x41/0x1d0
__schedule+0x26e/0x17a0
? srso_alias_return_thunk+0x5/0xfbef5
? timerqueue_add+0x9f/0xc0
? __hrtimer_run_queues+0x139/0x240
? ktime_get+0x3f/0xf0
? srso_alias_return_thunk+0x5/0xfbef5
? srso_alias_return_thunk+0x5/0xfbef5
? srso_alias_return_thunk+0x5/0xfbef5
? clockevents_program_event+0xaa/0x100
schedule+0x27/0xd0
irqentry_exit+0x2a8/0x610
? srso_alias_return_thunk+0x5/0xfbef5
? __irq_exit_rcu+0x3f/0xf0
asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0033:0x7f17f2498e58
Code: ...
RSP: 002b:00007f1764389d48 EFLAGS: 00000202
RAX: 0000000000000010 RBX: 00000000000000c8 RCX: 00007f17f24e57f8
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000014cd2820
RBP: 0000000014cd2820 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f1764389e00
R13: 00007f176439fed0 R14: 0000000000002a40 R15: 00007f17b414c778
</TASK>
Modules linked in: ...
CR2: 0000000000000051
---[ end trace 0000000000000000 ]---
RIP points to "se->sched_delayed" dereference in pick_task_fair():
$ scripts/faddr2line vmlinux pick_task_fair+0x3c/0x130
pick_task_fair+0x3c/0x130:
pick_next_entity at kernel/sched/fair.c:5648
(inlined by) pick_task_fair at kernel/sched/fair.c:9061
$ sed -n '5645,5651p' kernel/sched/fair.c
struct sched_entity *se;
se = pick_eevdf(cfs_rq);
if (se->sched_delayed) {
dequeue_entities(rq, se, DEQUEUE_SLEEP | DEQUEUE_DELAYED);
/*
* Must not reference @se again, see __block_task().
so something went sideways with the avg_vruntime calculation I presume.
I'm rerunning with the PARANOID_AVG feat now.
Just re-running the particular schbench variant hasn't crashed the kernel
in the half hour it has been running so I've re-triggered the same set of
benchmarks to see if flipping PARANOID_AVG makes any difference.
If you have a debug patch somewhere that you would like data on this run
from, please do let me know, else I plan on capturing the rq state at
the time of crash (cfs_rq walk, dumping all the vruntimes of all the
queued entities).
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-03 6:45 ` K Prateek Nayak
@ 2026-02-03 11:11 ` Peter Zijlstra
2026-02-03 12:19 ` K Prateek Nayak
0 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-03 11:11 UTC (permalink / raw)
To: K Prateek Nayak
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
On Tue, Feb 03, 2026 at 12:15:56PM +0530, K Prateek Nayak wrote:
> Hello Peter,
>
> On 1/30/2026 3:04 PM, Peter Zijlstra wrote:
> > Two issues related to reweight_entity() were raised; poking at all that got me
> > these patches.
> >
> > They're in queue.git/sched/core and I spend most of yesterday staring at traces
> > trying to find anything wrong. So far, so good.
> >
> > Please test.
>
> I put this on top of tip:sched/urgent + tip:sched/core which contains Ingo's
> cleanup of removing the union and at some point in the benchmark run I hit:
>
> BUG: kernel NULL pointer dereference, address: 0000000000000051
:-(
>
> so something went sideways with the avg_vruntime calculation I presume.
> I'm rerunning with the PARANOID_AVG feat now.
>
> Just re-running the particular schbench variant hasn't crashed the kernel
> in the half hour it has been running so I've re-triggered the same set of
> benchmarks to see if flipping PARANOID_AVG makes any difference.
If you run with PARANOID_AVG, the condition ends up visible as:
grep shift /debug/sched/debug
If any of the fields are !0, you tripped an overflow.
Once its !0, you can't get it back to 0 (except perhaps if its cgroup
things, in which case you can destroy and re-create the cgroups I
suppose) other than reboot.
Anyway, if you can reproduce without PARANOID_AVG (or indeed have
tripped overflow) could you share the specific schbench invocation you
used?
I'm not sure I have valuable tracing patches, I just stick random
trace_printk()s in.
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-03 11:11 ` Peter Zijlstra
@ 2026-02-03 12:19 ` K Prateek Nayak
2026-02-03 16:36 ` Doug Smythies
` (2 more replies)
0 siblings, 3 replies; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-03 12:19 UTC (permalink / raw)
To: Peter Zijlstra
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
Hello Peter,
On 2/3/2026 4:41 PM, Peter Zijlstra wrote:
> On Tue, Feb 03, 2026 at 12:15:56PM +0530, K Prateek Nayak wrote:
>> Hello Peter,
>>
>> On 1/30/2026 3:04 PM, Peter Zijlstra wrote:
>>> Two issues related to reweight_entity() were raised; poking at all that got me
>>> these patches.
>>>
>>> They're in queue.git/sched/core and I spend most of yesterday staring at traces
>>> trying to find anything wrong. So far, so good.
>>>
>>> Please test.
>>
>> I put this on top of tip:sched/urgent + tip:sched/core which contains Ingo's
>> cleanup of removing the union and at some point in the benchmark run I hit:
>>
>> BUG: kernel NULL pointer dereference, address: 0000000000000051
>
> :-(
>
>>
>> so something went sideways with the avg_vruntime calculation I presume.
>> I'm rerunning with the PARANOID_AVG feat now.
>>
>> Just re-running the particular schbench variant hasn't crashed the kernel
>> in the half hour it has been running so I've re-triggered the same set of
>> benchmarks to see if flipping PARANOID_AVG makes any difference.
>
> If you run with PARANOID_AVG, the condition ends up visible as:
>
> grep shift /debug/sched/debug
>
> If any of the fields are !0, you tripped an overflow.
Yup I see a few !0 values. Some inching closer to the BUG_ON()
grep "shift.*: [^0]$" /sys/kernel/debug/sched/debug
.sum_shift : 4
.sum_shift : 3
.sum_shift : 5
.sum_shift : 1
.sum_shift : 2
.sum_shift : 3
>
> Once its !0, you can't get it back to 0 (except perhaps if its cgroup
> things, in which case you can destroy and re-create the cgroups I
> suppose) other than reboot.
>
> Anyway, if you can reproduce without PARANOID_AVG (or indeed have
> tripped overflow) could you share the specific schbench invocation you
> used?
This trips when I'm running a (very) old version of schbench at commit
e4aa540 ("Make sure rps isn't zero in auto_rps mode.")
I'm running the following on a 512 CPU server:
#!/bin/bash
DIR=$1
MESSENGERS=1
MAX_ITERS=2
SCHBENCH=./schbench
for i in 1 2 4 8 16 32 64 128 256 512 768 1024;
do
THISDIR=$DIR/$i-workers
if [ ! -d $THISDIR ]
then
mkdir -p $THISDIR
fi
for j in `seq 0 $MAX_ITERS`
do
echo "===== Worker $i : Iter $j ======";
$SCHBENCH -m $MESSENGERS -t $i |& tee $THISDIR/iter-$j.log;
sleep 2
done
done
Fails when it is running with 768 workers. Standalone runs didn't
fail - have to run a cumulative runner that runs sched-messaging,
stream, tbench, netperf, first before running schbench :-(
>
> I'm not sure I have valuable tracing patches, I just stick random
> trace_printk()s in.
I'll plop those in and update once the I get a log for sum_shift++.
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-03 12:19 ` K Prateek Nayak
@ 2026-02-03 16:36 ` Doug Smythies
2026-02-10 18:13 ` Peter Zijlstra
2026-02-04 10:15 ` K Prateek Nayak
2026-02-04 10:44 ` Peter Zijlstra
2 siblings, 1 reply; 70+ messages in thread
From: Doug Smythies @ 2026-02-03 16:36 UTC (permalink / raw)
To: 'K Prateek Nayak', 'Peter Zijlstra'
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, Doug Smythies
[-- Attachment #1: Type: text/plain, Size: 2922 bytes --]
Hi All,
On 2026.02.03 04:19 K Prateek Nayak wrote:
> On 2/3/2026 4:41 PM, Peter Zijlstra wrote:
>> On Tue, Feb 03, 2026 at 12:15:56PM +0530, K Prateek Nayak wrote:
>>> On 1/30/2026 3:04 PM, Peter Zijlstra wrote:
>>>> Two issues related to reweight_entity() were raised; poking at all that got me
>>>> these patches.
>>>>
>>>> They're in queue.git/sched/core and I spend most of yesterday staring at traces
>>>> trying to find anything wrong. So far, so good.
>>>>
>>>> Please test.
>>>
>>> I put this on top of tip:sched/urgent + tip:sched/core which contains Ingo's
>>> cleanup of removing the union and at some point in the benchmark run I hit:
>>>
>>> BUG: kernel NULL pointer dereference, address: 0000000000000051
... snip ...
> This trips when I'm running a (very) old version of schbench at commit
> e4aa540 ("Make sure rps isn't zero in auto_rps mode.")
>
> I'm running the following on a 512 CPU server:
>
> #!/bin/bash
>
> DIR=$1
> MESSENGERS=1
> MAX_ITERS=2
> SCHBENCH=./schbench
>
> for i in 1 2 4 8 16 32 64 128 256 512 768 1024;
> do
> THISDIR=$DIR/$i-workers
> if [ ! -d $THISDIR ]
> then
> mkdir -p $THISDIR
> fi
> for j in `seq 0 $MAX_ITERS`
> do
> echo "===== Worker $i : Iter $j ======";
> $SCHBENCH -m $MESSENGERS -t $i |& tee $THISDIR/iter-$j.log;
> sleep 2
> done
> done
>
> Fails when it is running with 768 workers. Standalone runs didn't
> fail - have to run a cumulative runner that runs sched-messaging,
> stream, tbench, netperf, first before running schbench :-(
Further to my email from the other day, where all was good [1],
I have continued to test, in particular the severe overload conditions
from [2].
Under heavy overload my test computer just hangs. My multiple
ssh sessions eventually terminate. I have left it for any hours, but
have to reset it in the end.
The first time there were no log entries at all, at least that I could
find.
The second time:
kernel: BUG: kernel NULL pointer dereference, address: 0000000000000051
kernel: #PF: supervisor read access in kernel mode
kernel: #PF: error_code(0x0000) - not-present page
kernel: PGD 0 P4D 0
kernel: Oops: Oops: 0000 [#1] SMP NOPTI
kernel: CPU: 11 UID: 1000 PID: 3597 Comm: yes Not tainted 6.19.0-rc1-pz #1 PREEMPT(full)
...
The entire relevant part is attached.
Conditions:
Greater than 12,500 X (yes > /dev/null) tasks
But less than 15,000 X ( yes > /dev/null) tasks
I have tested up to 20,000 X (yes > /dev/null) tasks
with previous kernels, including mainline 6.19-rc1.
I would not disagree if you say my operating conditions
are ridiculous.
System:
Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz, 6 cores 12 CPUs.
CPU frequency scaling driver: intel_pstate; Governor powersave.
HWP: Enabled
[1] https://lore.kernel.org/lkml/000d01dc939e$0fc99fe0$2f5cdfa0$@telus.net/
[2] https://lore.kernel.org/lkml/002401dbb6bd$4527ec00$cf77c400$@telus.net/
... Doug
[-- Attachment #2: kern.log --]
[-- Type: application/octet-stream, Size: 67091 bytes --]
2026-02-02T16:13:33.017238-08:00 s19 kernel: BUG: kernel NULL pointer dereference, address: 0000000000000051
2026-02-02T16:13:33.017248-08:00 s19 kernel: #PF: supervisor read access in kernel mode
2026-02-02T16:13:33.017249-08:00 s19 kernel: #PF: error_code(0x0000) - not-present page
2026-02-02T16:13:33.017251-08:00 s19 kernel: PGD 0 P4D 0
2026-02-02T16:13:33.017382-08:00 s19 kernel: Oops: Oops: 0000 [#1] SMP NOPTI
2026-02-02T16:13:33.017384-08:00 s19 kernel: CPU: 11 UID: 1000 PID: 3597 Comm: yes Not tainted 6.19.0-rc1-pz #1 PREEMPT(full)
2026-02-02T16:13:33.017385-08:00 s19 kernel: Hardware name: ASUS System Product Name/PRIME Z490-A, BIOS 9902 09/15/2021
2026-02-02T16:13:33.017386-08:00 s19 kernel: RIP: 0010:pick_task_fair+0x3e/0x140
2026-02-02T16:13:33.017386-08:00 s19 kernel: Code: 53 48 89 fb 48 83 ec 08 8b 8f 10 01 00 00 85 c9 0f 84 96 00 00 00 4c 89 ef 45 31 e4 eb 27 66 90 be 01 00 00 00 e8 92 41 ff ff <80> 78 51 00 75 5e 48 85 c0 74 69 48 8b b8 b0 00 00 00 48 85 ff 0f
2026-02-02T16:13:33.017387-08:00 s19 kernel: RSP: 0018:ffffd095863ef7a8 EFLAGS: 00010046
2026-02-02T16:13:33.017388-08:00 s19 kernel: RAX: 0000000000000000 RBX: ffff89298e5b2f40 RCX: 0000000000000000
2026-02-02T16:13:33.017388-08:00 s19 kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
2026-02-02T16:13:33.017389-08:00 s19 kernel: RBP: ffffd095863ef7c8 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:13:33.017390-08:00 s19 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
2026-02-02T16:13:33.017390-08:00 s19 kernel: R13: ffff89298e5b3040 R14: ffff89298e5b2f40 R15: 0000000000000000
2026-02-02T16:13:33.017391-08:00 s19 kernel: FS: 00007e443ac91740(0000) GS:ffff8929d1bd7000(0000) knlGS:0000000000000000
2026-02-02T16:13:33.017391-08:00 s19 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-02-02T16:13:33.017392-08:00 s19 kernel: CR2: 0000000000000051 CR3: 0000000147ece001 CR4: 00000000007726f0
2026-02-02T16:13:33.017392-08:00 s19 kernel: PKRU: 55555554
2026-02-02T16:13:33.017393-08:00 s19 kernel: Call Trace:
2026-02-02T16:13:33.017394-08:00 s19 kernel: <TASK>
2026-02-02T16:13:33.017394-08:00 s19 kernel: pick_next_task_fair+0x37/0x930
2026-02-02T16:13:33.017395-08:00 s19 kernel: __pick_next_task+0x44/0x1e0
2026-02-02T16:13:33.017395-08:00 s19 kernel: __schedule+0x1e6/0x1810
2026-02-02T16:13:33.017396-08:00 s19 kernel: ? aa_file_perm+0x6e/0x5d0
2026-02-02T16:13:33.017398-08:00 s19 kernel: message repeated 2 times: [ ? aa_file_perm+0x6e/0x5d0]
2026-02-02T16:13:33.017399-08:00 s19 kernel: ? show_vpd_pgb2+0x14/0x80
2026-02-02T16:13:33.017402-08:00 s19 kernel: ? aa_file_perm+0x6e/0x5d0
2026-02-02T16:13:33.017402-08:00 s19 kernel: preempt_schedule_irq+0x38/0x70
2026-02-02T16:13:33.017403-08:00 s19 kernel: raw_irqentry_exit_cond_resched+0x31/0x40
2026-02-02T16:13:33.017403-08:00 s19 kernel: irqentry_exit+0x34/0x710
2026-02-02T16:13:33.017404-08:00 s19 kernel: sysvec_apic_timer_interrupt+0x57/0xc0
2026-02-02T16:13:33.017404-08:00 s19 kernel: asm_sysvec_apic_timer_interrupt+0x1b/0x20
2026-02-02T16:13:33.017405-08:00 s19 kernel: RIP: 0010:vfs_write+0x2c1/0x480
2026-02-02T16:13:33.017406-08:00 s19 kernel: Code: 00 00 e8 2e 92 c2 05 49 89 c4 48 3d ef fd ff ff 0f 84 2f 01 00 00 48 85 c0 0f 8e 63 fe ff ff 48 8b 45 a8 49 89 06 41 8b 45 04 <25> 00 00 00 06 3d 00 00 00 02 74 57 49 8b 7d 48 4c 8b 4f 30 49 8b
2026-02-02T16:13:33.017406-08:00 s19 kernel: RSP: 0018:ffffd095863efa80 EFLAGS: 00000206
2026-02-02T16:13:33.017407-08:00 s19 kernel: RAX: 000000000c0c001e RBX: ffff8922879caa00 RCX: ffffd095863efb20
2026-02-02T16:13:33.017407-08:00 s19 kernel: RDX: 0000000000000000 RSI: 0000633d552d74a0 RDI: ffff892287eba840
2026-02-02T16:13:33.017408-08:00 s19 kernel: RBP: ffffd095863efb10 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:13:33.017408-08:00 s19 kernel: R10: 0000000000002000 R11: 0000000000000000 R12: 0000000000002000
2026-02-02T16:13:33.017409-08:00 s19 kernel: R13: ffff892287eba840 R14: ffffd095863efb20 R15: 0000633d552d74a0
2026-02-02T16:13:33.017409-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017410-08:00 s19 kernel: ksys_write+0x71/0xf0
2026-02-02T16:13:33.017410-08:00 s19 kernel: __x64_sys_write+0x19/0x30
2026-02-02T16:13:33.017411-08:00 s19 kernel: x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017411-08:00 s19 kernel: do_syscall_64+0x81/0x500
2026-02-02T16:13:33.017412-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:13:33.017413-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:13:33.017414-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017415-08:00 s19 kernel: message repeated 2 times: [ ? ksys_write+0x71/0xf0]
2026-02-02T16:13:33.017416-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:13:33.017417-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017417-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:13:33.017418-08:00 s19 kernel: ? common_file_perm+0x6b/0x1a0
2026-02-02T16:13:33.017418-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:13:33.017420-08:00 s19 kernel: message repeated 2 times: [ ? vfs_write+0x324/0x480]
2026-02-02T16:13:33.017420-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017421-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017422-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:13:33.017423-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017423-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:13:33.017424-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:13:33.017429-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:13:33.017430-08:00 s19 kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e
2026-02-02T16:13:33.017431-08:00 s19 kernel: RIP: 0033:0x7e443ab1c5a4
2026-02-02T16:13:33.017431-08:00 s19 kernel: Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d a5 ea 0e 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
2026-02-02T16:13:33.017432-08:00 s19 kernel: RSP: 002b:00007ffe3db6c1f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
2026-02-02T16:13:33.017433-08:00 s19 kernel: RAX: ffffffffffffffda RBX: 0000000000002000 RCX: 00007e443ab1c5a4
2026-02-02T16:13:33.017433-08:00 s19 kernel: RDX: 0000000000002000 RSI: 0000633d552d74a0 RDI: 0000000000000001
2026-02-02T16:13:33.017434-08:00 s19 kernel: RBP: 00007ffe3db6c250 R08: 00007e443ac03b20 R09: 0000000000000000
2026-02-02T16:13:33.017434-08:00 s19 kernel: R10: 0000000000000001 R11: 0000000000000202 R12: 0000000000002000
2026-02-02T16:13:33.017435-08:00 s19 kernel: R13: 0000633d552d74a0 R14: 0000000000002000 R15: 0000000000002000
2026-02-02T16:13:33.017435-08:00 s19 kernel: </TASK>
2026-02-02T16:13:33.017436-08:00 s19 kernel: Modules linked in: tls snd_hda_codec_intelhdmi snd_hda_codec_alc882 snd_hda_codec_realtek_lib qrtr snd_hda_codec_generic snd_hda_intel snd_sof_pci_intel_cnl snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda snd_hda_codec_hdmi soundwire_cadence snd_sof_pci intel_rapl_msr snd_sof_xtensa_dsp intel_rapl_common bridge intel_uncore_frequency snd_sof stp intel_uncore_frequency_common llc snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation cfg80211 snd_soc_sdw_utils snd_soc_acpi soundwire_bus snd_soc_sdca crc8 snd_soc_avs snd_soc_hda_codec snd_hda_ext_core intel_tcc_cooling x86_pkg_temp_thermal snd_hda_codec intel_powerclamp coretemp snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep binfmt_misc kvm_intel cmdlinepart i915 snd_soc_core spi_nor snd_compress ee1004 mtd mei_hdcp mei_pxp ac97_bus drm_buddy snd_pcm_dmaengine kvm snd_pcm ttm irqbypass
2026-02-02T16:13:33.017437-08:00 s19 kernel: drm_display_helper i2c_i801 eeepc_wmi snd_timer rapl nls_iso8859_1 intel_cstate asus_wmi snd i2c_smbus platform_profile spi_intel_pci cec wmi_bmof i2c_mux mei_me soundcore intel_wmi_thunderbolt sparse_keymap mxm_wmi spi_intel rc_core mei i2c_algo_bit intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec acpi_pad acpi_tad joydev input_leds mac_hid sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b libblake2b raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 linear hid_generic usbhid hid nvme nvme_core nvme_keyring ghash_clmulni_intel nvme_auth intel_lpss_pci ahci igc intel_lpss hkdf libahci idma64 video wmi aesni_intel
2026-02-02T16:13:33.017438-08:00 s19 kernel: CR2: 0000000000000051
2026-02-02T16:13:33.017439-08:00 s19 kernel: ---[ end trace 0000000000000000 ]---
2026-02-02T16:13:33.017439-08:00 s19 kernel: watchdog: CPU5: Watchdog detected hard LOCKUP on cpu 5
2026-02-02T16:13:33.017440-08:00 s19 kernel: Modules linked in: tls snd_hda_codec_intelhdmi snd_hda_codec_alc882 snd_hda_codec_realtek_lib qrtr snd_hda_codec_generic snd_hda_intel snd_sof_pci_intel_cnl snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda snd_hda_codec_hdmi soundwire_cadence snd_sof_pci intel_rapl_msr snd_sof_xtensa_dsp intel_rapl_common bridge intel_uncore_frequency snd_sof stp intel_uncore_frequency_common llc snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation cfg80211 snd_soc_sdw_utils snd_soc_acpi soundwire_bus snd_soc_sdca crc8 snd_soc_avs snd_soc_hda_codec snd_hda_ext_core intel_tcc_cooling x86_pkg_temp_thermal snd_hda_codec intel_powerclamp coretemp snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep binfmt_misc kvm_intel cmdlinepart i915 snd_soc_core spi_nor snd_compress ee1004 mtd mei_hdcp mei_pxp ac97_bus drm_buddy snd_pcm_dmaengine kvm snd_pcm ttm irqbypass
2026-02-02T16:13:33.017488-08:00 s19 kernel: drm_display_helper i2c_i801 eeepc_wmi snd_timer rapl nls_iso8859_1 intel_cstate asus_wmi snd i2c_smbus platform_profile spi_intel_pci cec wmi_bmof i2c_mux mei_me soundcore intel_wmi_thunderbolt sparse_keymap mxm_wmi spi_intel rc_core mei i2c_algo_bit intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec acpi_pad acpi_tad joydev input_leds mac_hid sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b libblake2b raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 linear hid_generic usbhid hid nvme nvme_core nvme_keyring ghash_clmulni_intel nvme_auth intel_lpss_pci ahci igc intel_lpss hkdf libahci idma64 video wmi aesni_intel
2026-02-02T16:13:33.017488-08:00 s19 kernel: CPU: 5 UID: 1000 PID: 15564 Comm: yes Tainted: G D 6.19.0-rc1-pz #1 PREEMPT(full)
2026-02-02T16:13:33.017489-08:00 s19 kernel: Tainted: [D]=DIE
2026-02-02T16:13:33.017489-08:00 s19 kernel: Hardware name: ASUS System Product Name/PRIME Z490-A, BIOS 9902 09/15/2021
2026-02-02T16:13:33.017490-08:00 s19 kernel: RIP: 0010:native_queued_spin_lock_slowpath+0x81/0x300
2026-02-02T16:13:33.017490-08:00 s19 kernel: Code: 00 00 f0 0f ba 2b 08 0f 92 c2 8b 03 0f b6 d2 c1 e2 08 30 e4 09 d0 3d ff 00 00 00 77 6c 85 c0 74 10 0f b6 03 84 c0 74 09 f3 90 <0f> b6 03 84 c0 75 f7 b8 01 00 00 00 66 89 03 5b 41 5c 41 5d 41 5e
2026-02-02T16:13:33.017491-08:00 s19 kernel: RSP: 0018:ffffd09580294d00 EFLAGS: 00000002
2026-02-02T16:13:33.017492-08:00 s19 kernel: RAX: 0000000000000001 RBX: ffff89298e5b2f88 RCX: 0000000000000000
2026-02-02T16:13:33.017492-08:00 s19 kernel: RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff89298e5b2f88
2026-02-02T16:13:33.017493-08:00 s19 kernel: RBP: ffffd09580294d28 R08: ffff89298e5b2f40 R09: 0000000000000000
2026-02-02T16:13:33.017493-08:00 s19 kernel: R10: 000000000000082a R11: 000000000000000c R12: 0000000000000400
2026-02-02T16:13:33.017494-08:00 s19 kernel: R13: ffffd09580294e78 R14: ffffffffbc9dbf40 R15: ffffffffbc9dbf40
2026-02-02T16:13:33.017494-08:00 s19 kernel: FS: 00007b6638d38740(0000) GS:ffff8929d18d7000(0000) knlGS:0000000000000000
2026-02-02T16:13:33.017495-08:00 s19 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-02-02T16:13:33.017495-08:00 s19 kernel: CR2: 000073fa8d0ee200 CR3: 00000001ec51c001 CR4: 00000000007726f0
2026-02-02T16:13:33.017496-08:00 s19 kernel: PKRU: 55555554
2026-02-02T16:13:33.017496-08:00 s19 kernel: Call Trace:
2026-02-02T16:13:33.017497-08:00 s19 kernel: <IRQ>
2026-02-02T16:13:33.017497-08:00 s19 kernel: _raw_spin_lock+0x3f/0x60
2026-02-02T16:13:33.017498-08:00 s19 kernel: raw_spin_rq_lock_nested+0x23/0xb0
2026-02-02T16:13:33.017498-08:00 s19 kernel: _raw_spin_rq_lock_irqsave+0x21/0x40
2026-02-02T16:13:33.017499-08:00 s19 kernel: sched_balance_rq+0x705/0x14d0
2026-02-02T16:13:33.017499-08:00 s19 kernel: sched_balance_domains+0x26f/0x3c0
2026-02-02T16:13:33.017500-08:00 s19 kernel: sched_balance_softirq+0x51/0x80
2026-02-02T16:13:33.017500-08:00 s19 kernel: handle_softirqs+0xe7/0x340
2026-02-02T16:13:33.017501-08:00 s19 kernel: __irq_exit_rcu+0x10e/0x130
2026-02-02T16:13:33.017502-08:00 s19 kernel: irq_exit_rcu+0xe/0x20
2026-02-02T16:13:33.017502-08:00 s19 kernel: sysvec_apic_timer_interrupt+0xa0/0xc0
2026-02-02T16:13:33.017503-08:00 s19 kernel: </IRQ>
2026-02-02T16:13:33.017503-08:00 s19 kernel: <TASK>
2026-02-02T16:13:33.017504-08:00 s19 kernel: asm_sysvec_apic_timer_interrupt+0x1b/0x20
2026-02-02T16:13:33.017504-08:00 s19 kernel: RIP: 0010:do_syscall_64+0x47/0x500
2026-02-02T16:13:33.017505-08:00 s19 kernel: Code: 00 00 48 83 c0 0f 25 f8 07 00 00 48 29 c4 48 8d 44 24 0f 48 83 e0 f0 4d 63 ee 0f 1f 44 00 00 0f 1f 44 00 00 fb 0f 1f 44 00 00 <65> 4c 8b 25 c9 d4 43 01 49 8b 54 24 08 f6 c2 bf 0f 85 e8 02 00 00
2026-02-02T16:13:33.017505-08:00 s19 kernel: RSP: 0018:ffffd095ad857ca0 EFLAGS: 00000286
2026-02-02T16:13:33.017506-08:00 s19 kernel: RAX: ffffd095ad857ca0 RBX: ffffd095ad857f48 RCX: 0000000000000000
2026-02-02T16:13:33.017506-08:00 s19 kernel: RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffd095ad857f48
2026-02-02T16:13:33.017507-08:00 s19 kernel: RBP: ffffd095ad857f38 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:13:33.017507-08:00 s19 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
2026-02-02T16:13:33.017508-08:00 s19 kernel: R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
2026-02-02T16:13:33.017508-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017509-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:13:33.017510-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:13:33.017510-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:13:33.017511-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017511-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:13:33.017512-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017513-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:13:33.017513-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017514-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:13:33.017514-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017515-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:13:33.017515-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017516-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:13:33.017516-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017517-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:13:33.017517-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:13:33.017518-08:00 s19 kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e
2026-02-02T16:13:33.017519-08:00 s19 kernel: RIP: 0033:0x7b6638b1c5a4
2026-02-02T16:13:33.017519-08:00 s19 kernel: Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d a5 ea 0e 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
2026-02-02T16:13:33.017520-08:00 s19 kernel: RSP: 002b:00007ffc8d0f7d88 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
2026-02-02T16:13:33.017521-08:00 s19 kernel: RAX: ffffffffffffffda RBX: 0000000000002000 RCX: 00007b6638b1c5a4
2026-02-02T16:13:33.017521-08:00 s19 kernel: RDX: 0000000000002000 RSI: 000056a0858e24a0 RDI: 0000000000000001
2026-02-02T16:13:33.017522-08:00 s19 kernel: RBP: 00007ffc8d0f7de0 R08: 00007b6638c03b20 R09: 0000000000000000
2026-02-02T16:13:33.017522-08:00 s19 kernel: R10: 0000000000000001 R11: 0000000000000202 R12: 0000000000002000
2026-02-02T16:13:33.017523-08:00 s19 kernel: R13: 000056a0858e24a0 R14: 0000000000002000 R15: 0000000000002000
2026-02-02T16:13:33.017523-08:00 s19 kernel: </TASK>
2026-02-02T16:13:33.017524-08:00 s19 kernel: watchdog: CPU11: Watchdog detected hard LOCKUP on cpu 11
2026-02-02T16:13:33.017524-08:00 s19 kernel: Modules linked in: tls snd_hda_codec_intelhdmi snd_hda_codec_alc882 snd_hda_codec_realtek_lib qrtr snd_hda_codec_generic snd_hda_intel snd_sof_pci_intel_cnl snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda snd_hda_codec_hdmi soundwire_cadence snd_sof_pci intel_rapl_msr snd_sof_xtensa_dsp intel_rapl_common bridge intel_uncore_frequency snd_sof stp intel_uncore_frequency_common llc snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation cfg80211 snd_soc_sdw_utils snd_soc_acpi soundwire_bus snd_soc_sdca crc8 snd_soc_avs snd_soc_hda_codec snd_hda_ext_core intel_tcc_cooling x86_pkg_temp_thermal snd_hda_codec intel_powerclamp coretemp snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep binfmt_misc kvm_intel cmdlinepart i915 snd_soc_core spi_nor snd_compress ee1004 mtd mei_hdcp mei_pxp ac97_bus drm_buddy snd_pcm_dmaengine kvm snd_pcm ttm irqbypass
2026-02-02T16:13:33.017525-08:00 s19 kernel: drm_display_helper i2c_i801 eeepc_wmi snd_timer rapl nls_iso8859_1 intel_cstate asus_wmi snd i2c_smbus platform_profile spi_intel_pci cec wmi_bmof i2c_mux mei_me soundcore intel_wmi_thunderbolt sparse_keymap mxm_wmi spi_intel rc_core mei i2c_algo_bit intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec acpi_pad acpi_tad joydev input_leds mac_hid sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b libblake2b raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 linear hid_generic usbhid hid nvme nvme_core nvme_keyring ghash_clmulni_intel nvme_auth intel_lpss_pci ahci igc intel_lpss hkdf libahci idma64 video wmi aesni_intel
2026-02-02T16:13:33.017526-08:00 s19 kernel: CPU: 11 UID: 1000 PID: 3597 Comm: yes Tainted: G D 6.19.0-rc1-pz #1 PREEMPT(full)
2026-02-02T16:13:33.017526-08:00 s19 kernel: Tainted: [D]=DIE
2026-02-02T16:13:33.017527-08:00 s19 kernel: Hardware name: ASUS System Product Name/PRIME Z490-A, BIOS 9902 09/15/2021
2026-02-02T16:13:33.017527-08:00 s19 kernel: RIP: 0010:native_queued_spin_lock_slowpath+0x238/0x300
2026-02-02T16:13:33.017528-08:00 s19 kernel: Code: 41 c1 e5 10 c1 e0 12 45 89 ee 41 09 c6 44 89 f0 c1 e8 10 66 87 43 02 89 c2 c1 e2 10 81 fa ff ff 00 00 77 51 31 d2 eb 02 f3 90 <8b> 03 66 85 c0 75 f7 44 39 f0 0f 84 91 00 00 00 c6 03 01 48 85 d2
2026-02-02T16:13:33.017529-08:00 s19 kernel: RSP: 0018:ffffd095863eefe0 EFLAGS: 00000002
2026-02-02T16:13:33.017529-08:00 s19 kernel: RAX: 0000000000300101 RBX: ffff89298e5b2f88 RCX: ffffffffbc9dbf40
2026-02-02T16:13:33.017530-08:00 s19 kernel: RDX: 0000000000000000 RSI: 0000000000000101 RDI: ffff89298e5b2f88
2026-02-02T16:13:33.017530-08:00 s19 kernel: RBP: ffffd095863ef008 R08: 0000000000000000 R09: 000000000000000b
2026-02-02T16:13:33.017531-08:00 s19 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: ffff89298e5b3e40
2026-02-02T16:13:33.017531-08:00 s19 kernel: R13: 0000000000000000 R14: 0000000000300000 R15: ffff89298e5b2f40
2026-02-02T16:13:33.017585-08:00 s19 kernel: FS: 00007e443ac91740(0000) GS:ffff8929d1bd7000(0000) knlGS:0000000000000000
2026-02-02T16:13:33.017585-08:00 s19 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-02-02T16:13:33.017586-08:00 s19 kernel: CR2: 0000000000000051 CR3: 0000000147ece001 CR4: 00000000007726f0
2026-02-02T16:13:33.017586-08:00 s19 kernel: PKRU: 55555554
2026-02-02T16:13:33.017587-08:00 s19 kernel: Call Trace:
2026-02-02T16:13:33.017588-08:00 s19 kernel: <TASK>
2026-02-02T16:13:33.017588-08:00 s19 kernel: _raw_spin_lock+0x3f/0x60
2026-02-02T16:13:33.017589-08:00 s19 kernel: raw_spin_rq_lock_nested+0x23/0xb0
2026-02-02T16:13:33.017589-08:00 s19 kernel: try_to_wake_up+0x272/0x780
2026-02-02T16:13:33.017590-08:00 s19 kernel: wake_up_process+0x15/0x30
2026-02-02T16:13:33.017590-08:00 s19 kernel: kick_pool+0x8c/0x1b0
2026-02-02T16:13:33.017591-08:00 s19 kernel: __queue_work+0x2f9/0x570
2026-02-02T16:13:33.017591-08:00 s19 kernel: queue_work_on+0x77/0x80
2026-02-02T16:13:33.017592-08:00 s19 kernel: drm_fb_helper_damage.part.0+0xb3/0xe0
2026-02-02T16:13:33.017592-08:00 s19 kernel: drm_fb_helper_damage_area+0x31/0x50
2026-02-02T16:13:33.017593-08:00 s19 kernel: intel_fbdev_defio_imageblit+0x2b/0x40 [i915]
2026-02-02T16:13:33.017594-08:00 s19 kernel: soft_cursor+0x198/0x240
2026-02-02T16:13:33.017594-08:00 s19 kernel: bit_cursor+0x3cd/0x670
2026-02-02T16:13:33.017595-08:00 s19 kernel: ? __pfx_bit_cursor+0x10/0x10
2026-02-02T16:13:33.017595-08:00 s19 kernel: fbcon_cursor+0x130/0x1b0
2026-02-02T16:13:33.017596-08:00 s19 kernel: hide_cursor+0x2f/0xd0
2026-02-02T16:13:33.017596-08:00 s19 kernel: vt_console_print+0x475/0x4f0
2026-02-02T16:13:33.017597-08:00 s19 kernel: ? nbcon_get_cpu_emergency_nesting+0xe/0x40
2026-02-02T16:13:33.017597-08:00 s19 kernel: console_flush_one_record+0x2a4/0x3b0
2026-02-02T16:13:33.017598-08:00 s19 kernel: console_unlock+0x7d/0x130
2026-02-02T16:13:33.017598-08:00 s19 kernel: vprintk_emit+0x386/0x3f0
2026-02-02T16:13:33.017599-08:00 s19 kernel: vprintk_default+0x1d/0x30
2026-02-02T16:13:33.017599-08:00 s19 kernel: vprintk+0x18/0x50
2026-02-02T16:13:33.017600-08:00 s19 kernel: _printk+0x5f/0x90
2026-02-02T16:13:33.017600-08:00 s19 kernel: oops_exit+0x26/0x50
2026-02-02T16:13:33.017601-08:00 s19 kernel: oops_end+0x6d/0xf0
2026-02-02T16:13:33.017601-08:00 s19 kernel: page_fault_oops+0x199/0x5c0
2026-02-02T16:13:33.017602-08:00 s19 kernel: ? update_load_avg+0x7b/0x250
2026-02-02T16:13:33.017602-08:00 s19 kernel: do_user_addr_fault+0x4af/0x8d0
2026-02-02T16:13:33.017603-08:00 s19 kernel: ? update_cfs_rq_load_avg+0x2e/0x230
2026-02-02T16:13:33.017603-08:00 s19 kernel: exc_page_fault+0x7f/0x1b0
2026-02-02T16:13:33.017604-08:00 s19 kernel: asm_exc_page_fault+0x27/0x30
2026-02-02T16:13:33.017604-08:00 s19 kernel: RIP: 0010:pick_task_fair+0x3e/0x140
2026-02-02T16:13:33.017605-08:00 s19 kernel: Code: 53 48 89 fb 48 83 ec 08 8b 8f 10 01 00 00 85 c9 0f 84 96 00 00 00 4c 89 ef 45 31 e4 eb 27 66 90 be 01 00 00 00 e8 92 41 ff ff <80> 78 51 00 75 5e 48 85 c0 74 69 48 8b b8 b0 00 00 00 48 85 ff 0f
2026-02-02T16:13:33.017606-08:00 s19 kernel: RSP: 0018:ffffd095863ef7a8 EFLAGS: 00010046
2026-02-02T16:13:33.017606-08:00 s19 kernel: RAX: 0000000000000000 RBX: ffff89298e5b2f40 RCX: 0000000000000000
2026-02-02T16:13:33.017607-08:00 s19 kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
2026-02-02T16:13:33.017607-08:00 s19 kernel: RBP: ffffd095863ef7c8 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:13:33.017608-08:00 s19 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
2026-02-02T16:13:33.017608-08:00 s19 kernel: R13: ffff89298e5b3040 R14: ffff89298e5b2f40 R15: 0000000000000000
2026-02-02T16:13:33.017609-08:00 s19 kernel: ? pick_task_fair+0x3e/0x140
2026-02-02T16:13:33.017609-08:00 s19 kernel: pick_next_task_fair+0x37/0x930
2026-02-02T16:13:33.017610-08:00 s19 kernel: __pick_next_task+0x44/0x1e0
2026-02-02T16:13:33.017610-08:00 s19 kernel: __schedule+0x1e6/0x1810
2026-02-02T16:13:33.017611-08:00 s19 kernel: ? aa_file_perm+0x6e/0x5d0
2026-02-02T16:13:33.017612-08:00 s19 kernel: message repeated 2 times: [ ? aa_file_perm+0x6e/0x5d0]
2026-02-02T16:13:33.017613-08:00 s19 kernel: ? show_vpd_pgb2+0x14/0x80
2026-02-02T16:13:33.017614-08:00 s19 kernel: ? aa_file_perm+0x6e/0x5d0
2026-02-02T16:13:33.017615-08:00 s19 kernel: preempt_schedule_irq+0x38/0x70
2026-02-02T16:13:33.017615-08:00 s19 kernel: raw_irqentry_exit_cond_resched+0x31/0x40
2026-02-02T16:13:33.017616-08:00 s19 kernel: irqentry_exit+0x34/0x710
2026-02-02T16:13:33.017616-08:00 s19 kernel: sysvec_apic_timer_interrupt+0x57/0xc0
2026-02-02T16:13:33.017617-08:00 s19 kernel: asm_sysvec_apic_timer_interrupt+0x1b/0x20
2026-02-02T16:13:33.017617-08:00 s19 kernel: RIP: 0010:vfs_write+0x2c1/0x480
2026-02-02T16:13:33.017618-08:00 s19 kernel: Code: 00 00 e8 2e 92 c2 05 49 89 c4 48 3d ef fd ff ff 0f 84 2f 01 00 00 48 85 c0 0f 8e 63 fe ff ff 48 8b 45 a8 49 89 06 41 8b 45 04 <25> 00 00 00 06 3d 00 00 00 02 74 57 49 8b 7d 48 4c 8b 4f 30 49 8b
2026-02-02T16:13:33.017618-08:00 s19 kernel: RSP: 0018:ffffd095863efa80 EFLAGS: 00000206
2026-02-02T16:13:33.017619-08:00 s19 kernel: RAX: 000000000c0c001e RBX: ffff8922879caa00 RCX: ffffd095863efb20
2026-02-02T16:13:33.017619-08:00 s19 kernel: RDX: 0000000000000000 RSI: 0000633d552d74a0 RDI: ffff892287eba840
2026-02-02T16:13:33.017620-08:00 s19 kernel: RBP: ffffd095863efb10 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:13:33.017620-08:00 s19 kernel: R10: 0000000000002000 R11: 0000000000000000 R12: 0000000000002000
2026-02-02T16:13:33.017621-08:00 s19 kernel: R13: ffff892287eba840 R14: ffffd095863efb20 R15: 0000633d552d74a0
2026-02-02T16:13:33.017621-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017622-08:00 s19 kernel: ksys_write+0x71/0xf0
2026-02-02T16:13:33.017622-08:00 s19 kernel: __x64_sys_write+0x19/0x30
2026-02-02T16:13:33.017623-08:00 s19 kernel: x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017623-08:00 s19 kernel: do_syscall_64+0x81/0x500
2026-02-02T16:13:33.017624-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:13:33.017624-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:13:33.017625-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017627-08:00 s19 kernel: message repeated 2 times: [ ? ksys_write+0x71/0xf0]
2026-02-02T16:13:33.017628-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:13:33.017629-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017629-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:13:33.017630-08:00 s19 kernel: ? common_file_perm+0x6b/0x1a0
2026-02-02T16:13:33.017630-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:13:33.017631-08:00 s19 kernel: message repeated 2 times: [ ? vfs_write+0x324/0x480]
2026-02-02T16:13:33.017632-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017633-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:13:33.017634-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:13:33.017634-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:13:33.017635-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:13:33.017635-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:13:33.017636-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:13:33.017637-08:00 s19 kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e
2026-02-02T16:13:33.017637-08:00 s19 kernel: RIP: 0033:0x7e443ab1c5a4
2026-02-02T16:13:33.017638-08:00 s19 kernel: Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d a5 ea 0e 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
2026-02-02T16:13:33.017639-08:00 s19 kernel: RSP: 002b:00007ffe3db6c1f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
2026-02-02T16:13:33.017639-08:00 s19 kernel: RAX: ffffffffffffffda RBX: 0000000000002000 RCX: 00007e443ab1c5a4
2026-02-02T16:13:33.017640-08:00 s19 kernel: RDX: 0000000000002000 RSI: 0000633d552d74a0 RDI: 0000000000000001
2026-02-02T16:13:33.017640-08:00 s19 kernel: RBP: 00007ffe3db6c250 R08: 00007e443ac03b20 R09: 0000000000000000
2026-02-02T16:13:33.017641-08:00 s19 kernel: R10: 0000000000000001 R11: 0000000000000202 R12: 0000000000002000
2026-02-02T16:13:33.017641-08:00 s19 kernel: R13: 0000633d552d74a0 R14: 0000000000002000 R15: 0000000000002000
2026-02-02T16:13:33.017642-08:00 s19 kernel: </TASK>
2026-02-02T16:13:33.017642-08:00 s19 kernel: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
2026-02-02T16:13:33.017643-08:00 s19 kernel: rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P12753 P6509 P5261 P15769 P8594 P5431 P10107 P14333 P6906 } 61514 jiffies s: 873 root: 0x0/T
2026-02-02T16:13:33.017643-08:00 s19 kernel: rcu: blocking rcu_node structures (internal RCU debug):
2026-02-02T16:15:23.234373-08:00 s19 kernel: watchdog: CPU0: Watchdog detected hard LOCKUP on cpu 0
2026-02-02T16:15:23.234414-08:00 s19 kernel: Modules linked in: tls snd_hda_codec_intelhdmi snd_hda_codec_alc882 snd_hda_codec_realtek_lib qrtr snd_hda_codec_generic snd_hda_intel snd_sof_pci_intel_cnl snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda snd_hda_codec_hdmi soundwire_cadence snd_sof_pci intel_rapl_msr snd_sof_xtensa_dsp intel_rapl_common bridge intel_uncore_frequency snd_sof stp intel_uncore_frequency_common llc snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation cfg80211 snd_soc_sdw_utils snd_soc_acpi soundwire_bus snd_soc_sdca crc8 snd_soc_avs snd_soc_hda_codec snd_hda_ext_core intel_tcc_cooling x86_pkg_temp_thermal snd_hda_codec intel_powerclamp coretemp snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep binfmt_misc kvm_intel cmdlinepart i915 snd_soc_core spi_nor snd_compress ee1004 mtd mei_hdcp mei_pxp ac97_bus drm_buddy snd_pcm_dmaengine kvm snd_pcm ttm irqbypass
2026-02-02T16:15:23.234418-08:00 s19 kernel: drm_display_helper i2c_i801 eeepc_wmi snd_timer rapl nls_iso8859_1 intel_cstate asus_wmi snd i2c_smbus platform_profile spi_intel_pci cec wmi_bmof i2c_mux mei_me soundcore intel_wmi_thunderbolt sparse_keymap mxm_wmi spi_intel rc_core mei i2c_algo_bit intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec acpi_pad acpi_tad joydev input_leds mac_hid sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b libblake2b raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 linear hid_generic usbhid hid nvme nvme_core nvme_keyring ghash_clmulni_intel nvme_auth intel_lpss_pci ahci igc intel_lpss hkdf libahci idma64 video wmi aesni_intel
2026-02-02T16:15:23.234419-08:00 s19 kernel: CPU: 0 UID: 1000 PID: 4539 Comm: yes Tainted: G D 6.19.0-rc1-pz #1 PREEMPT(full)
2026-02-02T16:15:23.234420-08:00 s19 kernel: Tainted: [D]=DIE
2026-02-02T16:15:23.234420-08:00 s19 kernel: Hardware name: ASUS System Product Name/PRIME Z490-A, BIOS 9902 09/15/2021
2026-02-02T16:15:23.234421-08:00 s19 kernel: RIP: 0010:vprintk_emit+0x30f/0x3f0
2026-02-02T16:15:23.234421-08:00 s19 kernel: Code: 84 d5 00 00 00 65 4c 3b 35 16 52 58 02 0f 84 c7 00 00 00 48 c7 c7 28 6b a5 bc c6 05 05 ad 61 02 01 e8 15 26 16 01 eb 02 f3 90 <44> 0f b6 25 f4 ac 61 02 41 80 fc 01 0f 87 ac ca dc ff 41 83 e4 01
2026-02-02T16:15:23.234422-08:00 s19 kernel: RSP: 0018:ffffd09580003cc0 EFLAGS: 00000002
2026-02-02T16:15:23.234422-08:00 s19 kernel: RAX: 0000000000000000 RBX: 0000000000000035 RCX: 0000000000000000
2026-02-02T16:15:23.234423-08:00 s19 kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
2026-02-02T16:15:23.234423-08:00 s19 kernel: RBP: ffffd09580003d18 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:15:23.234424-08:00 s19 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
2026-02-02T16:15:23.234425-08:00 s19 kernel: R13: 0000000000000046 R14: ffff8922879caa00 R15: ffff89298e0219c0
2026-02-02T16:15:23.234425-08:00 s19 kernel: FS: 00007a4931c5b740(0000) GS:ffff8929d1657000(0000) knlGS:0000000000000000
2026-02-02T16:15:23.234426-08:00 s19 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-02-02T16:15:23.234426-08:00 s19 kernel: CR2: 00005e6c5c0456c8 CR3: 00000001529ed001 CR4: 00000000007726f0
2026-02-02T16:15:23.234427-08:00 s19 kernel: PKRU: 55555554
2026-02-02T16:15:23.234427-08:00 s19 kernel: Call Trace:
2026-02-02T16:15:23.234428-08:00 s19 kernel: <IRQ>
2026-02-02T16:15:23.234428-08:00 s19 kernel: vprintk_default+0x1d/0x30
2026-02-02T16:15:23.234429-08:00 s19 kernel: vprintk+0x18/0x50
2026-02-02T16:15:23.234429-08:00 s19 kernel: _printk+0x5f/0x90
2026-02-02T16:15:23.234430-08:00 s19 kernel: rcu_sched_clock_irq+0xb8a/0x1800
2026-02-02T16:15:23.234430-08:00 s19 kernel: ? update_cfs_rq_load_avg+0x2e/0x230
2026-02-02T16:15:23.234431-08:00 s19 kernel: ? __cgroup_account_cputime_field+0x41/0x80
2026-02-02T16:15:23.234431-08:00 s19 kernel: ? account_system_index_time+0x9a/0xd0
2026-02-02T16:15:23.234432-08:00 s19 kernel: ? tmigr_requires_handle_remote+0x8c/0x110
2026-02-02T16:15:23.234432-08:00 s19 kernel: update_process_times+0x72/0xd0
2026-02-02T16:15:23.234433-08:00 s19 kernel: tick_nohz_handler+0x97/0x1b0
2026-02-02T16:15:23.234433-08:00 s19 kernel: ? __pfx_tick_nohz_handler+0x10/0x10
2026-02-02T16:15:23.234434-08:00 s19 kernel: __hrtimer_run_queues+0x109/0x240
2026-02-02T16:15:23.234434-08:00 s19 kernel: hrtimer_interrupt+0xfd/0x260
2026-02-02T16:15:23.234435-08:00 s19 kernel: __sysvec_apic_timer_interrupt+0x56/0x130
2026-02-02T16:15:23.234436-08:00 s19 kernel: sysvec_apic_timer_interrupt+0x9b/0xc0
2026-02-02T16:15:23.234436-08:00 s19 kernel: </IRQ>
2026-02-02T16:15:23.234437-08:00 s19 kernel: <TASK>
2026-02-02T16:15:23.234437-08:00 s19 kernel: asm_sysvec_apic_timer_interrupt+0x1b/0x20
2026-02-02T16:15:23.234438-08:00 s19 kernel: RIP: 0010:vfs_write+0x2e0/0x480
2026-02-02T16:15:23.234438-08:00 s19 kernel: Code: 48 8b 45 a8 49 89 06 41 8b 45 04 25 00 00 00 06 3d 00 00 00 02 74 57 49 8b 7d 48 4c 8b 4f 30 49 8b 41 28 48 8b 80 b8 03 00 00 <48> 85 c0 74 3f 48 8b 40 08 48 85 c0 74 36 41 0f b7 01 49 8d 75 40
2026-02-02T16:15:23.234439-08:00 s19 kernel: RSP: 0018:ffffd0958814fb90 EFLAGS: 00000206
2026-02-02T16:15:23.234439-08:00 s19 kernel: RAX: ffff8922538a76e0 RBX: ffff892292845400 RCX: ffffd0958814fc30
2026-02-02T16:15:23.234440-08:00 s19 kernel: RDX: 0000000000000000 RSI: 00005ec7f3eb54a0 RDI: ffff8922405ad480
2026-02-02T16:15:23.234440-08:00 s19 kernel: RBP: ffffd0958814fc20 R08: 0000000000000000 R09: ffff892241aba798
2026-02-02T16:15:23.234686-08:00 s19 kernel: R10: 0000000000002000 R11: 0000000000000000 R12: 0000000000002000
2026-02-02T16:15:23.234688-08:00 s19 kernel: R13: ffff8922929dec00 R14: ffffd0958814fc30 R15: 00005ec7f3eb54a0
2026-02-02T16:15:23.234689-08:00 s19 kernel: ksys_write+0x71/0xf0
2026-02-02T16:15:23.234689-08:00 s19 kernel: __x64_sys_write+0x19/0x30
2026-02-02T16:15:23.234690-08:00 s19 kernel: x64_sys_call+0x259/0x26e0
2026-02-02T16:15:23.234690-08:00 s19 kernel: do_syscall_64+0x81/0x500
2026-02-02T16:15:23.234691-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:15:23.234691-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:15:23.234693-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:15:23.234694-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:15:23.234695-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:15:23.234695-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:15:23.234696-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:23.234696-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:15:23.234697-08:00 s19 kernel: ? vfs_write+0x324/0x480
2026-02-02T16:15:23.234698-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:15:23.234698-08:00 s19 kernel: ? ksys_write+0x71/0xf0
2026-02-02T16:15:23.234699-08:00 s19 kernel: ? __x64_sys_write+0x19/0x30
2026-02-02T16:15:23.234700-08:00 s19 kernel: ? x64_sys_call+0x259/0x26e0
2026-02-02T16:15:23.234700-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:23.234701-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:15:23.234701-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:15:23.234702-08:00 s19 kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e
2026-02-02T16:15:23.234703-08:00 s19 kernel: RIP: 0033:0x7a4931b1c5a4
2026-02-02T16:15:23.234703-08:00 s19 kernel: Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d a5 ea 0e 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89
2026-02-02T16:15:23.234704-08:00 s19 kernel: RSP: 002b:00007ffd835d42d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
2026-02-02T16:15:23.234704-08:00 s19 kernel: RAX: ffffffffffffffda RBX: 0000000000002000 RCX: 00007a4931b1c5a4
2026-02-02T16:15:23.234705-08:00 s19 kernel: RDX: 0000000000002000 RSI: 00005ec7f3eb54a0 RDI: 0000000000000001
2026-02-02T16:15:23.234706-08:00 s19 kernel: RBP: 00007ffd835d4330 R08: 00007a4931c03b20 R09: 0000000000000000
2026-02-02T16:15:23.234706-08:00 s19 kernel: R10: 0000000000000001 R11: 0000000000000202 R12: 0000000000002000
2026-02-02T16:15:23.234707-08:00 s19 kernel: R13: 00005ec7f3eb54a0 R14: 0000000000002000 R15: 0000000000002000
2026-02-02T16:15:23.234707-08:00 s19 kernel: </TASK>
2026-02-02T16:15:23.234708-08:00 s19 kernel: watchdog: BUG: soft lockup - CPU#6 stuck for 23s! [systemd-network:841]
2026-02-02T16:15:23.234708-08:00 s19 kernel: Modules linked in: tls snd_hda_codec_intelhdmi snd_hda_codec_alc882 snd_hda_codec_realtek_lib qrtr snd_hda_codec_generic snd_hda_intel snd_sof_pci_intel_cnl snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda snd_hda_codec_hdmi soundwire_cadence snd_sof_pci intel_rapl_msr snd_sof_xtensa_dsp intel_rapl_common bridge intel_uncore_frequency snd_sof stp intel_uncore_frequency_common llc snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation cfg80211 snd_soc_sdw_utils snd_soc_acpi soundwire_bus snd_soc_sdca crc8 snd_soc_avs snd_soc_hda_codec snd_hda_ext_core intel_tcc_cooling x86_pkg_temp_thermal snd_hda_codec intel_powerclamp coretemp snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep binfmt_misc kvm_intel cmdlinepart i915 snd_soc_core spi_nor snd_compress ee1004 mtd mei_hdcp mei_pxp ac97_bus drm_buddy snd_pcm_dmaengine kvm snd_pcm ttm irqbypass
2026-02-02T16:15:23.234742-08:00 s19 kernel: drm_display_helper i2c_i801 eeepc_wmi snd_timer rapl nls_iso8859_1 intel_cstate asus_wmi snd i2c_smbus platform_profile spi_intel_pci cec wmi_bmof i2c_mux mei_me soundcore intel_wmi_thunderbolt sparse_keymap mxm_wmi spi_intel rc_core mei i2c_algo_bit intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec acpi_pad acpi_tad joydev input_leds mac_hid sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b libblake2b raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 linear hid_generic usbhid hid nvme nvme_core nvme_keyring ghash_clmulni_intel nvme_auth intel_lpss_pci ahci igc intel_lpss hkdf libahci idma64 video wmi aesni_intel
2026-02-02T16:15:23.234743-08:00 s19 kernel: CPU: 6 UID: 998 PID: 841 Comm: systemd-network Tainted: G D 6.19.0-rc1-pz #1 PREEMPT(full)
2026-02-02T16:15:23.234743-08:00 s19 kernel: Tainted: [D]=DIE
2026-02-02T16:15:23.234744-08:00 s19 kernel: Hardware name: ASUS System Product Name/PRIME Z490-A, BIOS 9902 09/15/2021
2026-02-02T16:15:23.234744-08:00 s19 kernel: RIP: 0010:smp_call_function_many_cond+0x12c/0x590
2026-02-02T16:15:23.234745-08:00 s19 kernel: Code: 36 4c 63 e0 49 8b 5d 00 49 81 fc 00 20 00 00 0f 83 43 04 00 00 4a 03 1c e5 e0 50 d9 bb 8b 53 08 48 89 de 83 e2 01 74 0a f3 90 <8b> 4e 08 83 e1 01 75 f6 83 c0 01 eb b0 48 83 c4 50 5b 41 5c 41 5d
2026-02-02T16:15:23.234746-08:00 s19 kernel: RSP: 0018:ffffd09582a4b808 EFLAGS: 00000202
2026-02-02T16:15:23.234746-08:00 s19 kernel: RAX: 0000000000000000 RBX: ffff89298e03c900 RCX: 0000000000000001
2026-02-02T16:15:23.234747-08:00 s19 kernel: RDX: 0000000000000001 RSI: ffff89298e03c900 RDI: 0000000000000000
2026-02-02T16:15:23.234747-08:00 s19 kernel: RBP: ffffd09582a4b880 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:15:23.234748-08:00 s19 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
2026-02-02T16:15:23.234748-08:00 s19 kernel: R13: ffff89298e334300 R14: 0000000000000006 R15: 0000000000000006
2026-02-02T16:15:23.234749-08:00 s19 kernel: FS: 0000000000000000(0000) GS:ffff8929d1957000(0000) knlGS:0000000000000000
2026-02-02T16:15:23.234749-08:00 s19 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-02-02T16:15:23.234750-08:00 s19 kernel: CR2: 000070f72bb90030 CR3: 0000000174642006 CR4: 00000000007726f0
2026-02-02T16:15:23.234750-08:00 s19 kernel: PKRU: 55555554
2026-02-02T16:15:23.234751-08:00 s19 kernel: Call Trace:
2026-02-02T16:15:23.234751-08:00 s19 kernel: <TASK>
2026-02-02T16:15:23.234752-08:00 s19 kernel: ? __pfx_flush_tlb_func+0x10/0x10
2026-02-02T16:15:23.234753-08:00 s19 kernel: on_each_cpu_cond_mask+0x24/0x60
2026-02-02T16:15:23.234753-08:00 s19 kernel: native_flush_tlb_multi+0x73/0x170
2026-02-02T16:15:23.234754-08:00 s19 kernel: flush_tlb_mm_range+0x2d8/0x790
2026-02-02T16:15:23.234754-08:00 s19 kernel: tlb_finish_mmu+0x12f/0x1b0
2026-02-02T16:15:23.234755-08:00 s19 kernel: exit_mmap+0x192/0x3f0
2026-02-02T16:15:23.234755-08:00 s19 kernel: __mmput+0x41/0x150
2026-02-02T16:15:23.234756-08:00 s19 kernel: mmput+0x31/0x40
2026-02-02T16:15:23.234756-08:00 s19 kernel: do_exit+0x276/0xa40
2026-02-02T16:15:23.234757-08:00 s19 kernel: ? collect_signal+0xb0/0x150
2026-02-02T16:15:23.234757-08:00 s19 kernel: do_group_exit+0x34/0x90
2026-02-02T16:15:23.234758-08:00 s19 kernel: get_signal+0x926/0x950
2026-02-02T16:15:23.234758-08:00 s19 kernel: arch_do_signal_or_restart+0x41/0x240
2026-02-02T16:15:23.234759-08:00 s19 kernel: exit_to_user_mode_loop+0x8e/0x520
2026-02-02T16:15:23.234759-08:00 s19 kernel: do_syscall_64+0x2ab/0x500
2026-02-02T16:15:23.234760-08:00 s19 kernel: ? __do_sys_gettid+0x1a/0x30
2026-02-02T16:15:23.234760-08:00 s19 kernel: ? x64_sys_call+0x72d/0x26e0
2026-02-02T16:15:23.234761-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:23.234761-08:00 s19 kernel: ? __x64_sys_close+0x3e/0x90
2026-02-02T16:15:23.234762-08:00 s19 kernel: ? x64_sys_call+0x1b7c/0x26e0
2026-02-02T16:15:23.234763-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:23.234763-08:00 s19 kernel: ? __sys_sendmsg+0x8c/0x100
2026-02-02T16:15:23.234764-08:00 s19 kernel: ? __x64_sys_sendmsg+0x1d/0x30
2026-02-02T16:15:23.234764-08:00 s19 kernel: ? x64_sys_call+0x25cc/0x26e0
2026-02-02T16:15:23.234765-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:23.234765-08:00 s19 kernel: ? __do_sys_gettid+0x1a/0x30
2026-02-02T16:15:23.234766-08:00 s19 kernel: ? x64_sys_call+0x72d/0x26e0
2026-02-02T16:15:23.234766-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:23.234767-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:15:23.234767-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:15:23.234768-08:00 s19 kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e
2026-02-02T16:15:23.234769-08:00 s19 kernel: RIP: 0033:0x7fca8d52a037
2026-02-02T16:15:23.234769-08:00 s19 kernel: Code: Unable to access opcode bytes at 0x7fca8d52a00d.
2026-02-02T16:15:23.234770-08:00 s19 kernel: RSP: 002b:00007ffd2688e2f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
2026-02-02T16:15:23.234770-08:00 s19 kernel: RAX: fffffffffffffffc RBX: 0000000000000022 RCX: 00007fca8d52a037
2026-02-02T16:15:23.234771-08:00 s19 kernel: RDX: 0000000000000022 RSI: 000064ecd6897d00 RDI: 0000000000000005
2026-02-02T16:15:23.234771-08:00 s19 kernel: RBP: 00007ffd2688e410 R08: 0000000000000000 R09: 0000000000000005
2026-02-02T16:15:23.234772-08:00 s19 kernel: R10: 00000000ffffffff R11: 0000000000000202 R12: 000064ecd6897d00
2026-02-02T16:15:23.234772-08:00 s19 kernel: R13: 0000000000000018 R14: 000064ecd6873c70 R15: ffffffffffffffff
2026-02-02T16:15:23.234773-08:00 s19 kernel: </TASK>
2026-02-02T16:15:51.234381-08:00 s19 kernel: watchdog: BUG: soft lockup - CPU#6 stuck for 49s! [systemd-network:841]
2026-02-02T16:15:51.234617-08:00 s19 kernel: Modules linked in: tls snd_hda_codec_intelhdmi snd_hda_codec_alc882 snd_hda_codec_realtek_lib qrtr snd_hda_codec_generic snd_hda_intel snd_sof_pci_intel_cnl snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda snd_hda_codec_hdmi soundwire_cadence snd_sof_pci intel_rapl_msr snd_sof_xtensa_dsp intel_rapl_common bridge intel_uncore_frequency snd_sof stp intel_uncore_frequency_common llc snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation cfg80211 snd_soc_sdw_utils snd_soc_acpi soundwire_bus snd_soc_sdca crc8 snd_soc_avs snd_soc_hda_codec snd_hda_ext_core intel_tcc_cooling x86_pkg_temp_thermal snd_hda_codec intel_powerclamp coretemp snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep binfmt_misc kvm_intel cmdlinepart i915 snd_soc_core spi_nor snd_compress ee1004 mtd mei_hdcp mei_pxp ac97_bus drm_buddy snd_pcm_dmaengine kvm snd_pcm ttm irqbypass
2026-02-02T16:15:51.234623-08:00 s19 kernel: drm_display_helper i2c_i801 eeepc_wmi snd_timer rapl nls_iso8859_1 intel_cstate asus_wmi snd i2c_smbus platform_profile spi_intel_pci cec wmi_bmof i2c_mux mei_me soundcore intel_wmi_thunderbolt sparse_keymap mxm_wmi spi_intel rc_core mei i2c_algo_bit intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec acpi_pad acpi_tad joydev input_leds mac_hid sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b libblake2b raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 linear hid_generic usbhid hid nvme nvme_core nvme_keyring ghash_clmulni_intel nvme_auth intel_lpss_pci ahci igc intel_lpss hkdf libahci idma64 video wmi aesni_intel
2026-02-02T16:15:51.234624-08:00 s19 kernel: CPU: 6 UID: 998 PID: 841 Comm: systemd-network Tainted: G D L 6.19.0-rc1-pz #1 PREEMPT(full)
2026-02-02T16:15:51.234624-08:00 s19 kernel: Tainted: [D]=DIE, [L]=SOFTLOCKUP
2026-02-02T16:15:51.234625-08:00 s19 kernel: Hardware name: ASUS System Product Name/PRIME Z490-A, BIOS 9902 09/15/2021
2026-02-02T16:15:51.234626-08:00 s19 kernel: RIP: 0010:smp_call_function_many_cond+0x12c/0x590
2026-02-02T16:15:51.234626-08:00 s19 kernel: Code: 36 4c 63 e0 49 8b 5d 00 49 81 fc 00 20 00 00 0f 83 43 04 00 00 4a 03 1c e5 e0 50 d9 bb 8b 53 08 48 89 de 83 e2 01 74 0a f3 90 <8b> 4e 08 83 e1 01 75 f6 83 c0 01 eb b0 48 83 c4 50 5b 41 5c 41 5d
2026-02-02T16:15:51.234627-08:00 s19 kernel: RSP: 0018:ffffd09582a4b808 EFLAGS: 00000202
2026-02-02T16:15:51.234627-08:00 s19 kernel: RAX: 0000000000000000 RBX: ffff89298e03c900 RCX: 0000000000000001
2026-02-02T16:15:51.234628-08:00 s19 kernel: RDX: 0000000000000001 RSI: ffff89298e03c900 RDI: 0000000000000000
2026-02-02T16:15:51.234629-08:00 s19 kernel: RBP: ffffd09582a4b880 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:15:51.234629-08:00 s19 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
2026-02-02T16:15:51.234630-08:00 s19 kernel: R13: ffff89298e334300 R14: 0000000000000006 R15: 0000000000000006
2026-02-02T16:15:51.234630-08:00 s19 kernel: FS: 0000000000000000(0000) GS:ffff8929d1957000(0000) knlGS:0000000000000000
2026-02-02T16:15:51.234631-08:00 s19 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-02-02T16:15:51.234632-08:00 s19 kernel: CR2: 000070f72bb90030 CR3: 0000000174642006 CR4: 00000000007726f0
2026-02-02T16:15:51.234632-08:00 s19 kernel: PKRU: 55555554
2026-02-02T16:15:51.234633-08:00 s19 kernel: Call Trace:
2026-02-02T16:15:51.234633-08:00 s19 kernel: <TASK>
2026-02-02T16:15:51.234634-08:00 s19 kernel: ? __pfx_flush_tlb_func+0x10/0x10
2026-02-02T16:15:51.234634-08:00 s19 kernel: on_each_cpu_cond_mask+0x24/0x60
2026-02-02T16:15:51.234635-08:00 s19 kernel: native_flush_tlb_multi+0x73/0x170
2026-02-02T16:15:51.234635-08:00 s19 kernel: flush_tlb_mm_range+0x2d8/0x790
2026-02-02T16:15:51.234636-08:00 s19 kernel: tlb_finish_mmu+0x12f/0x1b0
2026-02-02T16:15:51.234636-08:00 s19 kernel: exit_mmap+0x192/0x3f0
2026-02-02T16:15:51.234637-08:00 s19 kernel: __mmput+0x41/0x150
2026-02-02T16:15:51.234637-08:00 s19 kernel: mmput+0x31/0x40
2026-02-02T16:15:51.234638-08:00 s19 kernel: do_exit+0x276/0xa40
2026-02-02T16:15:51.234638-08:00 s19 kernel: ? collect_signal+0xb0/0x150
2026-02-02T16:15:51.234639-08:00 s19 kernel: do_group_exit+0x34/0x90
2026-02-02T16:15:51.234639-08:00 s19 kernel: get_signal+0x926/0x950
2026-02-02T16:15:51.234640-08:00 s19 kernel: arch_do_signal_or_restart+0x41/0x240
2026-02-02T16:15:51.234640-08:00 s19 kernel: exit_to_user_mode_loop+0x8e/0x520
2026-02-02T16:15:51.234641-08:00 s19 kernel: do_syscall_64+0x2ab/0x500
2026-02-02T16:15:51.234641-08:00 s19 kernel: ? __do_sys_gettid+0x1a/0x30
2026-02-02T16:15:51.234642-08:00 s19 kernel: ? x64_sys_call+0x72d/0x26e0
2026-02-02T16:15:51.234642-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:51.234643-08:00 s19 kernel: ? __x64_sys_close+0x3e/0x90
2026-02-02T16:15:51.234643-08:00 s19 kernel: ? x64_sys_call+0x1b7c/0x26e0
2026-02-02T16:15:51.234644-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:51.234644-08:00 s19 kernel: ? __sys_sendmsg+0x8c/0x100
2026-02-02T16:15:51.234645-08:00 s19 kernel: ? __x64_sys_sendmsg+0x1d/0x30
2026-02-02T16:15:51.234646-08:00 s19 kernel: ? x64_sys_call+0x25cc/0x26e0
2026-02-02T16:15:51.234646-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:51.234647-08:00 s19 kernel: ? __do_sys_gettid+0x1a/0x30
2026-02-02T16:15:51.234647-08:00 s19 kernel: ? x64_sys_call+0x72d/0x26e0
2026-02-02T16:15:51.234648-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:15:51.234648-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:15:51.234649-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:15:51.234650-08:00 s19 kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e
2026-02-02T16:15:51.234651-08:00 s19 kernel: RIP: 0033:0x7fca8d52a037
2026-02-02T16:15:51.234652-08:00 s19 kernel: Code: Unable to access opcode bytes at 0x7fca8d52a00d.
2026-02-02T16:15:51.234652-08:00 s19 kernel: RSP: 002b:00007ffd2688e2f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
2026-02-02T16:15:51.234653-08:00 s19 kernel: RAX: fffffffffffffffc RBX: 0000000000000022 RCX: 00007fca8d52a037
2026-02-02T16:15:51.234653-08:00 s19 kernel: RDX: 0000000000000022 RSI: 000064ecd6897d00 RDI: 0000000000000005
2026-02-02T16:15:51.234654-08:00 s19 kernel: RBP: 00007ffd2688e410 R08: 0000000000000000 R09: 0000000000000005
2026-02-02T16:15:51.234654-08:00 s19 kernel: R10: 00000000ffffffff R11: 0000000000000202 R12: 000064ecd6897d00
2026-02-02T16:15:51.234655-08:00 s19 kernel: R13: 0000000000000018 R14: 000064ecd6873c70 R15: ffffffffffffffff
2026-02-02T16:15:51.234656-08:00 s19 kernel: </TASK>
2026-02-02T16:16:19.234349-08:00 s19 kernel: watchdog: BUG: soft lockup - CPU#6 stuck for 75s! [systemd-network:841]
2026-02-02T16:16:19.234390-08:00 s19 kernel: Modules linked in: tls snd_hda_codec_intelhdmi snd_hda_codec_alc882 snd_hda_codec_realtek_lib qrtr snd_hda_codec_generic snd_hda_intel snd_sof_pci_intel_cnl snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda snd_hda_codec_hdmi soundwire_cadence snd_sof_pci intel_rapl_msr snd_sof_xtensa_dsp intel_rapl_common bridge intel_uncore_frequency snd_sof stp intel_uncore_frequency_common llc snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation cfg80211 snd_soc_sdw_utils snd_soc_acpi soundwire_bus snd_soc_sdca crc8 snd_soc_avs snd_soc_hda_codec snd_hda_ext_core intel_tcc_cooling x86_pkg_temp_thermal snd_hda_codec intel_powerclamp coretemp snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep binfmt_misc kvm_intel cmdlinepart i915 snd_soc_core spi_nor snd_compress ee1004 mtd mei_hdcp mei_pxp ac97_bus drm_buddy snd_pcm_dmaengine kvm snd_pcm ttm irqbypass
2026-02-02T16:16:19.234392-08:00 s19 kernel: drm_display_helper i2c_i801 eeepc_wmi snd_timer rapl nls_iso8859_1 intel_cstate asus_wmi snd i2c_smbus platform_profile spi_intel_pci cec wmi_bmof i2c_mux mei_me soundcore intel_wmi_thunderbolt sparse_keymap mxm_wmi spi_intel rc_core mei i2c_algo_bit intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec acpi_pad acpi_tad joydev input_leds mac_hid sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b libblake2b raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 linear hid_generic usbhid hid nvme nvme_core nvme_keyring ghash_clmulni_intel nvme_auth intel_lpss_pci ahci igc intel_lpss hkdf libahci idma64 video wmi aesni_intel
2026-02-02T16:16:19.234393-08:00 s19 kernel: CPU: 6 UID: 998 PID: 841 Comm: systemd-network Tainted: G D L 6.19.0-rc1-pz #1 PREEMPT(full)
2026-02-02T16:16:19.234393-08:00 s19 kernel: Tainted: [D]=DIE, [L]=SOFTLOCKUP
2026-02-02T16:16:19.234394-08:00 s19 kernel: Hardware name: ASUS System Product Name/PRIME Z490-A, BIOS 9902 09/15/2021
2026-02-02T16:16:19.234394-08:00 s19 kernel: RIP: 0010:smp_call_function_many_cond+0x12c/0x590
2026-02-02T16:16:19.234395-08:00 s19 kernel: Code: 36 4c 63 e0 49 8b 5d 00 49 81 fc 00 20 00 00 0f 83 43 04 00 00 4a 03 1c e5 e0 50 d9 bb 8b 53 08 48 89 de 83 e2 01 74 0a f3 90 <8b> 4e 08 83 e1 01 75 f6 83 c0 01 eb b0 48 83 c4 50 5b 41 5c 41 5d
2026-02-02T16:16:19.234396-08:00 s19 kernel: RSP: 0018:ffffd09582a4b808 EFLAGS: 00000202
2026-02-02T16:16:19.234396-08:00 s19 kernel: RAX: 0000000000000000 RBX: ffff89298e03c900 RCX: 0000000000000001
2026-02-02T16:16:19.234397-08:00 s19 kernel: RDX: 0000000000000001 RSI: ffff89298e03c900 RDI: 0000000000000000
2026-02-02T16:16:19.234398-08:00 s19 kernel: RBP: ffffd09582a4b880 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:16:19.234398-08:00 s19 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
2026-02-02T16:16:19.234399-08:00 s19 kernel: R13: ffff89298e334300 R14: 0000000000000006 R15: 0000000000000006
2026-02-02T16:16:19.234399-08:00 s19 kernel: FS: 0000000000000000(0000) GS:ffff8929d1957000(0000) knlGS:0000000000000000
2026-02-02T16:16:19.234400-08:00 s19 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-02-02T16:16:19.234400-08:00 s19 kernel: CR2: 000070f72bb90030 CR3: 0000000174642006 CR4: 00000000007726f0
2026-02-02T16:16:19.234401-08:00 s19 kernel: PKRU: 55555554
2026-02-02T16:16:19.234401-08:00 s19 kernel: Call Trace:
2026-02-02T16:16:19.234402-08:00 s19 kernel: <TASK>
2026-02-02T16:16:19.234402-08:00 s19 kernel: ? __pfx_flush_tlb_func+0x10/0x10
2026-02-02T16:16:19.234403-08:00 s19 kernel: on_each_cpu_cond_mask+0x24/0x60
2026-02-02T16:16:19.234404-08:00 s19 kernel: native_flush_tlb_multi+0x73/0x170
2026-02-02T16:16:19.234404-08:00 s19 kernel: flush_tlb_mm_range+0x2d8/0x790
2026-02-02T16:16:19.234405-08:00 s19 kernel: tlb_finish_mmu+0x12f/0x1b0
2026-02-02T16:16:19.234405-08:00 s19 kernel: exit_mmap+0x192/0x3f0
2026-02-02T16:16:19.234406-08:00 s19 kernel: __mmput+0x41/0x150
2026-02-02T16:16:19.234406-08:00 s19 kernel: mmput+0x31/0x40
2026-02-02T16:16:19.234407-08:00 s19 kernel: do_exit+0x276/0xa40
2026-02-02T16:16:19.234407-08:00 s19 kernel: ? collect_signal+0xb0/0x150
2026-02-02T16:16:19.234408-08:00 s19 kernel: do_group_exit+0x34/0x90
2026-02-02T16:16:19.234408-08:00 s19 kernel: get_signal+0x926/0x950
2026-02-02T16:16:19.234409-08:00 s19 kernel: arch_do_signal_or_restart+0x41/0x240
2026-02-02T16:16:19.234409-08:00 s19 kernel: exit_to_user_mode_loop+0x8e/0x520
2026-02-02T16:16:19.234410-08:00 s19 kernel: do_syscall_64+0x2ab/0x500
2026-02-02T16:16:19.234410-08:00 s19 kernel: ? __do_sys_gettid+0x1a/0x30
2026-02-02T16:16:19.234411-08:00 s19 kernel: ? x64_sys_call+0x72d/0x26e0
2026-02-02T16:16:19.234412-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:16:19.234412-08:00 s19 kernel: ? __x64_sys_close+0x3e/0x90
2026-02-02T16:16:19.234413-08:00 s19 kernel: ? x64_sys_call+0x1b7c/0x26e0
2026-02-02T16:16:19.234413-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:16:19.234414-08:00 s19 kernel: ? __sys_sendmsg+0x8c/0x100
2026-02-02T16:16:19.234414-08:00 s19 kernel: ? __x64_sys_sendmsg+0x1d/0x30
2026-02-02T16:16:19.234415-08:00 s19 kernel: ? x64_sys_call+0x25cc/0x26e0
2026-02-02T16:16:19.234415-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:16:19.234416-08:00 s19 kernel: ? __do_sys_gettid+0x1a/0x30
2026-02-02T16:16:19.234416-08:00 s19 kernel: ? x64_sys_call+0x72d/0x26e0
2026-02-02T16:16:19.234417-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:16:19.234417-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:16:19.234418-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:16:19.234419-08:00 s19 kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e
2026-02-02T16:16:19.234420-08:00 s19 kernel: RIP: 0033:0x7fca8d52a037
2026-02-02T16:16:19.234420-08:00 s19 kernel: Code: Unable to access opcode bytes at 0x7fca8d52a00d.
2026-02-02T16:16:19.234421-08:00 s19 kernel: RSP: 002b:00007ffd2688e2f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
2026-02-02T16:16:19.234422-08:00 s19 kernel: RAX: fffffffffffffffc RBX: 0000000000000022 RCX: 00007fca8d52a037
2026-02-02T16:16:19.234422-08:00 s19 kernel: RDX: 0000000000000022 RSI: 000064ecd6897d00 RDI: 0000000000000005
2026-02-02T16:16:19.234423-08:00 s19 kernel: RBP: 00007ffd2688e410 R08: 0000000000000000 R09: 0000000000000005
2026-02-02T16:16:19.234423-08:00 s19 kernel: R10: 00000000ffffffff R11: 0000000000000202 R12: 000064ecd6897d00
2026-02-02T16:16:19.234424-08:00 s19 kernel: R13: 0000000000000018 R14: 000064ecd6873c70 R15: ffffffffffffffff
2026-02-02T16:16:19.234424-08:00 s19 kernel: </TASK>
2026-02-02T16:16:33.241297-08:00 s19 kernel: rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P12753 P6509 P5261 P15769 P8594 P5431 P10107 P14333 P6906 } 241738 jiffies s: 873 root: 0x0/T
2026-02-02T16:16:33.241336-08:00 s19 kernel: rcu: blocking rcu_node structures (internal RCU debug):
2026-02-02T16:16:47.234360-08:00 s19 kernel: watchdog: BUG: soft lockup - CPU#6 stuck for 101s! [systemd-network:841]
2026-02-02T16:16:47.234400-08:00 s19 kernel: Modules linked in: tls snd_hda_codec_intelhdmi snd_hda_codec_alc882 snd_hda_codec_realtek_lib qrtr snd_hda_codec_generic snd_hda_intel snd_sof_pci_intel_cnl snd_sof_intel_hda_generic soundwire_intel snd_sof_intel_hda_sdw_bpt snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_intel_hda_mlink snd_sof_intel_hda snd_hda_codec_hdmi soundwire_cadence snd_sof_pci intel_rapl_msr snd_sof_xtensa_dsp intel_rapl_common bridge intel_uncore_frequency snd_sof stp intel_uncore_frequency_common llc snd_sof_utils snd_soc_acpi_intel_match snd_soc_acpi_intel_sdca_quirks soundwire_generic_allocation cfg80211 snd_soc_sdw_utils snd_soc_acpi soundwire_bus snd_soc_sdca crc8 snd_soc_avs snd_soc_hda_codec snd_hda_ext_core intel_tcc_cooling x86_pkg_temp_thermal snd_hda_codec intel_powerclamp coretemp snd_hda_core snd_intel_dspcfg snd_intel_sdw_acpi snd_hwdep binfmt_misc kvm_intel cmdlinepart i915 snd_soc_core spi_nor snd_compress ee1004 mtd mei_hdcp mei_pxp ac97_bus drm_buddy snd_pcm_dmaengine kvm snd_pcm ttm irqbypass
2026-02-02T16:16:47.234402-08:00 s19 kernel: drm_display_helper i2c_i801 eeepc_wmi snd_timer rapl nls_iso8859_1 intel_cstate asus_wmi snd i2c_smbus platform_profile spi_intel_pci cec wmi_bmof i2c_mux mei_me soundcore intel_wmi_thunderbolt sparse_keymap mxm_wmi spi_intel rc_core mei i2c_algo_bit intel_pmc_core pmt_telemetry pmt_discovery pmt_class intel_pmc_ssram_telemetry intel_vsec acpi_pad acpi_tad joydev input_leds mac_hid sch_fq_codel dm_multipath msr nvme_fabrics efi_pstore nfnetlink dmi_sysfs ip_tables x_tables autofs4 btrfs blake2b libblake2b raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 linear hid_generic usbhid hid nvme nvme_core nvme_keyring ghash_clmulni_intel nvme_auth intel_lpss_pci ahci igc intel_lpss hkdf libahci idma64 video wmi aesni_intel
2026-02-02T16:16:47.234403-08:00 s19 kernel: CPU: 6 UID: 998 PID: 841 Comm: systemd-network Tainted: G D L 6.19.0-rc1-pz #1 PREEMPT(full)
2026-02-02T16:16:47.234404-08:00 s19 kernel: Tainted: [D]=DIE, [L]=SOFTLOCKUP
2026-02-02T16:16:47.234405-08:00 s19 kernel: Hardware name: ASUS System Product Name/PRIME Z490-A, BIOS 9902 09/15/2021
2026-02-02T16:16:47.234405-08:00 s19 kernel: RIP: 0010:smp_call_function_many_cond+0x12c/0x590
2026-02-02T16:16:47.234406-08:00 s19 kernel: Code: 36 4c 63 e0 49 8b 5d 00 49 81 fc 00 20 00 00 0f 83 43 04 00 00 4a 03 1c e5 e0 50 d9 bb 8b 53 08 48 89 de 83 e2 01 74 0a f3 90 <8b> 4e 08 83 e1 01 75 f6 83 c0 01 eb b0 48 83 c4 50 5b 41 5c 41 5d
2026-02-02T16:16:47.234407-08:00 s19 kernel: RSP: 0018:ffffd09582a4b808 EFLAGS: 00000202
2026-02-02T16:16:47.234407-08:00 s19 kernel: RAX: 0000000000000000 RBX: ffff89298e03c900 RCX: 0000000000000001
2026-02-02T16:16:47.234408-08:00 s19 kernel: RDX: 0000000000000001 RSI: ffff89298e03c900 RDI: 0000000000000000
2026-02-02T16:16:47.234408-08:00 s19 kernel: RBP: ffffd09582a4b880 R08: 0000000000000000 R09: 0000000000000000
2026-02-02T16:16:47.234409-08:00 s19 kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
2026-02-02T16:16:47.234410-08:00 s19 kernel: R13: ffff89298e334300 R14: 0000000000000006 R15: 0000000000000006
2026-02-02T16:16:47.234410-08:00 s19 kernel: FS: 0000000000000000(0000) GS:ffff8929d1957000(0000) knlGS:0000000000000000
2026-02-02T16:16:47.234411-08:00 s19 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2026-02-02T16:16:47.234411-08:00 s19 kernel: CR2: 000070f72bb90030 CR3: 0000000174642006 CR4: 00000000007726f0
2026-02-02T16:16:47.234412-08:00 s19 kernel: PKRU: 55555554
2026-02-02T16:16:47.234412-08:00 s19 kernel: Call Trace:
2026-02-02T16:16:47.234413-08:00 s19 kernel: <TASK>
2026-02-02T16:16:47.234413-08:00 s19 kernel: ? __pfx_flush_tlb_func+0x10/0x10
2026-02-02T16:16:47.234414-08:00 s19 kernel: on_each_cpu_cond_mask+0x24/0x60
2026-02-02T16:16:47.234414-08:00 s19 kernel: native_flush_tlb_multi+0x73/0x170
2026-02-02T16:16:47.234415-08:00 s19 kernel: flush_tlb_mm_range+0x2d8/0x790
2026-02-02T16:16:47.234416-08:00 s19 kernel: tlb_finish_mmu+0x12f/0x1b0
2026-02-02T16:16:47.234416-08:00 s19 kernel: exit_mmap+0x192/0x3f0
2026-02-02T16:16:47.234417-08:00 s19 kernel: __mmput+0x41/0x150
2026-02-02T16:16:47.234417-08:00 s19 kernel: mmput+0x31/0x40
2026-02-02T16:16:47.234418-08:00 s19 kernel: do_exit+0x276/0xa40
2026-02-02T16:16:47.234418-08:00 s19 kernel: ? collect_signal+0xb0/0x150
2026-02-02T16:16:47.234419-08:00 s19 kernel: do_group_exit+0x34/0x90
2026-02-02T16:16:47.234419-08:00 s19 kernel: get_signal+0x926/0x950
2026-02-02T16:16:47.234420-08:00 s19 kernel: arch_do_signal_or_restart+0x41/0x240
2026-02-02T16:16:47.234420-08:00 s19 kernel: exit_to_user_mode_loop+0x8e/0x520
2026-02-02T16:16:47.234421-08:00 s19 kernel: do_syscall_64+0x2ab/0x500
2026-02-02T16:16:47.234421-08:00 s19 kernel: ? __do_sys_gettid+0x1a/0x30
2026-02-02T16:16:47.234422-08:00 s19 kernel: ? x64_sys_call+0x72d/0x26e0
2026-02-02T16:16:47.234422-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:16:47.234423-08:00 s19 kernel: ? __x64_sys_close+0x3e/0x90
2026-02-02T16:16:47.234423-08:00 s19 kernel: ? x64_sys_call+0x1b7c/0x26e0
2026-02-02T16:16:47.234424-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:16:47.234424-08:00 s19 kernel: ? __sys_sendmsg+0x8c/0x100
2026-02-02T16:16:47.234425-08:00 s19 kernel: ? __x64_sys_sendmsg+0x1d/0x30
2026-02-02T16:16:47.234425-08:00 s19 kernel: ? x64_sys_call+0x25cc/0x26e0
2026-02-02T16:16:47.234426-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:16:47.234426-08:00 s19 kernel: ? __do_sys_gettid+0x1a/0x30
2026-02-02T16:16:47.234427-08:00 s19 kernel: ? x64_sys_call+0x72d/0x26e0
2026-02-02T16:16:47.234427-08:00 s19 kernel: ? do_syscall_64+0xbf/0x500
2026-02-02T16:16:47.234431-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:16:47.234432-08:00 s19 kernel: ? clear_bhb_loop+0x30/0x80
2026-02-02T16:16:47.234433-08:00 s19 kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e
2026-02-02T16:16:47.234434-08:00 s19 kernel: RIP: 0033:0x7fca8d52a037
2026-02-02T16:16:47.234434-08:00 s19 kernel: Code: Unable to access opcode bytes at 0x7fca8d52a00d.
2026-02-02T16:16:47.234435-08:00 s19 kernel: RSP: 002b:00007ffd2688e2f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
2026-02-02T16:16:47.234436-08:00 s19 kernel: RAX: fffffffffffffffc RBX: 0000000000000022 RCX: 00007fca8d52a037
2026-02-02T16:16:47.234436-08:00 s19 kernel: RDX: 0000000000000022 RSI: 000064ecd6897d00 RDI: 0000000000000005
2026-02-02T16:16:47.234437-08:00 s19 kernel: RBP: 00007ffd2688e410 R08: 0000000000000000 R09: 0000000000000005
2026-02-02T16:16:47.234437-08:00 s19 kernel: R10: 00000000ffffffff R11: 0000000000000202 R12: 000064ecd6897d00
2026-02-02T16:16:47.234438-08:00 s19 kernel: R13: 0000000000000018 R14: 000064ecd6873c70 R15: ffffffffffffffff
2026-02-02T16:16:47.234438-08:00 s19 kernel: </TASK>
2026-02-02T19:58:31.230818-08:00 s19 kernel: Linux version 6.19.0-rc1-pz (doug@s19) (gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0, GNU ld (GNU Binutils for Ubuntu) 2.42) #1 SMP PREEMPT_DYNAMIC Fri Jan 30 11:33:51 PST 2026
2026-02-02T19:58:31.230822-08:00 s19 kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-6.19.0-rc1-pz root=UUID=823b5f2c-38f5-4b05-92f6-6cb77b157c8a ro ipv6.disable=1 consoleblank=300 msr.allow_writes=on cpuidle.governor=teo
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-03 16:36 ` Doug Smythies
@ 2026-02-10 18:13 ` Peter Zijlstra
2026-02-11 5:51 ` Doug Smythies
0 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-10 18:13 UTC (permalink / raw)
To: Doug Smythies
Cc: 'K Prateek Nayak', mingo, juri.lelli, vincent.guittot,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Tue, Feb 03, 2026 at 08:36:41AM -0800, Doug Smythies wrote:
> Further to my email from the other day, where all was good [1],
> I have continued to test, in particular the severe overload conditions
> from [2].
> Conditions:
> Greater than 12,500 X (yes > /dev/null) tasks
> But less than 15,000 X ( yes > /dev/null) tasks
>
> I have tested up to 20,000 X (yes > /dev/null) tasks
> with previous kernels, including mainline 6.19-rc1.
>
> I would not disagree if you say my operating conditions
> are ridiculous.
They absolutely are; however!, people do crazy things so I doubt you are
alone.
> System:
> Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz, 6 cores 12 CPUs.
> CPU frequency scaling driver: intel_pstate; Governor powersave.
Right, so I was too lazy to find a matching test machine, but instead
used taskset to limit myself to 6 cores/12 threads and let it rip.
# taskset -c -p 0-5,24-29 $$
# for ((i=0; i<20000; i++)) do yes > /dev/null & done
... a *LONG* while later ...
And I have reached 15k.
... this is *SLOW* ...
So I reached 20000 and figured what the heck and went for another 5k.
Eventually I managed to reach 21160, and then boom.
It is one of those pick_next_task_fair() NULL pointer derefs that are so
very indicative of math overflow.
I'll try and have a poke, if only this were a faster thing ;-)
^ permalink raw reply [flat|nested] 70+ messages in thread
* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 18:13 ` Peter Zijlstra
@ 2026-02-11 5:51 ` Doug Smythies
0 siblings, 0 replies; 70+ messages in thread
From: Doug Smythies @ 2026-02-11 5:51 UTC (permalink / raw)
To: 'Peter Zijlstra'
Cc: 'K Prateek Nayak', mingo, juri.lelli, vincent.guittot,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, Doug Smythies
[-- Attachment #1: Type: text/plain, Size: 1898 bytes --]
On 2026.02.10 10:13 Peter Zijlstra wrote:
> On Tue, Feb 03, 2026 at 08:36:41AM -0800, Doug Smythies wrote:
>
>> Further to my email from the other day, where all was good [1],
>> I have continued to test, in particular the severe overload conditions
>> from [2].
>
>> Conditions:
>> Greater than 12,500 X (yes > /dev/null) tasks
>> But less than 15,000 X ( yes > /dev/null) tasks
>>
>> I have tested up to 20,000 X (yes > /dev/null) tasks
>> with previous kernels, including mainline 6.19-rc1.
>>
>> I would not disagree if you say my operating conditions
>> are ridiculous.
>
> They absolutely are; however!, people do crazy things so I doubt you are
> alone.
>
>> System:
>> Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz, 6 cores 12 CPUs.
>> CPU frequency scaling driver: intel_pstate; Governor powersave.
>
> Right, so I was too lazy to find a matching test machine, but instead
> used taskset to limit myself to 6 cores/12 threads and let it rip.
>
> # taskset -c -p 0-5,24-29 $$
> # for ((i=0; i<20000; i++)) do yes > /dev/null & done
>
> ... a *LONG* while later ...
>
> And I have reached 15k.
>
> ... this is *SLOW* ...
Thanks for trying it.
And yes it gets very slow. I should have warned readers.
With the first version of this patch set it took my computer 20 minutes
to spin out 18,000 tasks. A graph is attached.
Note that more typically I could not get to 18,000 tasks. I don't know a
predictable way to create the hang.
By the way, I had no issue with 80,000 tasks, if they contained some
regular sleep time. A graph is attached. The load average was 79,400.
> So I reached 20000 and figured what the heck and went for another 5k.
>
> Eventually I managed to reach 21160, and then boom.
>
> It is one of those pick_next_task_fair() NULL pointer derefs that are so
> very indicative of math overflow.
>
> I'll try and have a poke, if only this were a faster thing ;-)
[-- Attachment #2: pz-tasks.png --]
[-- Type: image/png, Size: 17326 bytes --]
[-- Attachment #3: tasks-80000.png --]
[-- Type: image/png, Size: 25273 bytes --]
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-03 12:19 ` K Prateek Nayak
2026-02-03 16:36 ` Doug Smythies
@ 2026-02-04 10:15 ` K Prateek Nayak
2026-02-09 15:47 ` Peter Zijlstra
2026-02-04 10:44 ` Peter Zijlstra
2 siblings, 1 reply; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-04 10:15 UTC (permalink / raw)
To: Peter Zijlstra
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
[-- Attachment #1: Type: text/plain, Size: 6512 bytes --]
Hello Peter,
On 2/3/2026 5:49 PM, K Prateek Nayak wrote:
>> I'm not sure I have valuable tracing patches, I just stick random
>> trace_printk()s in.
>
> I'll plop those in and update once the I get a log for sum_shift++.
Here is one set of log:
# schbench enqueue
schbench-103551 [255] ... : place_entity: Placed se: weight(1048576) vruntime(722711379921) vlag(2140867) deadline(722714179921) curr?(0)
schbench-103551 [255] ... : place_entity: Placed on cfs_rq: depth(0) weight(4194304) nr_queued(4) sum_w_vruntime(0) sum_weight(3145728) zero_vruntime(722714445432) sum_shift(0) avg_vruntime(722714056004)
schbench-103551 [255] ... : __enqueue_entity: Enqueue cfs_rq: depth(0) weight(5242880) nr_queued(5) sum_w_vruntime(663820959744) sum_weight(4194304) zero_vruntime(722713520787) sum_shift(0) avg_vruntime(722713520787)
# Couple of reweight while running
schbench-103551 [255] ... : reweight_entity: Reweight before se: weight(3459) vruntime(701806887728588) vlag(0) deadline(701807851411101) curr?(1)
schbench-103551 [255] ... : reweight_entity: Before cfs_rq: depth(-1) weight(3459) nr_queued(1) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701806887728588)
schbench-103551 [255] ... : reweight_entity: Reweight after se: weight(3505) vruntime(701806939248075) vlag(0) deadline(701807839439774) curr?(1)
schbench-103551 [255] ... : reweight_entity: After cfs_rq: depth(-1) weight(3505) nr_queued(1) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701806939248075)
schbench-103551 [255] ... : reweight_entity: Reweight before se: weight(3505) vruntime(701808246440736) vlag(0) deadline(701809202174069) curr?(1)
schbench-103551 [255] ... : reweight_entity: Before cfs_rq: depth(-1) weight(3505) nr_queued(1) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701808246440736)
schbench-103551 [255] ... : reweight_entity: Reweight after se: weight(3513) vruntime(701808246440736) vlag(0) deadline(701809199997619) curr?(1)
schbench-103551 [255] ... : reweight_entity: After cfs_rq: depth(-1) weight(3513) nr_queued(1) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701808246440736)
# put_prev_entity?
schbench-103551 [255] ... : __enqueue_entity: Enqueue cfs_rq: depth(0) weight(5242880) nr_queued(5) sum_w_vruntime(-2130969624576) sum_weight(5242880) zero_vruntime(722714695180) sum_shift(0) avg_vruntime(722714695180)
# set_next_entity?
schbench-103551 [255] ... : __dequeue_entity: Dequeue cfs_rq: depth(0) weight(5242880) nr_queued(5) sum_w_vruntime(0) sum_weight(4194304) zero_vruntime(722715015932) sum_shift(0) avg_vruntime(722715015932)
# More reweight
<...>-102371 [255] ... : reweight_entity: Reweight before se: weight(3513) vruntime(701809611552543) vlag(0) deadline(701810567285876) curr?(1)
<...>-102371 [255] ... : reweight_entity: Before cfs_rq: depth(-1) weight(3513) nr_queued(1) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809611552543)
<...>-102371 [255] ... : reweight_entity: Reweight after se: weight(3508) vruntime(701809611552543) vlag(0) deadline(701810568648095) curr?(1)
<...>-102371 [255] ... : reweight_entity: After cfs_rq: depth(-1) weight(3508) nr_queued(1) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809611552543)
<...>-102371 [255] ... : place_entity: Placed se: weight(90891264) vruntime(701808975077099) vlag(24732) deadline(701808975109401) curr?(0)
<...>-102371 [255] ... : place_entity: Placed on cfs_rq: depth(-1) weight(3508) nr_queued(1) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809615900788)
# Overflow on enqueue
<...>-102371 [255] ... : __enqueue_entity: Overflowed cfs_rq:
<...>-102371 [255] ... : dump_h_overflow_cfs_rq: cfs_rq: depth(0) weight(90894772) nr_queued(2) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809615900788)
<...>-102371 [255] ... : dump_h_overflow_entity: se: weight(3508) vruntime(701809615900788) slice(2800000) deadline(701810568648095) curr?(1) task?(1) <-------- cfs_rq->curr
<...>-102371 [255] ... : __enqueue_entity: Overflowed se:
<...>-102371 [255] ... : dump_h_overflow_entity: se: weight(90891264) vruntime(701808975077099) slice(2800000) deadline(701808975109401) curr?(0) task?(0) <-------- new se
# Botched attempt at dumping the whole hierarchy
<...>-102371 [255] ... : __enqueue_entity: Overflowed hierarchy from root:
<...>-102371 [255] ... : dump_h_overflow_cfs_rq: cfs_rq: depth(0) weight(90894772) nr_queued(2) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809615900788)
<...>-102371 [255] ... : dump_h_overflow_entity: se: weight(3508) vruntime(701809615900788) slice(2800000) deadline(701810568648095) curr?(1) task?(1)
<...>-102371 [255] ... : dump_h_overflow_cfs_rq: cfs_rq: depth(1) weight(5242880) nr_queued(5) sum_w_vruntime(0) sum_weight(4194304) zero_vruntime(722715015932) sum_shift(0) avg_vruntime(722715086591)
<...>-102371 [255] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(722715369227) slice(2800000) deadline(722718169227) curr?(1) task?(0)
<...>-102371 [255] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(722713453675) slice(2800000) deadline(722716247576) curr?(1) task?(0)
<...>-102371 [255] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(722713498238) slice(2800000) deadline(722716290797) curr?(1) task?(0)
<...>-102371 [255] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(722716384383) slice(2800000) deadline(722719172114) curr?(1) task?(0)
<...>-102371 [255] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(722716727432) slice(2800000) deadline(722719517387) curr?(1) task?(0)
Attached is the debug patch. that can be used to interpret this data more.
per-CPU padding is just a variable to add padding for higher depths when
printing the hierarchy.
--
Thanks and Regards,
Prateek
[-- Attachment #2: 0001-sched-fair-Debug-multiplication-overflow.patch --]
[-- Type: text/plain, Size: 7203 bytes --]
From 8fe3036b04a3a529dc500a9c880e23bcfd1daa42 Mon Sep 17 00:00:00 2001
From: "Gautham R. Shenoy" <gautham.shenoy@amd.com>
Date: Wed, 4 Feb 2026 10:08:07 +0000
Subject: [PATCH] sched/fair: Debug multiplication overflow
Read the trace buffer whn dmesg says:
EEVDF: Overflow (mul)!
EEVDF: Overflow CPU/<X>
per_cpu/cpu<X>/trace should have all the information.
Not-signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com>
---
kernel/sched/fair.c | 83 +++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 81 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6f1a86f7969a..15d521f795ff 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -670,6 +670,53 @@ __sum_w_vruntime_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
cfs_rq->sum_weight += weight;
}
+static DEFINE_PER_CPU(char[100], dump_padding);
+u64 avg_vruntime(struct cfs_rq *cfs_rq);
+
+static void dump_h_overflow_entity(struct sched_entity *se, int depth, bool curr)
+{
+ char *padding = *this_cpu_ptr(&dump_padding);
+
+ padding[depth] = '\0';
+ trace_printk("%sse: weight(%lu) vruntime(%llu) slice(%llu) deadline(%llu) curr?(%d) task?(%d)\n",
+ padding, se->load.weight, se->vruntime, se->slice, se->deadline, curr, !entity_is_task(se));
+}
+
+static void dump_h_overflow_cfs_rq(struct cfs_rq *cfs_rq, int depth, bool rec)
+{
+ struct rb_node *left = rb_first_cached(&cfs_rq->tasks_timeline);
+ char *padding = *this_cpu_ptr(&dump_padding);
+
+ padding[depth] = '\0';
+ trace_printk("%scfs_rq: depth(%d) weight(%lu) nr_queued(%u) sum_w_vruntime(%lld) sum_weight(%llu) zero_vruntime(%llu) sum_shift(%u) avg_vruntime(%llu)\n",
+ padding, depth, cfs_rq->load.weight, cfs_rq->nr_queued, cfs_rq->sum_w_vruntime, cfs_rq->sum_weight, cfs_rq->zero_vruntime, cfs_rq->sum_shift, avg_vruntime(cfs_rq));
+
+ if (cfs_rq->curr)
+ dump_h_overflow_entity(cfs_rq->curr, depth, true);
+
+ while (left) {
+ dump_h_overflow_entity(__node_2_se(left), depth, true);
+ left = rb_next(left);
+ }
+
+ if (rec) {
+ padding[depth] = ' ';
+ if (cfs_rq->curr && !entity_is_task(cfs_rq->curr))
+ dump_h_overflow_cfs_rq(group_cfs_rq(cfs_rq->curr), depth + 1, true);
+
+ left = rb_first_cached(&cfs_rq->tasks_timeline);
+ while (left) {
+ struct sched_entity *se = __node_2_se(left);
+
+ if (!entity_is_task(se))
+ dump_h_overflow_cfs_rq(group_cfs_rq(se), depth + 1, true);
+ left = rb_next(left);
+ }
+ }
+
+ padding[depth] = '\0';
+}
+
static void
sum_w_vruntime_add_paranoid(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
@@ -680,17 +727,32 @@ sum_w_vruntime_add_paranoid(struct cfs_rq *cfs_rq, struct sched_entity *se)
weight = avg_vruntime_weight(cfs_rq, se->load.weight);
key = entity_key(cfs_rq, se);
- if (check_mul_overflow(key, weight, &key))
+ if (check_mul_overflow(key, weight, &key)) {
+ pr_warn("EEVDF: Overflow (mul)!\n");
+ pr_warn("EEVDF: Overflow CPU/%d\n", smp_processor_id());
goto overflow;
+ }
- if (check_add_overflow(cfs_rq->sum_w_vruntime, key, &tmp))
+ if (check_add_overflow(cfs_rq->sum_w_vruntime, key, &tmp)) {
+ pr_warn("EEVDF: Overflow (add)!\n");
+ pr_warn("EEVDF: Overflow CPU/%d\n", smp_processor_id());
goto overflow;
+ }
cfs_rq->sum_w_vruntime = tmp;
cfs_rq->sum_weight += weight;
return;
overflow:
+ trace_printk("Overflowed cfs_rq:\n");
+ dump_h_overflow_cfs_rq(cfs_rq, 0, false);
+
+ trace_printk("Overflowed se:\n");
+ dump_h_overflow_entity(se, 0, se == cfs_rq->curr);
+
+ trace_printk("Overflowed hierarchy from root:\n");
+ dump_h_overflow_cfs_rq(&rq_of(cfs_rq)->cfs, 0, true);
+
/*
* There's gotta be a limit -- if we're still failing at this point
* there's really nothing much to be done about things.
@@ -921,6 +983,8 @@ static void __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
se->min_slice = se->slice;
rb_add_augmented_cached(&se->run_node, &cfs_rq->tasks_timeline,
__entity_less, &min_vruntime_cb);
+ trace_printk("Enqueue cfs_rq: depth(%d) weight(%lu) nr_queued(%u) sum_w_vruntime(%lld) sum_weight(%llu) zero_vruntime(%llu) sum_shift(%u) avg_vruntime(%llu)\n",
+ se->depth - 1, cfs_rq->load.weight, cfs_rq->nr_queued, cfs_rq->sum_w_vruntime, cfs_rq->sum_weight, cfs_rq->zero_vruntime, cfs_rq->sum_shift, avg_vruntime(cfs_rq));
}
static void __dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
@@ -929,6 +993,8 @@ static void __dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
&min_vruntime_cb);
sum_w_vruntime_sub(cfs_rq, se);
update_zero_vruntime(cfs_rq);
+ trace_printk("Dequeue cfs_rq: depth(%d) weight(%lu) nr_queued(%u) sum_w_vruntime(%lld) sum_weight(%llu) zero_vruntime(%llu) sum_shift(%u) avg_vruntime(%llu)\n",
+ se->depth - 1, cfs_rq->load.weight, cfs_rq->nr_queued, cfs_rq->sum_w_vruntime, cfs_rq->sum_weight, cfs_rq->zero_vruntime, cfs_rq->sum_shift, avg_vruntime(cfs_rq));
}
struct sched_entity *__pick_root_entity(struct cfs_rq *cfs_rq)
@@ -3963,6 +4029,10 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
bool rel_vprot = false;
u64 avruntime = 0;
+ trace_printk("Reweight before se: weight(%lu) vruntime(%llu) vlag(%lld) deadline(%llu) curr?(%d)\n",
+ se->load.weight, se->vruntime, se->vlag, se->deadline, se == cfs_rq->curr);
+ trace_printk("Before cfs_rq: depth(%d) weight(%lu) nr_queued(%u) sum_w_vruntime(%lld) sum_weight(%llu) zero_vruntime(%llu) sum_shift(%u) avg_vruntime(%llu)\n",
+ se->depth - 1, cfs_rq->load.weight, cfs_rq->nr_queued, cfs_rq->sum_w_vruntime, cfs_rq->sum_weight, cfs_rq->zero_vruntime, cfs_rq->sum_shift, avg_vruntime(cfs_rq));
if (se->on_rq) {
/* commit outstanding execution time */
update_curr(cfs_rq);
@@ -3998,6 +4068,10 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
__enqueue_entity(cfs_rq, se);
cfs_rq->nr_queued++;
}
+ trace_printk("Reweight after se: weight(%lu) vruntime(%llu) vlag(%lld) deadline(%llu) curr?(%d)\n",
+ se->load.weight, se->vruntime, se->vlag, se->deadline, se == cfs_rq->curr);
+ trace_printk("After cfs_rq: depth(%d) weight(%lu) nr_queued(%u) sum_w_vruntime(%lld) sum_weight(%llu) zero_vruntime(%llu) sum_shift(%u) avg_vruntime(%llu)\n",
+ se->depth - 1, cfs_rq->load.weight, cfs_rq->nr_queued, cfs_rq->sum_w_vruntime, cfs_rq->sum_weight, cfs_rq->zero_vruntime, cfs_rq->sum_shift, avg_vruntime(cfs_rq));
}
static void reweight_task_fair(struct rq *rq, struct task_struct *p,
@@ -5367,6 +5441,11 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
* EEVDF: vd_i = ve_i + r_i/w_i
*/
se->deadline = se->vruntime + vslice;
+
+ trace_printk("Placed se: weight(%lu) vruntime(%llu) vlag(%lld) deadline(%llu) curr?(%d)\n",
+ se->load.weight, se->vruntime, se->vlag, se->deadline, se == cfs_rq->curr);
+ trace_printk("Placed on cfs_rq: depth(%d) weight(%lu) nr_queued(%u) sum_w_vruntime(%lld) sum_weight(%llu) zero_vruntime(%llu) sum_shift(%u) avg_vruntime(%llu)\n",
+ se->depth - 1, cfs_rq->load.weight, cfs_rq->nr_queued, cfs_rq->sum_w_vruntime, cfs_rq->sum_weight, cfs_rq->zero_vruntime, cfs_rq->sum_shift, avg_vruntime(cfs_rq));
}
static void check_enqueue_throttle(struct cfs_rq *cfs_rq);
--
2.34.1
^ permalink raw reply related [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-04 10:15 ` K Prateek Nayak
@ 2026-02-09 15:47 ` Peter Zijlstra
2026-02-09 16:52 ` K Prateek Nayak
` (3 more replies)
0 siblings, 4 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-09 15:47 UTC (permalink / raw)
To: K Prateek Nayak
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
On Wed, Feb 04, 2026 at 03:45:58PM +0530, K Prateek Nayak wrote:
> # Overflow on enqueue
>
> <...>-102371 [255] ... : __enqueue_entity: Overflowed cfs_rq:
> <...>-102371 [255] ... : dump_h_overflow_cfs_rq: cfs_rq: depth(0) weight(90894772) nr_queued(2) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809615900788)
> <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(3508) vruntime(701809615900788) slice(2800000) deadline(701810568648095) curr?(1) task?(1) <-------- cfs_rq->curr
> <...>-102371 [255] ... : __enqueue_entity: Overflowed se:
> <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(90891264) vruntime(701808975077099) slice(2800000) deadline(701808975109401) curr?(0) task?(0) <-------- new se
So I spend a whole time trying to reproduce the splat, but alas.
That said, I did spot something 'funny' in the above, note that
zero_vruntime and avg_vruntime/curr->vruntime are significantly apart.
That is not something that should happen. zero_vruntime is supposed to
closely track avg_vruntime.
That lead me to hypothesise that there is a problem tracking
zero_vruntime when there is but a single runnable task, and sure
enough, I could reproduce that, albeit not at such a scale as to lead to
such problems (probably too much noise on my machine).
I ended up with the below; and I've already pushed out a fresh
queue/sched/core. Could you please test again?
---
Subject: sched/fair: Fix zero_vruntime tracking
From: Peter Zijlstra <peterz@infradead.org>
Date: Mon Feb 9 15:28:16 CET 2026
It turns out that zero_vruntime tracking is broken when there is but a single
task running. Current update paths are through __{en,de}queue_entity(), and
when there is but a single task, pick_next_task() will always return that one
task, and put_prev_set_next_task() will end up in neither function.
This can cause entity_key() to grow indefinitely large and cause overflows,
leading to much pain and suffering.
Furtermore, doing update_zero_vruntime() from __{de,en}queue_entity(), which
are called from {set_next,put_prev}_entity() has problems because:
- set_next_entity() calls __dequeue_entity() before it does cfs_rq->curr = se.
This means the avg_vruntime() will see the removal but not current, missing
the entity for accounting.
- put_prev_entity() calls __enqueue_entity() before it does cfs_rq->curr =
NULL. This means the avg_vruntime() will see the addition *and* current,
leading to double accounting.
Both cases are incorrect.
Noting that avg_vruntime is already called on each {en,de}queue, remove the
explicit avg_vruntime() calls (which removes an extra 64bit division for each
{en,de}queue) and have avg_vruntime() update zero_vruntime itself.
Additionally, have the tick call avg_vruntime() -- discarding the result, but
for the side-effect of updating zero_vruntime.
While there, optimize avg_vruntime() by noting that the average of one value is
rather trivial to compute.
Test case:
# taskset -c -p 1 $$
# taskset -c 2 bash -c 'while :; do :; done&'
# cat /sys/kernel/debug/sched/debug | awk '/^cpu#/ {P=0} /^cpu#2,/ {P=1} {if (P) print $0}' | grep -e zero_vruntime -e "^>"
PRE:
.zero_vruntime : 31316.407903
>R bash 487 50787.345112 E 50789.145972 2.800000 50780.298364 16 120 0.000000 0.000000 0.000000 /
.zero_vruntime : 382548.253179
>R bash 487 427275.204288 E 427276.003584 2.800000 427268.157540 23 120 0.000000 0.000000 0.000000 /
POST:
.zero_vruntime : 17259.709467
>R bash 526 17259.709467 E 17262.509467 2.800000 16915.031624 9 120 0.000000 0.000000 0.000000 /
.zero_vruntime : 18702.723356
>R bash 526 18702.723356 E 18705.523356 2.800000 18358.045513 9 120 0.000000 0.000000 0.000000 /
Fixes: 79f3f9bedd14 ("sched/eevdf: Fix min_vruntime vs avg_vruntime")
Reported-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/fair.c | 81 +++++++++++++++++++++++++++++++++++-----------------
1 file changed, 55 insertions(+), 26 deletions(-)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -589,6 +589,21 @@ static inline bool entity_before(const s
return vruntime_cmp(a->deadline, "<", b->deadline);
}
+/*
+ * Per avg_vruntime() below, cfs_rq::zero_vruntime is only slightly stale
+ * and this value should be no more than two lag bounds. Which puts it in the
+ * general order of:
+ *
+ * (slice + TICK_NSEC) << NICE_0_LOAD_SHIFT
+ *
+ * which is around 44 bits in size (on 64bit); that is 20 for
+ * NICE_0_LOAD_SHIFT, another 20 for NSEC_PER_MSEC and then a handful for
+ * however many msec the actual slice+tick ends up begin.
+ *
+ * (disregarding the actual divide-by-weight part makes for the worst case
+ * weight of 2, which nicely cancels vs the fuzz in zero_vruntime not actually
+ * being the zero-lag point).
+ */
static inline s64 entity_key(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
return vruntime_op(se->vruntime, "-", cfs_rq->zero_vruntime);
@@ -676,39 +691,60 @@ sum_w_vruntime_sub(struct cfs_rq *cfs_rq
}
static inline
-void sum_w_vruntime_update(struct cfs_rq *cfs_rq, s64 delta)
+void update_zero_vruntime(struct cfs_rq *cfs_rq, s64 delta)
{
/*
* v' = v + d ==> sum_w_vruntime' = sum_runtime - d*sum_weight
*/
cfs_rq->sum_w_vruntime -= cfs_rq->sum_weight * delta;
+ cfs_rq->zero_vruntime += delta;
}
/*
- * Specifically: avg_runtime() + 0 must result in entity_eligible() := true
+ * Specifically: avg_vruntime() + 0 must result in entity_eligible() := true
* For this to be so, the result of this function must have a left bias.
+ *
+ * Called in:
+ * - place_entity() -- before enqueue
+ * - update_entity_lag() -- before dequeue
+ * - entity_tick()
+ *
+ * This means it is one entry 'behind' but that puts it close enough to where
+ * the bound on entity_key() is at most two lag bounds.
*/
u64 avg_vruntime(struct cfs_rq *cfs_rq)
{
struct sched_entity *curr = cfs_rq->curr;
- s64 avg = cfs_rq->sum_w_vruntime;
- long load = cfs_rq->sum_weight;
+ s64 delta = 0, runtime = cfs_rq->sum_w_vruntime;
+ long weight = cfs_rq->sum_weight;
- if (curr && curr->on_rq) {
- unsigned long weight = scale_load_down(curr->load.weight);
+ if (curr && !curr->on_rq)
+ curr = NULL;
- avg += entity_key(cfs_rq, curr) * weight;
- load += weight;
- }
+ if (weight) {
+ if (curr) {
+ unsigned long w = scale_load_down(curr->load.weight);
+
+ runtime += entity_key(cfs_rq, curr) * w;
+ weight += w;
+ }
- if (load) {
/* sign flips effective floor / ceiling */
- if (avg < 0)
- avg -= (load - 1);
- avg = div_s64(avg, load);
+ if (runtime < 0)
+ runtime -= (weight - 1);
+
+ delta = div_s64(runtime, weight);
+
+ } else if (curr) {
+ /*
+ * When there is but one element, it is the average.
+ */
+ delta = curr->vruntime - cfs_rq->zero_vruntime;
}
- return cfs_rq->zero_vruntime + avg;
+ update_zero_vruntime(cfs_rq, delta);
+
+ return cfs_rq->zero_vruntime;
}
/*
@@ -777,16 +813,6 @@ int entity_eligible(struct cfs_rq *cfs_r
return vruntime_eligible(cfs_rq, se->vruntime);
}
-static void update_zero_vruntime(struct cfs_rq *cfs_rq)
-{
- u64 vruntime = avg_vruntime(cfs_rq);
- s64 delta = vruntime_op(vruntime, "-", cfs_rq->zero_vruntime);
-
- sum_w_vruntime_update(cfs_rq, delta);
-
- cfs_rq->zero_vruntime = vruntime;
-}
-
static inline u64 cfs_rq_min_slice(struct cfs_rq *cfs_rq)
{
struct sched_entity *root = __pick_root_entity(cfs_rq);
@@ -856,7 +882,6 @@ RB_DECLARE_CALLBACKS(static, min_vruntim
static void __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
{
sum_w_vruntime_add(cfs_rq, se);
- update_zero_vruntime(cfs_rq);
se->min_vruntime = se->vruntime;
se->min_slice = se->slice;
rb_add_augmented_cached(&se->run_node, &cfs_rq->tasks_timeline,
@@ -868,7 +893,6 @@ static void __dequeue_entity(struct cfs_
rb_erase_augmented_cached(&se->run_node, &cfs_rq->tasks_timeline,
&min_vruntime_cb);
sum_w_vruntime_sub(cfs_rq, se);
- update_zero_vruntime(cfs_rq);
}
struct sched_entity *__pick_root_entity(struct cfs_rq *cfs_rq)
@@ -5524,6 +5548,11 @@ entity_tick(struct cfs_rq *cfs_rq, struc
update_load_avg(cfs_rq, curr, UPDATE_TG);
update_cfs_group(curr);
+ /*
+ * Pulls along cfs_rq::zero_vruntime.
+ */
+ avg_vruntime(cfs_rq);
+
#ifdef CONFIG_SCHED_HRTICK
/*
* queued ticks are scheduled to match the slice, so don't bother
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-09 15:47 ` Peter Zijlstra
@ 2026-02-09 16:52 ` K Prateek Nayak
2026-02-10 5:16 ` K Prateek Nayak
` (2 subsequent siblings)
3 siblings, 0 replies; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-09 16:52 UTC (permalink / raw)
To: Peter Zijlstra
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
Hello Peter,
On 2/9/2026 9:17 PM, Peter Zijlstra wrote:
> On Wed, Feb 04, 2026 at 03:45:58PM +0530, K Prateek Nayak wrote:
>
>> # Overflow on enqueue
>>
>> <...>-102371 [255] ... : __enqueue_entity: Overflowed cfs_rq:
>> <...>-102371 [255] ... : dump_h_overflow_cfs_rq: cfs_rq: depth(0) weight(90894772) nr_queued(2) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809615900788)
>> <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(3508) vruntime(701809615900788) slice(2800000) deadline(701810568648095) curr?(1) task?(1) <-------- cfs_rq->curr
>> <...>-102371 [255] ... : __enqueue_entity: Overflowed se:
>> <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(90891264) vruntime(701808975077099) slice(2800000) deadline(701808975109401) curr?(0) task?(0) <-------- new se
>
> So I spend a whole time trying to reproduce the splat, but alas.
>
> That said, I did spot something 'funny' in the above, note that
> zero_vruntime and avg_vruntime/curr->vruntime are significantly apart.
> That is not something that should happen. zero_vruntime is supposed to
> closely track avg_vruntime.
>
> That lead me to hypothesise that there is a problem tracking
> zero_vruntime when there is but a single runnable task, and sure
> enough, I could reproduce that, albeit not at such a scale as to lead to
> such problems (probably too much noise on my machine).
>
> I ended up with the below; and I've already pushed out a fresh
> queue/sched/core. Could you please test again?
Thank you for looking into this. I'll merge this onto tip:sched/urgent
and take it for a spin overnight like last time with PARANOID_AVG and
see if the sum_shifts increment this time around.
Will report back tomorrow on the status.
As for the patch itself, I'll take a look at it tomorrow - limited by my
drowsiness at the moment :-)
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-09 15:47 ` Peter Zijlstra
2026-02-09 16:52 ` K Prateek Nayak
@ 2026-02-10 5:16 ` K Prateek Nayak
2026-02-10 10:29 ` Peter Zijlstra
2026-02-10 15:41 ` Doug Smythies
2026-02-10 20:52 ` Vincent Guittot
3 siblings, 1 reply; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-10 5:16 UTC (permalink / raw)
To: Peter Zijlstra
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
Hello Peter,
On 2/9/2026 9:17 PM, Peter Zijlstra wrote:
> I ended up with the below; and I've already pushed out a fresh
> queue/sched/core. Could you please test again?
I haven't seen any "sum_shifts" turning non-zero on the overnight runs,
even with the larger workloads, so feel free to include:
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
The overall patch looks good. I only have couple of cosmetic nits
inlined below:
[..snip..]
> u64 avg_vruntime(struct cfs_rq *cfs_rq)
> {
> struct sched_entity *curr = cfs_rq->curr;
> - s64 avg = cfs_rq->sum_w_vruntime;
> - long load = cfs_rq->sum_weight;
> + s64 delta = 0, runtime = cfs_rq->sum_w_vruntime;
nit.
"runtime" is only ever used in "weight" != 0 case so perhaps it can be
moved there to preserve the reverse x-mas (or this whole line can be
moved up top).
> + long weight = cfs_rq->sum_weight;
>
> - if (curr && curr->on_rq) {
> - unsigned long weight = scale_load_down(curr->load.weight);
> + if (curr && !curr->on_rq)
> + curr = NULL;
>
> - avg += entity_key(cfs_rq, curr) * weight;
> - load += weight;
> - }
> + if (weight) {
> + if (curr) {
> + unsigned long w = scale_load_down(curr->load.weight);
> +
> + runtime += entity_key(cfs_rq, curr) * w;
> + weight += w;
> + }
>
> - if (load) {
> /* sign flips effective floor / ceiling */
> - if (avg < 0)
> - avg -= (load - 1);
> - avg = div_s64(avg, load);
> + if (runtime < 0)
> + runtime -= (weight - 1);
> +
> + delta = div_s64(runtime, weight);
> +
nit. Is this empty line necessary?
> + } else if (curr) {
> + /*
> + * When there is but one element, it is the average.
> + */
> + delta = curr->vruntime - cfs_rq->zero_vruntime;
> }
>
> - return cfs_rq->zero_vruntime + avg;
> + update_zero_vruntime(cfs_rq, delta);
> +
> + return cfs_rq->zero_vruntime;
> }
>
> /*
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 5:16 ` K Prateek Nayak
@ 2026-02-10 10:29 ` Peter Zijlstra
0 siblings, 0 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-10 10:29 UTC (permalink / raw)
To: K Prateek Nayak
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
On Tue, Feb 10, 2026 at 10:46:28AM +0530, K Prateek Nayak wrote:
> Hello Peter,
>
> On 2/9/2026 9:17 PM, Peter Zijlstra wrote:
> > I ended up with the below; and I've already pushed out a fresh
> > queue/sched/core. Could you please test again?
>
> I haven't seen any "sum_shifts" turning non-zero on the overnight runs,
> even with the larger workloads, so feel free to include:
>
> Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Awesome, thanks!
>
> The overall patch looks good. I only have couple of cosmetic nits
> inlined below:
>
> [..snip..]
>
> > u64 avg_vruntime(struct cfs_rq *cfs_rq)
> > {
> > struct sched_entity *curr = cfs_rq->curr;
> > - s64 avg = cfs_rq->sum_w_vruntime;
> > - long load = cfs_rq->sum_weight;
> > + s64 delta = 0, runtime = cfs_rq->sum_w_vruntime;
>
> nit.
>
> "runtime" is only ever used in "weight" != 0 case so perhaps it can be
> moved there to preserve the reverse x-mas (or this whole line can be
> moved up top).
Indeed!
> > + long weight = cfs_rq->sum_weight;
> >
> > - if (curr && curr->on_rq) {
> > - unsigned long weight = scale_load_down(curr->load.weight);
> > + if (curr && !curr->on_rq)
> > + curr = NULL;
> >
> > - avg += entity_key(cfs_rq, curr) * weight;
> > - load += weight;
> > - }
> > + if (weight) {
> > + if (curr) {
> > + unsigned long w = scale_load_down(curr->load.weight);
> > +
> > + runtime += entity_key(cfs_rq, curr) * w;
> > + weight += w;
> > + }
> >
> > - if (load) {
> > /* sign flips effective floor / ceiling */
> > - if (avg < 0)
> > - avg -= (load - 1);
> > - avg = div_s64(avg, load);
> > + if (runtime < 0)
> > + runtime -= (weight - 1);
> > +
> > + delta = div_s64(runtime, weight);
> > +
>
> nit. Is this empty line necessary?
Not really, but somehow I always find myself ending a block with an
empty line when there's an else statement following.
I'll get rid of it :-)
^ permalink raw reply [flat|nested] 70+ messages in thread
* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-09 15:47 ` Peter Zijlstra
2026-02-09 16:52 ` K Prateek Nayak
2026-02-10 5:16 ` K Prateek Nayak
@ 2026-02-10 15:41 ` Doug Smythies
2026-02-10 18:09 ` K Prateek Nayak
2026-02-10 18:52 ` Peter Zijlstra
2026-02-10 20:52 ` Vincent Guittot
3 siblings, 2 replies; 70+ messages in thread
From: Doug Smythies @ 2026-02-10 15:41 UTC (permalink / raw)
To: 'Peter Zijlstra', 'K Prateek Nayak'
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, Doug Smythies
On 2026.02.09.07:47 Peter Zijlstra wrote:
> On Wed, Feb 04, 2026 at 03:45:58PM +0530, K Prateek Nayak wrote:
>
>> # Overflow on enqueue
>>
>> <...>-102371 [255] ... : __enqueue_entity: Overflowed cfs_rq:
>> <...>-102371 [255] ... : dump_h_overflow_cfs_rq: cfs_rq: depth(0) weight(90894772) nr_queued(2) sum_w_vruntime(0)
sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809615900788)
>> <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(3508) vruntime(701809615900788) slice(2800000)
deadline(701810568648095) curr?(1) task?(1) <-------- cfs_rq->curr
>> <...>-102371 [255] ... : __enqueue_entity: Overflowed se:
>> <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(90891264) vruntime(701808975077099) slice(2800000)
deadline(701808975109401) curr?(0) task?(0) <-------- new se
>
> So I spend a whole time trying to reproduce the splat, but alas.
>
> That said, I did spot something 'funny' in the above, note that
> zero_vruntime and avg_vruntime/curr->vruntime are significantly apart.
> That is not something that should happen. zero_vruntime is supposed to
> closely track avg_vruntime.
>
> That lead me to hypothesise that there is a problem tracking
> zero_vruntime when there is but a single runnable task, and sure
> enough, I could reproduce that, albeit not at such a scale as to lead to
> such problems (probably too much noise on my machine).
>
> I ended up with the below; and I've already pushed out a fresh
> queue/sched/core. Could you please test again?
I tested this "V2". The CPU migration times test results are not good.
We expect the sample time to not deviate from the nominal 1 second
by more than 10 milliseconds for this test. The test ran for about
13 hours and 41 minutes (49,243 samples). Histogram of times:
kernel: 6.19.0-rc8-pz-v2
gov: powersave
HWP: enabled
1.000, 29206
1.001, 19598
1.002, 19
1.003, 15
1.004, 32
1.005, 25
1.006, 3
1.007, 3
1.008, 5
1.009, 5
1.010, 13
1.011, 14
1.012, 13
1.013, 6
1.014, 10
1.015, 16
1.016, 54
1.017, 116
1.018, 57
1.019, 7
1.020, 2
1.021, 1
1.023, 2
1.024, 4
1.025, 7
1.026, 1
1.027, 1
1.028, 1
1.029, 1
1.030, 2
1.037, 1
Total: 49240 : Total >= 10 mSec: 329 ( 0.67 percent)
For reference previous test results are copied and pasted below.
Step 1: Confirm where we left off a year ago:
The exact same kernel from a year ago, that we ended up happy with, was used.
doug@s19:~/tmp/peterz/6.19/turbo$ cat 613.his
Kernel: 6.13.0-stock
gov: powersave
HWP: enabled
1.000000, 23195
1.001000, 10897
1.002000, 49
1.003000, 23
1.004000, 21
1.005000, 9
Total: 34194 : Total >= 10 mSec: 0 ( 0.00 percent)
So, over 9 hours and never a nominal sample time exceeded by over 5 milliseconds.
Very good.
Step 2: Take a baseline sample before this patch set:
Mainline kernel 6.19-rc1 was used:
doug@s19:~/tmp/peterz/6.19/turbo$ cat rc1.his
Kernel: 6.19.0-rc1-stock
gov: powersave
HWP: enabled
1.000000, 19509
1.001000, 10430
1.002000, 32
1.003000, 19
1.004000, 24
1.005000, 13
1.006000, 9
1.007000, 4
1.008000, 3
1.009000, 4
1.010000, 6
1.011000, 2
1.012000, 1
1.013000, 4
1.014000, 10
1.015000, 10
1.016000, 7
1.017000, 10
1.018000, 20
1.019000, 12
1.020000, 5
1.021000, 3
1.022000, 1
1.023000, 2
1.024000, 2 <<< Clamped. Actually 26 and 25 milliseconds
Total: 30142 : Total >= 10 mSec: 95 ( 0.32 percent)
What!!!
Over 8 hours.
It seems something has regressed over the last year.
Our threshold of 10 milliseconds was rather arbitrary.
Step 3: This patch set [V1] and from Peter's git tree:
doug@s19:~/tmp/peterz/6.19/turbo$ cat 02.his
kernel: 6.19.0-rc1-pz
gov: powersave
HWP: enabled
1.000000, 19139
1.001000, 9532
1.002000, 19
1.003000, 17
1.004000, 8
1.005000, 3
1.006000, 2
1.009000, 1
Total: 28721 : Total >= 10 mSec: 0 ( 0.00 percent)
Just about 8 hours.
Never a time >= our arbitrary threshold of 10 milliseconds.
So, good.
My test computer also hung under the heavy heavy load test,
albeit at a higher load than before.
There was no log information that I could find after the re-boot.
References:
https://lore.kernel.org/lkml/000d01dc939e$0fc99fe0$2f5cdfa0$@telus.net/
https://lore.kernel.org/lkml/005f01db5a44$3bb698e0$b323caa0$@telus.net/
https://lore.kernel.org/lkml/004a01dc952b$471c94a0$d555bde0$@telus.net/
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 15:41 ` Doug Smythies
@ 2026-02-10 18:09 ` K Prateek Nayak
2026-02-10 18:35 ` Peter Zijlstra
2026-02-11 23:09 ` Doug Smythies
2026-02-10 18:52 ` Peter Zijlstra
1 sibling, 2 replies; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-10 18:09 UTC (permalink / raw)
To: Doug Smythies, 'Peter Zijlstra'
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel
Hello Doug,
On 2/10/2026 9:11 PM, Doug Smythies wrote:
> My test computer also hung under the heavy heavy load test,
> albeit at a higher load than before.
> There was no log information that I could find after the re-boot.
Could you run the same scenario with PARANOID_AVG:
echo PARANOID_AVG > /sys/kernel/debug/sched/features
and once you are past the point when the system would have usually
hung, can check if the "sum_shifts" reported for cfs_rq in the
debugfs have changed to some non-zero value:
grep "shift.*: [^0]$" /sys/kernel/debug/sched/debug
I'm assuming this is the same "yes" x 12500 copies bomb that failed.
Let me see if I can reproduce this on my setup by leaving it going
overnight on a limited cpuset.
Since you mentioned there is some bound to the number of copies when
the hang is observed, can you please share your system details and
the number of CPUs it has?
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 18:09 ` K Prateek Nayak
@ 2026-02-10 18:35 ` Peter Zijlstra
2026-02-10 20:04 ` K Prateek Nayak
2026-02-11 23:09 ` Doug Smythies
1 sibling, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-10 18:35 UTC (permalink / raw)
To: K Prateek Nayak
Cc: Doug Smythies, mingo, juri.lelli, vincent.guittot,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Tue, Feb 10, 2026 at 11:39:14PM +0530, K Prateek Nayak wrote:
> Since you mentioned there is some bound to the number of copies when
> the hang is observed, can you please share your system details and
> the number of CPUs it has?
He had that information in another email, 6 cores/12 threads.
For me, I got to 21160 spread over 12 threads when it went boom. That
translates to aroun 1763 per CPU. Which is a fairly silly number of
active tasks, but it *should* work.
It's a bit tedious to reproduce, but I'll prod at it some too.
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 18:35 ` Peter Zijlstra
@ 2026-02-10 20:04 ` K Prateek Nayak
2026-02-11 6:28 ` K Prateek Nayak
0 siblings, 1 reply; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-10 20:04 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Doug Smythies, mingo, juri.lelli, vincent.guittot,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On 2/11/2026 12:05 AM, Peter Zijlstra wrote:
> On Tue, Feb 10, 2026 at 11:39:14PM +0530, K Prateek Nayak wrote:
>
>
>> Since you mentioned there is some bound to the number of copies when
>> the hang is observed, can you please share your system details and
>> the number of CPUs it has?
>
> He had that information in another email, 6 cores/12 threads.
Ah! My bad. should have dug deeper.
>
> For me, I got to 21160 spread over 12 threads when it went boom. That
> translates to aroun 1763 per CPU. Which is a fairly silly number of
> active tasks, but it *should* work.
>
> It's a bit tedious to reproduce, but I'll prod at it some too.
My machine hasn't cracked yet with 30k instances. I'll too will prod
more tomorrow.
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 20:04 ` K Prateek Nayak
@ 2026-02-11 6:28 ` K Prateek Nayak
2026-02-11 8:50 ` K Prateek Nayak
0 siblings, 1 reply; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-11 6:28 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Doug Smythies, mingo, juri.lelli, vincent.guittot,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
[-- Attachment #1: Type: text/plain, Size: 1603 bytes --]
On 2/11/2026 1:34 AM, K Prateek Nayak wrote:
> My machine hasn't cracked yet with 30k instances. I'll too will prod
> more tomorrow.
So it did crack after a while and turns out it is not a result of
overflow but some other weirdness. I'll leave the full log below but
when I see pick returning NULL, the cfs_rq looks like:
(Note: All logs have curr?(1) which is incorrect. The first "se"
after the "cfs_rq" log is likely the actual "cfs_rq->curr".)
cfs_rq of overflow:
cfs_rq: depth(0) weight(2150629376) nr_queued(2051) sum_w_vruntime(5064132716358795264) sum_weight(2149580800) zero_vruntime(18446744071726874277) sum_shift(0) avg_vruntime(18446744071726874277)
se: weight(1048576) vruntime(18446744069623207599) slice(2800000) deadline(18446744069626004775) curr?(1) task?(0)
^^^
This is likely the curr since I print it first and it has a very
different vruntime compared to others.
se: weight(1048576) vruntime(373218199) slice(2800000) deadline(373446702) curr?(1) task?(0)
se: weight(1048576) vruntime(371876685) slice(2800000) deadline(373815965) curr?(1) task?(0)
se: weight(1048576) vruntime(372314317) slice(2800000) deadline(373817932) curr?(1) task?(0)
se: weight(1048576) vruntime(371022075) slice(2800000) deadline(373819151) curr?(1) task?(0)
... few thousand more se but they have similar vruntime, slice, deadline
I'll go back and fix my debug patch to give a full view of series of
events that leads to this but in the meantime I've added the full log
below if someone wants to take a look.
--
Thanks and Regards,
Prateek
[-- Attachment #2: crash.log --]
[-- Type: text/plain, Size: 478751 bytes --]
[ 3597.125611][T52604] cfs_rq of overflow:
[ 3597.129895][T52604] cfs_rq: depth(0) weight(2150629376) nr_queued(2051) sum_w_vruntime(5064132716358795264) sum_weight(2149580800) zero_vruntime(18446744071726874277) sum_shift(0) avg_vruntime(18446744071726874277)
[ 3597.151144][T52604] se: weight(1048576) vruntime(18446744069623207599) slice(2800000) deadline(18446744069626004775) curr?(1) task?(0)
[ 3597.164633][T52604] se: weight(1048576) vruntime(373218199) slice(2800000) deadline(373446702) curr?(1) task?(0)
[ 3597.175988][T52604] se: weight(1048576) vruntime(371876685) slice(2800000) deadline(373815965) curr?(1) task?(0)
[ 3597.187344][T52604] se: weight(1048576) vruntime(372314317) slice(2800000) deadline(373817932) curr?(1) task?(0)
[ 3597.198702][T52604] se: weight(1048576) vruntime(371022075) slice(2800000) deadline(373819151) curr?(1) task?(0)
[ 3597.210058][T52604] se: weight(1048576) vruntime(371021926) slice(2800000) deadline(373819933) curr?(1) task?(0)
[ 3597.221415][T52604] se: weight(1048576) vruntime(371024680) slice(2800000) deadline(373820994) curr?(1) task?(0)
[ 3597.232772][T52604] se: weight(1048576) vruntime(371025329) slice(2800000) deadline(373822054) curr?(1) task?(0)
[ 3597.244129][T52604] se: weight(1048576) vruntime(371025579) slice(2800000) deadline(373823416) curr?(1) task?(0)
[ 3597.255484][T52604] se: weight(1048576) vruntime(371029988) slice(2800000) deadline(373824850) curr?(1) task?(0)
[ 3597.266840][T52604] se: weight(1048576) vruntime(371026685) slice(2800000) deadline(373824923) curr?(1) task?(0)
[ 3597.278195][T52604] se: weight(1048576) vruntime(371028210) slice(2800000) deadline(373825326) curr?(1) task?(0)
[ 3597.289554][T52604] se: weight(1048576) vruntime(371027706) slice(2800000) deadline(373825413) curr?(1) task?(0)
[ 3597.300914][T52604] se: weight(1048576) vruntime(372171878) slice(2800000) deadline(373826550) curr?(1) task?(0)
[ 3597.312264][T52604] se: weight(1048576) vruntime(371030162) slice(2800000) deadline(373826987) curr?(1) task?(0)
[ 3597.323620][T52604] se: weight(1048576) vruntime(371031553) slice(2800000) deadline(373827607) curr?(1) task?(0)
[ 3597.334968][T52604] se: weight(1048576) vruntime(371046374) slice(2800000) deadline(373829839) curr?(1) task?(0)
[ 3597.346320][T52604] se: weight(1048576) vruntime(372141770) slice(2800000) deadline(373830273) curr?(1) task?(0)
[ 3597.357676][T52604] se: weight(1048576) vruntime(371034528) slice(2800000) deadline(373832655) curr?(1) task?(0)
[ 3597.369035][T52604] se: weight(1048576) vruntime(371035278) slice(2800000) deadline(373833104) curr?(1) task?(0)
[ 3597.380394][T52604] se: weight(1048576) vruntime(371035992) slice(2800000) deadline(373833889) curr?(1) task?(0)
[ 3597.391752][T52604] se: weight(1048576) vruntime(371037150) slice(2800000) deadline(373833925) curr?(1) task?(0)
[ 3597.403111][T52604] se: weight(1048576) vruntime(371039526) slice(2800000) deadline(373834158) curr?(1) task?(0)
[ 3597.414468][T52604] se: weight(1048576) vruntime(371039175) slice(2800000) deadline(373836601) curr?(1) task?(0)
[ 3597.425823][T52604] se: weight(1048576) vruntime(371041584) slice(2800000) deadline(373839471) curr?(1) task?(0)
[ 3597.437180][T52604] se: weight(1048576) vruntime(371042368) slice(2800000) deadline(373839774) curr?(1) task?(0)
[ 3597.448539][T52604] se: weight(1048576) vruntime(372223233) slice(2800000) deadline(373839798) curr?(1) task?(0)
[ 3597.459896][T52604] se: weight(1048576) vruntime(372179775) slice(2800000) deadline(373841918) curr?(1) task?(0)
[ 3597.471256][T52604] se: weight(1048576) vruntime(371044163) slice(2800000) deadline(373842191) curr?(1) task?(0)
[ 3597.482614][T52604] se: weight(1048576) vruntime(371044711) slice(2800000) deadline(373842878) curr?(1) task?(0)
[ 3597.493970][T52604] se: weight(1048576) vruntime(371045850) slice(2800000) deadline(373843486) curr?(1) task?(0)
[ 3597.505327][T52604] se: weight(1048576) vruntime(371049649) slice(2800000) deadline(373845513) curr?(1) task?(0)
[ 3597.516684][T52604] se: weight(1048576) vruntime(372282218) slice(2800000) deadline(373846896) curr?(1) task?(0)
[ 3597.528039][T52604] se: weight(1048576) vruntime(371054889) slice(2800000) deadline(373851814) curr?(1) task?(0)
[ 3597.539398][T52604] se: weight(1048576) vruntime(371055983) slice(2800000) deadline(373852628) curr?(1) task?(0)
[ 3597.550749][T52604] se: weight(1048576) vruntime(371055796) slice(2800000) deadline(373853522) curr?(1) task?(0)
[ 3597.562106][T52604] se: weight(1048576) vruntime(371059157) slice(2800000) deadline(373856944) curr?(1) task?(0)
[ 3597.573462][T52604] se: weight(1048576) vruntime(371062493) slice(2800000) deadline(373858307) curr?(1) task?(0)
[ 3597.584811][T52604] se: weight(1048576) vruntime(371061297) slice(2800000) deadline(373858593) curr?(1) task?(0)
[ 3597.596165][T52604] se: weight(1048576) vruntime(372227534) slice(2800000) deadline(373860944) curr?(1) task?(0)
[ 3597.607521][T52604] se: weight(1048576) vruntime(371064327) slice(2800000) deadline(373861553) curr?(1) task?(0)
[ 3597.618881][T52604] se: weight(1048576) vruntime(371068680) slice(2800000) deadline(373862561) curr?(1) task?(0)
[ 3597.630239][T52604] se: weight(1048576) vruntime(372350717) slice(2800000) deadline(373862975) curr?(1) task?(0)
[ 3597.641600][T52604] se: weight(1048576) vruntime(372210581) slice(2800000) deadline(373864201) curr?(1) task?(0)
[ 3597.652957][T52604] se: weight(1048576) vruntime(371069448) slice(2800000) deadline(373867135) curr?(1) task?(0)
[ 3597.664314][T52604] se: weight(1048576) vruntime(372199129) slice(2800000) deadline(373867662) curr?(1) task?(0)
[ 3597.675669][T52604] se: weight(1048576) vruntime(372210583) slice(2800000) deadline(373869762) curr?(1) task?(0)
[ 3597.687025][T52604] se: weight(1048576) vruntime(372173321) slice(2800000) deadline(373870426) curr?(1) task?(0)
[ 3597.698380][T52604] se: weight(1048576) vruntime(371076345) slice(2800000) deadline(373872049) curr?(1) task?(0)
[ 3597.709739][T52604] se: weight(1048576) vruntime(371076179) slice(2800000) deadline(373872153) curr?(1) task?(0)
[ 3597.721099][T52604] se: weight(1048576) vruntime(371075876) slice(2800000) deadline(373873983) curr?(1) task?(0)
[ 3597.732458][T52604] se: weight(1048576) vruntime(372191684) slice(2800000) deadline(373880657) curr?(1) task?(0)
[ 3597.743813][T52604] se: weight(1048576) vruntime(371085624) slice(2800000) deadline(373880937) curr?(1) task?(0)
[ 3597.755171][T52604] se: weight(1048576) vruntime(371087860) slice(2800000) deadline(373881180) curr?(1) task?(0)
[ 3597.766524][T52604] se: weight(1048576) vruntime(371090613) slice(2800000) deadline(373885446) curr?(1) task?(0)
[ 3597.777880][T52604] se: weight(1048576) vruntime(372229600) slice(2800000) deadline(373887607) curr?(1) task?(0)
[ 3597.789241][T52604] se: weight(1048576) vruntime(371090183) slice(2800000) deadline(373887859) curr?(1) task?(0)
[ 3597.800599][T52604] se: weight(1048576) vruntime(372250986) slice(2800000) deadline(373889865) curr?(1) task?(0)
[ 3597.811958][T52604] se: weight(1048576) vruntime(371094367) slice(2800000) deadline(373890782) curr?(1) task?(0)
[ 3597.823314][T52604] se: weight(1048576) vruntime(371092582) slice(2800000) deadline(373890889) curr?(1) task?(0)
[ 3597.834672][T52604] se: weight(1048576) vruntime(372390457) slice(2800000) deadline(373892871) curr?(1) task?(0)
[ 3597.846025][T52604] se: weight(1048576) vruntime(372192864) slice(2800000) deadline(373893965) curr?(1) task?(0)
[ 3597.857382][T52604] se: weight(1048576) vruntime(371098935) slice(2800000) deadline(373894148) curr?(1) task?(0)
[ 3597.868739][T52604] se: weight(1048576) vruntime(371097802) slice(2800000) deadline(373896079) curr?(1) task?(0)
[ 3597.880095][T52604] se: weight(1048576) vruntime(372213677) slice(2800000) deadline(373897302) curr?(1) task?(0)
[ 3597.891455][T52604] se: weight(1048576) vruntime(371103092) slice(2800000) deadline(373897564) curr?(1) task?(0)
[ 3597.902814][T52604] se: weight(1048576) vruntime(371102930) slice(2800000) deadline(373898163) curr?(1) task?(0)
[ 3597.914170][T52604] se: weight(1048576) vruntime(372255292) slice(2800000) deadline(373898727) curr?(1) task?(0)
[ 3597.925526][T52604] se: weight(1048576) vruntime(371103333) slice(2800000) deadline(373899377) curr?(1) task?(0)
[ 3597.936882][T52604] se: weight(1048576) vruntime(372266409) slice(2800000) deadline(373902073) curr?(1) task?(0)
[ 3597.948239][T52604] se: weight(1048576) vruntime(371108369) slice(2800000) deadline(373902731) curr?(1) task?(0)
[ 3597.959599][T52604] se: weight(1048576) vruntime(371109158) slice(2800000) deadline(373907135) curr?(1) task?(0)
[ 3597.970958][T52604] se: weight(1048576) vruntime(372341244) slice(2800000) deadline(373907333) curr?(1) task?(0)
[ 3597.982315][T52604] se: weight(1048576) vruntime(371113217) slice(2800000) deadline(373910884) curr?(1) task?(0)
[ 3597.993671][T52604] se: weight(1048576) vruntime(371117746) slice(2800000) deadline(373911637) curr?(1) task?(0)
[ 3598.005027][T52604] se: weight(1048576) vruntime(371114165) slice(2800000) deadline(373911921) curr?(1) task?(0)
[ 3598.016381][T52604] se: weight(1048576) vruntime(372433446) slice(2800000) deadline(373914488) curr?(1) task?(0)
[ 3598.027738][T52604] se: weight(1048576) vruntime(372289884) slice(2800000) deadline(373914871) curr?(1) task?(0)
[ 3598.039096][T52604] se: weight(1048576) vruntime(371120196) slice(2800000) deadline(373916180) curr?(1) task?(0)
[ 3598.050453][T52604] se: weight(1048576) vruntime(371125494) slice(2800000) deadline(373919986) curr?(1) task?(0)
[ 3598.061814][T52604] se: weight(1048576) vruntime(371123799) slice(2800000) deadline(373920023) curr?(1) task?(0)
[ 3598.073171][T52604] se: weight(1048576) vruntime(372227536) slice(2800000) deadline(373922048) curr?(1) task?(0)
[ 3598.084530][T52604] se: weight(1048576) vruntime(371129084) slice(2800000) deadline(373927221) curr?(1) task?(0)
[ 3598.095885][T52604] se: weight(1048576) vruntime(372253139) slice(2800000) deadline(373927420) curr?(1) task?(0)
[ 3598.107241][T52604] se: weight(1048576) vruntime(372268082) slice(2800000) deadline(373928052) curr?(1) task?(0)
[ 3598.118591][T52604] se: weight(1048576) vruntime(371132576) slice(2800000) deadline(373930142) curr?(1) task?(0)
[ 3598.129948][T52604] se: weight(1048576) vruntime(371134600) slice(2800000) deadline(373930634) curr?(1) task?(0)
[ 3598.141308][T52604] se: weight(1048576) vruntime(371135697) slice(2800000) deadline(373931621) curr?(1) task?(0)
[ 3598.152665][T52604] se: weight(1048576) vruntime(371138991) slice(2800000) deadline(373932842) curr?(1) task?(0)
[ 3598.164021][T52604] se: weight(1048576) vruntime(371142897) slice(2800000) deadline(373936608) curr?(1) task?(0)
[ 3598.175379][T52604] se: weight(1048576) vruntime(371145007) slice(2800000) deadline(373941682) curr?(1) task?(0)
[ 3598.186734][T52604] se: weight(1048576) vruntime(372316423) slice(2800000) deadline(373944906) curr?(1) task?(0)
[ 3598.198091][T52604] se: weight(1048576) vruntime(372275832) slice(2800000) deadline(373946728) curr?(1) task?(0)
[ 3598.209450][T52604] se: weight(1048576) vruntime(372311778) slice(2800000) deadline(373953430) curr?(1) task?(0)
[ 3598.220809][T52604] se: weight(1048576) vruntime(371163824) slice(2800000) deadline(373958446) curr?(1) task?(0)
[ 3598.232169][T52604] se: weight(1048576) vruntime(372327574) slice(2800000) deadline(373959252) curr?(1) task?(0)
[ 3598.243524][T52604] se: weight(1048576) vruntime(371161963) slice(2800000) deadline(373960090) curr?(1) task?(0)
[ 3598.254881][T52604] se: weight(1048576) vruntime(371165225) slice(2800000) deadline(373960398) curr?(1) task?(0)
[ 3598.266235][T52604] se: weight(1048576) vruntime(371165692) slice(2800000) deadline(373962938) curr?(1) task?(0)
[ 3598.277592][T52604] se: weight(1048576) vruntime(371167198) slice(2800000) deadline(373964574) curr?(1) task?(0)
[ 3598.288950][T52604] se: weight(1048576) vruntime(371171540) slice(2800000) deadline(373965671) curr?(1) task?(0)
[ 3598.300305][T52604] se: weight(1048576) vruntime(371169750) slice(2800000) deadline(373967176) curr?(1) task?(0)
[ 3598.311666][T52604] se: weight(1048576) vruntime(372280071) slice(2800000) deadline(373968253) curr?(1) task?(0)
[ 3598.323024][T52604] se: weight(1048576) vruntime(371172546) slice(2800000) deadline(373969782) curr?(1) task?(0)
[ 3598.334381][T52604] se: weight(1048576) vruntime(371175396) slice(2800000) deadline(373970899) curr?(1) task?(0)
[ 3598.345737][T52604] se: weight(1048576) vruntime(372364499) slice(2800000) deadline(373971670) curr?(1) task?(0)
[ 3598.357092][T52604] se: weight(1048576) vruntime(372296634) slice(2800000) deadline(373972268) curr?(1) task?(0)
[ 3598.368447][T52604] se: weight(1048576) vruntime(371182174) slice(2800000) deadline(373977918) curr?(1) task?(0)
[ 3598.379805][T52604] se: weight(1048576) vruntime(372348147) slice(2800000) deadline(373977922) curr?(1) task?(0)
[ 3598.391165][T52604] se: weight(1048576) vruntime(372387732) slice(2800000) deadline(373979209) curr?(1) task?(0)
[ 3598.402514][T52604] se: weight(1048576) vruntime(371187382) slice(2800000) deadline(373983787) curr?(1) task?(0)
[ 3598.413869][T52604] se: weight(1048576) vruntime(371186600) slice(2800000) deadline(373984126) curr?(1) task?(0)
[ 3598.425226][T52604] se: weight(1048576) vruntime(371192352) slice(2800000) deadline(373987605) curr?(1) task?(0)
[ 3598.436581][T52604] se: weight(1048576) vruntime(371190264) slice(2800000) deadline(373988631) curr?(1) task?(0)
[ 3598.447937][T52604] se: weight(1048576) vruntime(371190716) slice(2800000) deadline(373988733) curr?(1) task?(0)
[ 3598.459296][T52604] se: weight(1048576) vruntime(371192203) slice(2800000) deadline(373990361) curr?(1) task?(0)
[ 3598.470653][T52604] se: weight(1048576) vruntime(372438545) slice(2800000) deadline(373990944) curr?(1) task?(0)
[ 3598.482014][T52604] se: weight(1048576) vruntime(371196889) slice(2800000) deadline(373991151) curr?(1) task?(0)
[ 3598.493370][T52604] se: weight(1048576) vruntime(371197429) slice(2800000) deadline(373991790) curr?(1) task?(0)
[ 3598.504728][T52604] se: weight(1048576) vruntime(371196312) slice(2800000) deadline(373994429) curr?(1) task?(0)
[ 3598.516083][T52604] se: weight(1048576) vruntime(371196839) slice(2800000) deadline(373994756) curr?(1) task?(0)
[ 3598.527440][T52604] se: weight(1048576) vruntime(371202264) slice(2800000) deadline(373996306) curr?(1) task?(0)
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[ 3602.002578][T52604] se: weight(1048576) vruntime(371680763) slice(2800000) deadline(374478660) curr?(1) task?(0)
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[ 3611.303602][T52604] se: weight(1048576) vruntime(373467209) slice(2800000) deadline(376262692) curr?(1) task?(0)
[ 3611.314962][T52604] se: weight(1048576) vruntime(373468258) slice(2800000) deadline(376263861) curr?(1) task?(0)
[ 3611.326320][T52604] se: weight(1048576) vruntime(373473251) slice(2800000) deadline(376268394) curr?(1) task?(0)
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[ 3611.383094][T52604] se: weight(1048576) vruntime(373478188) slice(2800000) deadline(376272951) curr?(1) task?(0)
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[ 3611.405800][T52604] se: weight(1048576) vruntime(373481267) slice(2800000) deadline(376275919) curr?(1) task?(0)
[ 3611.417162][T52604] se: weight(1048576) vruntime(373481413) slice(2800000) deadline(376276666) curr?(1) task?(0)
[ 3611.428520][T52604] se: weight(1048576) vruntime(373484989) slice(2800000) deadline(376279321) curr?(1) task?(0)
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[ 3611.530731][T52604] se: weight(1048576) vruntime(373511300) slice(2800000) deadline(376306262) curr?(1) task?(0)
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[ 3611.553441][T52604] se: weight(1048576) vruntime(373508279) slice(2800000) deadline(376308279) curr?(1) task?(0)
[ 3611.564800][T52604] se: weight(1048576) vruntime(373518492) slice(2800000) deadline(376313805) curr?(1) task?(0)
[ 3611.576158][T52604] se: weight(1048576) vruntime(373520333) slice(2800000) deadline(376314313) curr?(1) task?(0)
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[ 3611.610231][T52604] se: weight(1048576) vruntime(373528686) slice(2800000) deadline(376324409) curr?(1) task?(0)
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[ 3611.678366][T52604] se: weight(1048576) vruntime(373555022) slice(2800000) deadline(376350234) curr?(1) task?(0)
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[ 3611.701080][T52604] se: weight(1048576) vruntime(373565067) slice(2800000) deadline(376359739) curr?(1) task?(0)
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[ 3611.735149][T52604] se: weight(1048576) vruntime(373568664) slice(2800000) deadline(376364418) curr?(1) task?(0)
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[ 3612.450643][T52604] se: weight(1048576) vruntime(373768475) slice(2800000) deadline(376563828) curr?(1) task?(0)
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[ 3612.484710][T52604] se: weight(1048576) vruntime(373769894) slice(2800000) deadline(376564926) curr?(1) task?(0)
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[ 3613.007088][T52604] se: weight(1048576) vruntime(373838835) slice(2800000) deadline(376638835) curr?(1) task?(0)
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[ 3613.052509][T52604] se: weight(1048576) vruntime(373850982) slice(2800000) deadline(376644583) curr?(1) task?(0)
[ 3613.063865][T52604] se: weight(1048576) vruntime(373850551) slice(2800000) deadline(376644702) curr?(1) task?(0)
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[ 3613.097931][T52604] se: weight(1048576) vruntime(373852123) slice(2800000) deadline(376646855) curr?(1) task?(0)
[ 3613.109290][T52604] se: weight(1048576) vruntime(373852868) slice(2800000) deadline(376647149) curr?(1) task?(0)
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[ 3613.143355][T52604] se: weight(1048576) vruntime(373861851) slice(2800000) deadline(376655141) curr?(1) task?(0)
[ 3613.154710][T52604] se: weight(1048576) vruntime(373860388) slice(2800000) deadline(376656482) curr?(1) task?(0)
[ 3613.166070][T52604] se: weight(1048576) vruntime(373861482) slice(2800000) deadline(376658177) curr?(1) task?(0)
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[ 3613.188771][T52604] se: weight(1048576) vruntime(373868503) slice(2800000) deadline(376663465) curr?(1) task?(0)
[ 3613.200127][T52604] se: weight(1048576) vruntime(373871159) slice(2800000) deadline(376665270) curr?(1) task?(0)
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[ 3613.222836][T52604] se: weight(1048576) vruntime(373876166) slice(2800000) deadline(376670147) curr?(1) task?(0)
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[ 3613.256911][T52604] se: weight(1048576) vruntime(373882685) slice(2800000) deadline(376676166) curr?(1) task?(0)
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[ 3614.233593][T52604] se: weight(1048576) vruntime(374115634) slice(2800000) deadline(376911347) curr?(1) task?(0)
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[ 3614.381223][T52604] se: weight(1048576) vruntime(374157433) slice(2800000) deadline(376952365) curr?(1) task?(0)
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[ 3614.665144][T52604] se: weight(1048576) vruntime(374204702) slice(2800000) deadline(377000055) curr?(1) task?(0)
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[ 3614.733279][T52604] se: weight(1048576) vruntime(374210663) slice(2800000) deadline(377010663) curr?(1) task?(0)
[ 3614.744635][T52604] se: weight(1048576) vruntime(374216582) slice(2800000) deadline(377012105) curr?(1) task?(0)
[ 3614.755984][T52604] se: weight(1048576) vruntime(374221163) slice(2800000) deadline(377014102) curr?(1) task?(0)
[ 3614.767342][T52604] se: weight(1048576) vruntime(374219721) slice(2800000) deadline(377014974) curr?(1) task?(0)
[ 3614.778702][T52604] se: weight(1048576) vruntime(374220595) slice(2800000) deadline(377015588) curr?(1) task?(0)
[ 3614.790062][T52604] se: weight(1048576) vruntime(374220778) slice(2800000) deadline(377016171) curr?(1) task?(0)
[ 3614.801421][T52604] se: weight(1048576) vruntime(374222695) slice(2800000) deadline(377016757) curr?(1) task?(0)
[ 3614.812775][T52604] se: weight(1048576) vruntime(374223168) slice(2800000) deadline(377018120) curr?(1) task?(0)
[ 3614.824130][T52604] se: weight(1048576) vruntime(374227579) slice(2800000) deadline(377021550) curr?(1) task?(0)
[ 3614.835486][T52604] se: weight(1048576) vruntime(374226460) slice(2800000) deadline(377021793) curr?(1) task?(0)
[ 3614.846846][T52604] se: weight(1048576) vruntime(374230075) slice(2800000) deadline(377024106) curr?(1) task?(0)
[ 3614.858197][T52604] se: weight(1048576) vruntime(374230223) slice(2800000) deadline(377024565) curr?(1) task?(0)
[ 3614.869546][T52604] se: weight(1048576) vruntime(374230694) slice(2800000) deadline(377024735) curr?(1) task?(0)
[ 3614.880903][T52604] se: weight(1048576) vruntime(374230460) slice(2800000) deadline(377025233) curr?(1) task?(0)
[ 3614.892260][T52604] se: weight(1048576) vruntime(374230479) slice(2800000) deadline(377025592) curr?(1) task?(0)
[ 3614.903613][T52604] se: weight(1048576) vruntime(374232249) slice(2800000) deadline(377027161) curr?(1) task?(0)
[ 3614.914969][T52604] se: weight(1048576) vruntime(374233127) slice(2800000) deadline(377027178) curr?(1) task?(0)
[ 3614.926328][T52604] se: weight(1048576) vruntime(374232979) slice(2800000) deadline(377028463) curr?(1) task?(0)
[ 3614.937686][T52604] se: weight(1048576) vruntime(374228748) slice(2800000) deadline(377028748) curr?(1) task?(0)
[ 3614.949047][T52604] se: weight(1048576) vruntime(374235876) slice(2800000) deadline(377029496) curr?(1) task?(0)
[ 3614.960404][T52604] se: weight(1048576) vruntime(374234505) slice(2800000) deadline(377030008) curr?(1) task?(0)
[ 3614.971753][T52604] se: weight(1048576) vruntime(374236346) slice(2800000) deadline(377031769) curr?(1) task?(0)
[ 3614.983107][T52604] se: weight(1048576) vruntime(374237351) slice(2800000) deadline(377032313) curr?(1) task?(0)
[ 3614.994463][T52604] se: weight(1048576) vruntime(374238982) slice(2800000) deadline(377034104) curr?(1) task?(0)
[ 3615.005822][T52604] se: weight(1048576) vruntime(374246034) slice(2800000) deadline(377039784) curr?(1) task?(0)
[ 3615.017180][T52604] se: weight(1048576) vruntime(374246209) slice(2800000) deadline(377041011) curr?(1) task?(0)
[ 3615.028542][T52604] se: weight(1048576) vruntime(374250580) slice(2800000) deadline(377047785) curr?(1) task?(0)
[ 3615.039892][T52604] se: weight(1048576) vruntime(374255085) slice(2800000) deadline(377047854) curr?(1) task?(0)
[ 3615.051248][T52604] se: weight(1048576) vruntime(374254261) slice(2800000) deadline(377048913) curr?(1) task?(0)
[ 3615.062604][T52604] se: weight(1048576) vruntime(374256209) slice(2800000) deadline(377050080) curr?(1) task?(0)
[ 3615.073959][T52604] se: weight(1048576) vruntime(374256251) slice(2800000) deadline(377051394) curr?(1) task?(0)
[ 3615.085315][T52604] se: weight(1048576) vruntime(374262661) slice(2800000) deadline(377056372) curr?(1) task?(0)
[ 3615.096675][T52604] se: weight(1048576) vruntime(374263961) slice(2800000) deadline(377057071) curr?(1) task?(0)
[ 3615.108033][T52604] se: weight(1048576) vruntime(374262448) slice(2800000) deadline(377057801) curr?(1) task?(0)
[ 3615.119383][T52604] se: weight(1048576) vruntime(374264270) slice(2800000) deadline(377058672) curr?(1) task?(0)
[ 3615.130740][T52604] se: weight(1048576) vruntime(374264795) slice(2800000) deadline(377059807) curr?(1) task?(0)
[ 3615.142097][T52604] se: weight(1048576) vruntime(374265764) slice(2800000) deadline(377061057) curr?(1) task?(0)
[ 3615.153450][T52604] se: weight(1048576) vruntime(374266409) slice(2800000) deadline(377061422) curr?(1) task?(0)
[ 3615.164807][T52604] se: weight(1048576) vruntime(374267596) slice(2800000) deadline(377062168) curr?(1) task?(0)
[ 3615.176165][T52604] se: weight(1048576) vruntime(374269089) slice(2800000) deadline(377063180) curr?(1) task?(0)
[ 3615.187522][T52604] se: weight(1048576) vruntime(374263601) slice(2800000) deadline(377063601) curr?(1) task?(0)
[ 3615.198883][T52604] se: weight(1048576) vruntime(374269738) slice(2800000) deadline(377064810) curr?(1) task?(0)
[ 3615.210241][T52604] se: weight(1048576) vruntime(374275369) slice(2800000) deadline(377070472) curr?(1) task?(0)
[ 3615.221600][T52604] se: weight(1048576) vruntime(374279342) slice(2800000) deadline(377079342) curr?(1) task?(0)
[ 3615.232953][T52604] se: weight(1048576) vruntime(374287283) slice(2800000) deadline(377080763) curr?(1) task?(0)
[ 3615.244310][T52604] se: weight(1048576) vruntime(374289071) slice(2800000) deadline(377081780) curr?(1) task?(0)
[ 3615.255666][T52604] se: weight(1048576) vruntime(374289152) slice(2800000) deadline(377084284) curr?(1) task?(0)
[ 3615.267025][T52604] se: weight(1048576) vruntime(374292490) slice(2800000) deadline(377085920) curr?(1) task?(0)
[ 3615.278377][T52604] se: weight(1048576) vruntime(374291822) slice(2800000) deadline(377086634) curr?(1) task?(0)
[ 3615.289734][T52604] se: weight(1048576) vruntime(374292388) slice(2800000) deadline(377087390) curr?(1) task?(0)
[ 3615.301091][T52604] se: weight(1048576) vruntime(374296477) slice(2800000) deadline(377088045) curr?(1) task?(0)
[ 3615.312449][T52604] se: weight(1048576) vruntime(374292763) slice(2800000) deadline(377088055) curr?(1) task?(0)
[ 3615.323804][T52604] se: weight(1048576) vruntime(374294138) slice(2800000) deadline(377090893) curr?(1) task?(0)
[ 3615.335161][T52604] se: weight(1048576) vruntime(374298472) slice(2800000) deadline(377091071) curr?(1) task?(0)
[ 3615.346519][T52604] se: weight(1048576) vruntime(374296924) slice(2800000) deadline(377092678) curr?(1) task?(0)
[ 3615.357876][T52604] se: weight(1048576) vruntime(374303334) slice(2800000) deadline(377097065) curr?(1) task?(0)
[ 3615.369234][T52604] se: weight(1048576) vruntime(374302565) slice(2800000) deadline(377097868) curr?(1) task?(0)
[ 3615.380591][T52604] se: weight(1048576) vruntime(374303888) slice(2800000) deadline(377099051) curr?(1) task?(0)
[ 3615.391949][T52604] se: weight(1048576) vruntime(374305829) slice(2800000) deadline(377100291) curr?(1) task?(0)
[ 3615.403303][T52604] se: weight(1048576) vruntime(374305899) slice(2800000) deadline(377100480) curr?(1) task?(0)
[ 3615.414659][T52604] se: weight(1048576) vruntime(374309282) slice(2800000) deadline(377104646) curr?(1) task?(0)
[ 3615.426018][T52604] se: weight(1048576) vruntime(374316267) slice(2800000) deadline(377110369) curr?(1) task?(0)
[ 3615.437375][T52604] se: weight(1048576) vruntime(374319818) slice(2800000) deadline(377111716) curr?(1) task?(0)
[ 3615.448727][T52604] se: weight(1048576) vruntime(374317314) slice(2800000) deadline(377112307) curr?(1) task?(0)
[ 3615.460077][T52604] se: weight(1048576) vruntime(374319214) slice(2800000) deadline(377112464) curr?(1) task?(0)
[ 3615.471434][T52604] se: weight(1048576) vruntime(374332155) slice(2800000) deadline(377127368) curr?(1) task?(0)
[ 3615.482789][T52604] se: weight(1048576) vruntime(374335808) slice(2800000) deadline(377129779) curr?(1) task?(0)
[ 3615.494143][T52604] se: weight(1048576) vruntime(374335413) slice(2800000) deadline(377129925) curr?(1) task?(0)
[ 3615.505500][T52604] se: weight(1048576) vruntime(374337876) slice(2800000) deadline(377131476) curr?(1) task?(0)
[ 3615.516849][T52604] se: weight(1048576) vruntime(374341305) slice(2800000) deadline(377141305) curr?(1) task?(0)
[ 3615.528208][T52604] se: weight(1048576) vruntime(374358285) slice(2800000) deadline(377152216) curr?(1) task?(0)
[ 3615.539568][T52604] se: weight(1048576) vruntime(374358421) slice(2800000) deadline(377154345) curr?(1) task?(0)
[ 3615.550925][T52604] se: weight(1048576) vruntime(374361565) slice(2800000) deadline(377156277) curr?(1) task?(0)
[ 3615.562281][T52604] se: weight(1048576) vruntime(374366003) slice(2800000) deadline(377158261) curr?(1) task?(0)
[ 3615.573635][T52604] se: weight(1048576) vruntime(374364658) slice(2800000) deadline(377158769) curr?(1) task?(0)
[ 3615.584993][T52604] se: weight(1048576) vruntime(374364444) slice(2800000) deadline(377159346) curr?(1) task?(0)
[ 3615.596350][T52604] se: weight(1048576) vruntime(374362499) slice(2800000) deadline(377162499) curr?(1) task?(0)
[ 3615.607709][T52604] se: weight(1048576) vruntime(374373854) slice(2800000) deadline(377165161) curr?(1) task?(0)
[ 3615.619069][T52604] se: weight(1048576) vruntime(374376127) slice(2800000) deadline(377169517) curr?(1) task?(0)
[ 3615.630428][T52604] se: weight(1048576) vruntime(374377966) slice(2800000) deadline(377172638) curr?(1) task?(0)
[ 3615.641785][T52604] se: weight(1048576) vruntime(374379406) slice(2800000) deadline(377174508) curr?(1) task?(0)
[ 3615.653140][T52604] se: weight(1048576) vruntime(374376184) slice(2800000) deadline(377176184) curr?(1) task?(0)
[ 3615.664496][T52604] se: weight(1048576) vruntime(374381263) slice(2800000) deadline(377176826) curr?(1) task?(0)
[ 3615.675852][T52604] se: weight(1048576) vruntime(374383129) slice(2800000) deadline(377178462) curr?(1) task?(0)
[ 3615.687210][T52604] se: weight(1048576) vruntime(374385987) slice(2800000) deadline(377180099) curr?(1) task?(0)
[ 3615.698569][T52604] se: weight(1048576) vruntime(374387258) slice(2800000) deadline(377182540) curr?(1) task?(0)
[ 3615.709919][T52604] se: weight(1048576) vruntime(374388750) slice(2800000) deadline(377183112) curr?(1) task?(0)
[ 3615.721277][T52604] se: weight(1048576) vruntime(374390932) slice(2800000) deadline(377186185) curr?(1) task?(0)
[ 3615.732634][T52604] se: weight(1048576) vruntime(374394713) slice(2800000) deadline(377186500) curr?(1) task?(0)
[ 3615.743988][T52604] se: weight(1048576) vruntime(374394242) slice(2800000) deadline(377189045) curr?(1) task?(0)
[ 3615.755346][T52604] se: weight(1048576) vruntime(374395325) slice(2800000) deadline(377190428) curr?(1) task?(0)
[ 3615.766705][T52604] se: weight(1048576) vruntime(374396229) slice(2800000) deadline(377191672) curr?(1) task?(0)
[ 3615.778063][T52604] se: weight(1048576) vruntime(374396682) slice(2800000) deadline(377191945) curr?(1) task?(0)
[ 3615.789424][T52604] se: weight(1048576) vruntime(374399522) slice(2800000) deadline(377194355) curr?(1) task?(0)
[ 3615.800781][T52604] se: weight(1048576) vruntime(374401311) slice(2800000) deadline(377195222) curr?(1) task?(0)
[ 3615.812130][T52604] se: weight(1048576) vruntime(374401409) slice(2800000) deadline(377196542) curr?(1) task?(0)
[ 3615.823485][T52604] se: weight(1048576) vruntime(374402505) slice(2800000) deadline(377197408) curr?(1) task?(0)
[ 3615.834841][T52604] se: weight(1048576) vruntime(374409704) slice(2800000) deadline(377204866) curr?(1) task?(0)
[ 3615.846190][T52604] se: weight(1048576) vruntime(374410091) slice(2800000) deadline(377205775) curr?(1) task?(0)
[ 3615.857548][T52604] se: weight(1048576) vruntime(374406331) slice(2800000) deadline(377206331) curr?(1) task?(0)
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[ 3615.880269][T52604] se: weight(1048576) vruntime(374415323) slice(2800000) deadline(377210295) curr?(1) task?(0)
[ 3615.891625][T52604] se: weight(1048576) vruntime(374421182) slice(2800000) deadline(377214081) curr?(1) task?(0)
[ 3615.902982][T52604] se: weight(1048576) vruntime(374421259) slice(2800000) deadline(377215581) curr?(1) task?(0)
[ 3615.914337][T52604] se: weight(1048576) vruntime(374422667) slice(2800000) deadline(377216979) curr?(1) task?(0)
[ 3615.925691][T52604] se: weight(1048576) vruntime(374422554) slice(2800000) deadline(377217236) curr?(1) task?(0)
[ 3615.937052][T52604] se: weight(1048576) vruntime(374424934) slice(2800000) deadline(377220077) curr?(1) task?(0)
[ 3615.948411][T52604] se: weight(1048576) vruntime(374425846) slice(2800000) deadline(377222020) curr?(1) task?(0)
[ 3615.959760][T52604] se: weight(1048576) vruntime(374429395) slice(2800000) deadline(377222064) curr?(1) task?(0)
[ 3615.971116][T52604] se: weight(1048576) vruntime(374433944) slice(2800000) deadline(377229067) curr?(1) task?(0)
[ 3615.982473][T52604] se: weight(1048576) vruntime(374436086) slice(2800000) deadline(377230788) curr?(1) task?(0)
[ 3615.993827][T52604] se: weight(1048576) vruntime(374437470) slice(2800000) deadline(377233104) curr?(1) task?(0)
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[ 3616.300480][T52604] se: weight(1048576) vruntime(374505915) slice(2800000) deadline(377299956) curr?(1) task?(0)
[ 3616.311836][T52604] se: weight(1048576) vruntime(374505598) slice(2800000) deadline(377301092) curr?(1) task?(0)
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[ 3616.402690][T52604] se: weight(1048576) vruntime(374522122) slice(2800000) deadline(377317455) curr?(1) task?(0)
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[ 3616.425400][T52604] se: weight(1048576) vruntime(374519270) slice(2800000) deadline(377319270) curr?(1) task?(0)
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[ 3616.448116][T52604] se: weight(1048576) vruntime(374529587) slice(2800000) deadline(377323518) curr?(1) task?(0)
[ 3616.459476][T52604] se: weight(1048576) vruntime(374529085) slice(2800000) deadline(377324408) curr?(1) task?(0)
[ 3616.470834][T52604] se: weight(1048576) vruntime(374532479) slice(2800000) deadline(377332479) curr?(1) task?(0)
[ 3616.482193][T52604] se: weight(1048576) vruntime(374538915) slice(2800000) deadline(377332906) curr?(1) task?(0)
[ 3616.493548][T52604] se: weight(1048576) vruntime(374539281) slice(2800000) deadline(377334243) curr?(1) task?(0)
[ 3616.504903][T52604] se: weight(1048576) vruntime(374541610) slice(2800000) deadline(377334720) curr?(1) task?(0)
[ 3616.516260][T52604] se: weight(1048576) vruntime(374542667) slice(2800000) deadline(377335076) curr?(1) task?(0)
[ 3616.527618][T52604] se: weight(1048576) vruntime(374544155) slice(2800000) deadline(377335652) curr?(1) task?(0)
[ 3616.538978][T52604] se: weight(1048576) vruntime(374547515) slice(2800000) deadline(377342928) curr?(1) task?(0)
[ 3616.550337][T52604] se: weight(1048576) vruntime(374549772) slice(2800000) deadline(377344654) curr?(1) task?(0)
[ 3616.561693][T52604] se: weight(1048576) vruntime(374552573) slice(2800000) deadline(377346304) curr?(1) task?(0)
[ 3616.573051][T52604] se: weight(1048576) vruntime(374551013) slice(2800000) deadline(377351013) curr?(1) task?(0)
[ 3616.584405][T52604] se: weight(1048576) vruntime(374557252) slice(2800000) deadline(377352184) curr?(1) task?(0)
[ 3616.595760][T52604] se: weight(1048576) vruntime(374570427) slice(2800000) deadline(377364428) curr?(1) task?(0)
[ 3616.607110][T52604] se: weight(1048576) vruntime(374573378) slice(2800000) deadline(377368791) curr?(1) task?(0)
[ 3616.618468][T52604] se: weight(1048576) vruntime(374577388) slice(2800000) deadline(377369095) curr?(1) task?(0)
[ 3616.629827][T52604] se: weight(1048576) vruntime(374579872) slice(2800000) deadline(377374914) curr?(1) task?(0)
[ 3616.641185][T52604] se: weight(1048576) vruntime(374576670) slice(2800000) deadline(377376670) curr?(1) task?(0)
[ 3616.652542][T52604] se: weight(1048576) vruntime(374584099) slice(2800000) deadline(377379281) curr?(1) task?(0)
[ 3616.663897][T52604] se: weight(1048576) vruntime(374584660) slice(2800000) deadline(377384660) curr?(1) task?(0)
[ 3616.675253][T52604] se: weight(1048576) vruntime(374596006) slice(2800000) deadline(377391469) curr?(1) task?(0)
[ 3616.686610][T52604] se: weight(1048576) vruntime(374600030) slice(2800000) deadline(377392098) curr?(1) task?(0)
[ 3616.697965][T52604] se: weight(1048576) vruntime(374604603) slice(2800000) deadline(377398464) curr?(1) task?(0)
[ 3616.709328][T52604] se: weight(1048576) vruntime(374605621) slice(2800000) deadline(377401355) curr?(1) task?(0)
[ 3616.720688][T52604] se: weight(1048576) vruntime(374612188) slice(2800000) deadline(377404226) curr?(1) task?(0)
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[ 3616.766111][T52604] se: weight(1048576) vruntime(374620666) slice(2800000) deadline(377416039) curr?(1) task?(0)
[ 3616.777462][T52604] se: weight(1048576) vruntime(374627340) slice(2800000) deadline(377422633) curr?(1) task?(0)
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[ 3616.800170][T52604] se: weight(1048576) vruntime(374636211) slice(2800000) deadline(377431624) curr?(1) task?(0)
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[ 3617.742767][T52604] se: weight(1048576) vruntime(374845913) slice(2800000) deadline(377640996) curr?(1) task?(0)
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[ 3619.412202][T52604] se: weight(1048576) vruntime(375741505) slice(2800000) deadline(378535016) curr?(1) task?(0)
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[ 3619.434913][T52604] se: weight(1048576) vruntime(375755709) slice(2800000) deadline(378549470) curr?(1) task?(0)
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[ 3619.457627][T52604] se: weight(1048576) vruntime(375759239) slice(2800000) deadline(378553491) curr?(1) task?(0)
[ 3619.468987][T52604] se: weight(1048576) vruntime(375765940) slice(2800000) deadline(378558069) curr?(1) task?(0)
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[ 3619.491697][T52604] se: weight(1048576) vruntime(375774807) slice(2800000) deadline(378568918) curr?(1) task?(0)
[ 3619.503053][T52604] se: weight(1048576) vruntime(375780215) slice(2800000) deadline(378573675) curr?(1) task?(0)
[ 3619.514410][T52604] se: weight(1048576) vruntime(375792903) slice(2800000) deadline(378586103) curr?(1) task?(0)
[ 3619.525764][T52604] se: weight(1048576) vruntime(375793568) slice(2800000) deadline(378590493) curr?(1) task?(0)
[ 3619.537120][T52604] se: weight(1048576) vruntime(375800015) slice(2800000) deadline(378594396) curr?(1) task?(0)
[ 3619.548478][T52604] se: weight(1048576) vruntime(375808427) slice(2800000) deadline(378601276) curr?(1) task?(0)
[ 3619.559836][T52604] se: weight(1048576) vruntime(375807013) slice(2800000) deadline(378602236) curr?(1) task?(0)
[ 3619.571195][T52604] se: weight(1048576) vruntime(375814188) slice(2800000) deadline(378608359) curr?(1) task?(0)
[ 3619.582553][T52604] se: weight(1048576) vruntime(375827605) slice(2800000) deadline(378621235) curr?(1) task?(0)
[ 3619.593910][T52604] se: weight(1048576) vruntime(375849735) slice(2800000) deadline(378643416) curr?(1) task?(0)
[ 3619.605264][T52604] se: weight(1048576) vruntime(375863441) slice(2800000) deadline(378655018) curr?(1) task?(0)
[ 3619.616620][T52604] se: weight(1048576) vruntime(375873585) slice(2800000) deadline(378664682) curr?(1) task?(0)
[ 3619.627979][T52604] se: weight(1048576) vruntime(375879581) slice(2800000) deadline(378673021) curr?(1) task?(0)
[ 3619.639336][T52604] se: weight(1048576) vruntime(375884839) slice(2800000) deadline(378678039) curr?(1) task?(0)
[ 3619.650697][T52604] se: weight(1048576) vruntime(375881184) slice(2800000) deadline(378681184) curr?(1) task?(0)
[ 3619.662057][T52604] se: weight(1048576) vruntime(375897230) slice(2800000) deadline(378690410) curr?(1) task?(0)
[ 3619.673413][T52604] se: weight(1048576) vruntime(375896110) slice(2800000) deadline(378696110) curr?(1) task?(0)
[ 3619.684768][T52604] se: weight(1048576) vruntime(375905541) slice(2800000) deadline(378696858) curr?(1) task?(0)
[ 3619.696123][T52604] se: weight(1048576) vruntime(375906892) slice(2800000) deadline(378702115) curr?(1) task?(0)
[ 3619.707481][T52604] se: weight(1048576) vruntime(375915733) slice(2800000) deadline(378710175) curr?(1) task?(0)
[ 3619.718840][T52604] se: weight(1048576) vruntime(375917549) slice(2800000) deadline(378713093) curr?(1) task?(0)
[ 3619.730190][T52604] se: weight(1048576) vruntime(375930726) slice(2800000) deadline(378724256) curr?(1) task?(0)
[ 3619.741548][T52604] se: weight(1048576) vruntime(375931981) slice(2800000) deadline(378725421) curr?(1) task?(0)
[ 3619.752904][T52604] se: weight(1048576) vruntime(375942373) slice(2800000) deadline(378735703) curr?(1) task?(0)
[ 3619.764251][T52604] se: weight(1048576) vruntime(375946183) slice(2800000) deadline(378739373) curr?(1) task?(0)
[ 3619.775603][T52604] se: weight(1048576) vruntime(375961997) slice(2800000) deadline(378755678) curr?(1) task?(0)
[ 3619.786959][T52604] se: weight(1048576) vruntime(375973086) slice(2800000) deadline(378766105) curr?(1) task?(0)
[ 3619.798317][T52604] se: weight(1048576) vruntime(375976777) slice(2800000) deadline(378771319) curr?(1) task?(0)
[ 3619.809675][T52604] se: weight(1048576) vruntime(375980085) slice(2800000) deadline(378774337) curr?(1) task?(0)
[ 3619.821035][T52604] se: weight(1048576) vruntime(375991218) slice(2800000) deadline(378784909) curr?(1) task?(0)
[ 3619.832392][T52604] se: weight(1048576) vruntime(375995544) slice(2800000) deadline(378789205) curr?(1) task?(0)
[ 3619.843750][T52604] se: weight(1048576) vruntime(376005426) slice(2800000) deadline(378798666) curr?(1) task?(0)
[ 3619.855105][T52604] se: weight(1048576) vruntime(376008945) slice(2800000) deadline(378802355) curr?(1) task?(0)
[ 3619.866461][T52604] se: weight(1048576) vruntime(376020094) slice(2800000) deadline(378813004) curr?(1) task?(0)
[ 3619.877821][T52604] se: weight(1048576) vruntime(376014251) slice(2800000) deadline(378814251) curr?(1) task?(0)
[ 3619.889179][T52604] se: weight(1048576) vruntime(376024819) slice(2800000) deadline(378817498) curr?(1) task?(0)
[ 3619.900539][T52604] se: weight(1048576) vruntime(376033201) slice(2800000) deadline(378826121) curr?(1) task?(0)
[ 3619.911897][T52604] se: weight(1048576) vruntime(376047357) slice(2800000) deadline(378841048) curr?(1) task?(0)
[ 3619.923253][T52604] se: weight(1048576) vruntime(376070306) slice(2800000) deadline(378861112) curr?(1) task?(0)
[ 3619.934611][T52604] se: weight(1048576) vruntime(376069117) slice(2800000) deadline(378862297) curr?(1) task?(0)
[ 3619.945966][T52604] se: weight(1048576) vruntime(376095783) slice(2800000) deadline(378888282) curr?(1) task?(0)
[ 3619.957322][T52604] se: weight(1048576) vruntime(376120673) slice(2800000) deadline(378911639) curr?(1) task?(0)
[ 3619.968682][T52604] se: weight(1048576) vruntime(376121362) slice(2800000) deadline(378913390) curr?(1) task?(0)
[ 3619.980039][T52604] se: weight(1048576) vruntime(376119895) slice(2800000) deadline(378913836) curr?(1) task?(0)
[ 3619.991400][T52604] se: weight(1048576) vruntime(376122168) slice(2800000) deadline(378915658) curr?(1) task?(0)
[ 3620.002756][T52604] se: weight(1048576) vruntime(376123889) slice(2800000) deadline(378917169) curr?(1) task?(0)
[ 3620.014112][T52604] se: weight(1048576) vruntime(376133787) slice(2800000) deadline(378926997) curr?(1) task?(0)
[ 3620.025466][T52604] se: weight(1048576) vruntime(376134365) slice(2800000) deadline(378931180) curr?(1) task?(0)
[ 3620.036822][T52604] se: weight(1048576) vruntime(376143970) slice(2800000) deadline(378935337) curr?(1) task?(0)
[ 3620.048181][T52604] se: weight(1048576) vruntime(376142634) slice(2800000) deadline(378935604) curr?(1) task?(0)
[ 3620.059538][T52604] se: weight(1048576) vruntime(376145740) slice(2800000) deadline(378939671) curr?(1) task?(0)
[ 3620.070900][T52604] se: weight(1048576) vruntime(376144431) slice(2800000) deadline(378941367) curr?(1) task?(0)
[ 3620.082260][T52604] se: weight(1048576) vruntime(376143994) slice(2800000) deadline(378943994) curr?(1) task?(0)
[ 3620.093617][T52604] se: weight(1048576) vruntime(376156518) slice(2800000) deadline(378947024) curr?(1) task?(0)
[ 3620.104973][T52604] se: weight(1048576) vruntime(376162799) slice(2800000) deadline(378956599) curr?(1) task?(0)
[ 3620.116329][T52604] se: weight(1048576) vruntime(376168055) slice(2800000) deadline(378961936) curr?(1) task?(0)
[ 3620.127684][T52604] se: weight(1048576) vruntime(376178010) slice(2800000) deadline(378970909) curr?(1) task?(0)
[ 3620.139044][T52604] se: weight(1048576) vruntime(376201797) slice(2800000) deadline(379001797) curr?(1) task?(0)
[ 3620.150403][T52604] se: weight(1048576) vruntime(376230831) slice(2800000) deadline(379024251) curr?(1) task?(0)
[ 3620.161752][T52604] se: weight(1048576) vruntime(376235497) slice(2800000) deadline(379030139) curr?(1) task?(0)
[ 3620.173108][T52604] se: weight(1048576) vruntime(376244654) slice(2800000) deadline(379038124) curr?(1) task?(0)
[ 3620.184465][T52604] se: weight(1048576) vruntime(376283705) slice(2800000) deadline(379079038) curr?(1) task?(0)
[ 3620.195819][T52604] se: weight(1048576) vruntime(376345645) slice(2800000) deadline(379139987) curr?(1) task?(0)
[ 3620.207178][T52604] se: weight(1048576) vruntime(376346819) slice(2800000) deadline(379146819) curr?(1) task?(0)
[ 3620.218535][T52604] se: weight(1048576) vruntime(376385884) slice(2800000) deadline(379175608) curr?(1) task?(0)
[ 3620.229891][T52604] se: weight(1048576) vruntime(376396248) slice(2800000) deadline(379189618) curr?(1) task?(0)
[ 3620.241251][T52604] se: weight(1048576) vruntime(376428620) slice(2800000) deadline(379223623) curr?(1) task?(0)
[ 3620.252610][T52604] se: weight(1048576) vruntime(376499548) slice(2800000) deadline(379294380) curr?(1) task?(0)
[ 3620.263967][T52604] se: weight(1048576) vruntime(376572281) slice(2800000) deadline(379365641) curr?(1) task?(0)
[ 3620.275322][T52604] se: weight(1048576) vruntime(376591897) slice(2800000) deadline(379385487) curr?(1) task?(0)
[ 3620.286677][T52604] se: weight(1048576) vruntime(376762253) slice(2800000) deadline(379558738) curr?(1) task?(0)
[ 3620.298035][T52604] se: weight(1048576) vruntime(376775262) slice(2800000) deadline(379575262) curr?(1) task?(0)
[ 3620.309393][T52604] se: weight(1048576) vruntime(376872694) slice(2800000) deadline(379667125) curr?(1) task?(0)
[ 3620.320753][T52604] se: weight(1048576) vruntime(376951672) slice(2800000) deadline(379746565) curr?(1) task?(0)
[ 3620.332112][T52604] se: weight(1048576) vruntime(376975946) slice(2800000) deadline(379768796) curr?(1) task?(0)
[ 3620.343469][T52604] se: weight(1048576) vruntime(376992379) slice(2800000) deadline(379787071) curr?(1) task?(0)
[ 3620.354825][T52604] se: weight(1048576) vruntime(377003763) slice(2800000) deadline(379798725) curr?(1) task?(0)
[ 3620.366179][T52604] se: weight(1048576) vruntime(377019516) slice(2800000) deadline(379814859) curr?(1) task?(0)
[ 3620.377536][T52604] se: weight(1048576) vruntime(377073943) slice(2800000) deadline(379868605) curr?(1) task?(0)
[ 3620.388894][T52604] se: weight(1048576) vruntime(377153630) slice(2800000) deadline(379948783) curr?(1) task?(0)
[ 3620.400253][T52604] se: weight(1048576) vruntime(377157752) slice(2800000) deadline(379952334) curr?(1) task?(0)
[ 3620.411613][T52604] se: weight(1048576) vruntime(377242232) slice(2800000) deadline(380037796) curr?(1) task?(0)
[ 3620.422969][T52604] se: weight(1048576) vruntime(377327657) slice(2800000) deadline(380122719) curr?(1) task?(0)
[ 3620.434317][T52604] se: weight(1048576) vruntime(377334887) slice(2800000) deadline(380127776) curr?(1) task?(0)
[ 3620.445674][T52604] Full hierarchy from root:
[ 3620.450532][T52604] cfs_rq: depth(0) weight(157614) nr_queued(1) sum_w_vruntime(0) sum_weight(0) zero_vruntime(1665159823107) sum_shift(0) avg_vruntime(1665159823107)
[ 3620.467125][T52604] se: weight(157614) vruntime(1665159823107) slice(2800000) deadline(1665178544075) curr?(1) task?(1)
[ 3620.479165][T52604] cfs_rq: depth(1) weight(2150629376) nr_queued(2051) sum_w_vruntime(-8308577825720369152) sum_weight(2149580800) zero_vruntime(18446744069366398443) sum_shift(0) avg_vruntime(18446744069366398443)
[ 3620.500614][T52604] se: weight(1048576) vruntime(18446744069623207599) slice(2800000) deadline(18446744069626004775) curr?(1) task?(0)
[ 3620.514202][T52604] se: weight(1048576) vruntime(373218199) slice(2800000) deadline(373446702) curr?(1) task?(0)
[ 3620.525657][T52604] se: weight(1048576) vruntime(371876685) slice(2800000) deadline(373815965) curr?(1) task?(0)
[ 3620.537110][T52604] se: weight(1048576) vruntime(372314317) slice(2800000) deadline(373817932) curr?(1) task?(0)
[ 3620.548562][T52604] se: weight(1048576) vruntime(371022075) slice(2800000) deadline(373819151) curr?(1) task?(0)
[ 3620.560019][T52604] se: weight(1048576) vruntime(371021926) slice(2800000) deadline(373819933) curr?(1) task?(0)
[ 3620.571476][T52604] se: weight(1048576) vruntime(371024680) slice(2800000) deadline(373820994) curr?(1) task?(0)
[ 3620.582922][T52604] se: weight(1048576) vruntime(371025329) slice(2800000) deadline(373822054) curr?(1) task?(0)
[ 3620.594375][T52604] se: weight(1048576) vruntime(371025579) slice(2800000) deadline(373823416) curr?(1) task?(0)
[ 3620.605829][T52604] se: weight(1048576) vruntime(371029988) slice(2800000) deadline(373824850) curr?(1) task?(0)
[ 3620.617279][T52604] se: weight(1048576) vruntime(371026685) slice(2800000) deadline(373824923) curr?(1) task?(0)
[ 3620.628733][T52604] se: weight(1048576) vruntime(371028210) slice(2800000) deadline(373825326) curr?(1) task?(0)
[ 3620.640189][T52604] se: weight(1048576) vruntime(371027706) slice(2800000) deadline(373825413) curr?(1) task?(0)
[ 3620.651644][T52604] se: weight(1048576) vruntime(372171878) slice(2800000) deadline(373826550) curr?(1) task?(0)
[ 3620.663101][T52604] se: weight(1048576) vruntime(371030162) slice(2800000) deadline(373826987) curr?(1) task?(0)
[ 3620.674556][T52604] se: weight(1048576) vruntime(371031553) slice(2800000) deadline(373827607) curr?(1) task?(0)
[ 3620.686010][T52604] se: weight(1048576) vruntime(371046374) slice(2800000) deadline(373829839) curr?(1) task?(0)
[ 3620.697461][T52604] se: weight(1048576) vruntime(372141770) slice(2800000) deadline(373830273) curr?(1) task?(0)
[ 3620.708915][T52604] se: weight(1048576) vruntime(371034528) slice(2800000) deadline(373832655) curr?(1) task?(0)
[ 3620.720369][T52604] se: weight(1048576) vruntime(371035278) slice(2800000) deadline(373833104) curr?(1) task?(0)
[ 3620.731822][T52604] se: weight(1048576) vruntime(371035992) slice(2800000) deadline(373833889) curr?(1) task?(0)
[ 3620.743271][T52604] se: weight(1048576) vruntime(371037150) slice(2800000) deadline(373833925) curr?(1) task?(0)
[ 3620.754728][T52604] se: weight(1048576) vruntime(371039526) slice(2800000) deadline(373834158) curr?(1) task?(0)
[ 3620.766182][T52604] se: weight(1048576) vruntime(371039175) slice(2800000) deadline(373836601) curr?(1) task?(0)
[ 3620.777633][T52604] se: weight(1048576) vruntime(371041584) slice(2800000) deadline(373839471) curr?(1) task?(0)
[ 3620.789087][T52604] se: weight(1048576) vruntime(371042368) slice(2800000) deadline(373839774) curr?(1) task?(0)
[ 3620.800540][T52604] se: weight(1048576) vruntime(372223233) slice(2800000) deadline(373839798) curr?(1) task?(0)
[ 3620.811995][T52604] se: weight(1048576) vruntime(372179775) slice(2800000) deadline(373841918) curr?(1) task?(0)
[ 3620.823451][T52604] se: weight(1048576) vruntime(371044163) slice(2800000) deadline(373842191) curr?(1) task?(0)
[ 3620.834899][T52604] se: weight(1048576) vruntime(371044711) slice(2800000) deadline(373842878) curr?(1) task?(0)
[ 3620.846353][T52604] se: weight(1048576) vruntime(371045850) slice(2800000) deadline(373843486) curr?(1) task?(0)
[ 3620.857807][T52604] se: weight(1048576) vruntime(371049649) slice(2800000) deadline(373845513) curr?(1) task?(0)
[ 3620.869259][T52604] se: weight(1048576) vruntime(372282218) slice(2800000) deadline(373846896) curr?(1) task?(0)
[ 3620.880712][T52604] se: weight(1048576) vruntime(371054889) slice(2800000) deadline(373851814) curr?(1) task?(0)
[ 3620.892169][T52604] se: weight(1048576) vruntime(371055983) slice(2800000) deadline(373852628) curr?(1) task?(0)
[ 3620.903623][T52604] se: weight(1048576) vruntime(371055796) slice(2800000) deadline(373853522) curr?(1) task?(0)
[ 3620.915080][T52604] se: weight(1048576) vruntime(371059157) slice(2800000) deadline(373856944) curr?(1) task?(0)
[ 3620.926534][T52604] se: weight(1048576) vruntime(371062493) slice(2800000) deadline(373858307) curr?(1) task?(0)
[ 3620.937979][T52604] se: weight(1048576) vruntime(371061297) slice(2800000) deadline(373858593) curr?(1) task?(0)
[ 3620.949431][T52604] se: weight(1048576) vruntime(372227534) slice(2800000) deadline(373860944) curr?(1) task?(0)
[ 3620.960884][T52604] se: weight(1048576) vruntime(371064327) slice(2800000) deadline(373861553) curr?(1) task?(0)
[ 3620.972339][T52604] se: weight(1048576) vruntime(371068680) slice(2800000) deadline(373862561) curr?(1) task?(0)
[ 3620.983793][T52604] se: weight(1048576) vruntime(372350717) slice(2800000) deadline(373862975) curr?(1) task?(0)
[ 3620.995251][T52604] se: weight(1048576) vruntime(372210581) slice(2800000) deadline(373864201) curr?(1) task?(0)
[ 3621.006706][T52604] se: weight(1048576) vruntime(371069448) slice(2800000) deadline(373867135) curr?(1) task?(0)
[ 3621.018161][T52604] se: weight(1048576) vruntime(372199129) slice(2800000) deadline(373867662) curr?(1) task?(0)
[ 3621.029611][T52604] se: weight(1048576) vruntime(372210583) slice(2800000) deadline(373869762) curr?(1) task?(0)
[ 3621.041063][T52604] se: weight(1048576) vruntime(372173321) slice(2800000) deadline(373870426) curr?(1) task?(0)
[ 3621.052515][T52604] se: weight(1048576) vruntime(371076345) slice(2800000) deadline(373872049) curr?(1) task?(0)
[ 3621.063970][T52604] se: weight(1048576) vruntime(371076179) slice(2800000) deadline(373872153) curr?(1) task?(0)
[ 3621.075426][T52604] se: weight(1048576) vruntime(371075876) slice(2800000) deadline(373873983) curr?(1) task?(0)
[ 3621.086882][T52604] se: weight(1048576) vruntime(372191684) slice(2800000) deadline(373880657) curr?(1) task?(0)
[ 3621.098335][T52604] se: weight(1048576) vruntime(371085624) slice(2800000) deadline(373880937) curr?(1) task?(0)
[ 3621.109790][T52604] se: weight(1048576) vruntime(371087860) slice(2800000) deadline(373881180) curr?(1) task?(0)
[ 3621.121240][T52604] se: weight(1048576) vruntime(371090613) slice(2800000) deadline(373885446) curr?(1) task?(0)
[ 3621.132693][T52604] se: weight(1048576) vruntime(372229600) slice(2800000) deadline(373887607) curr?(1) task?(0)
[ 3621.144148][T52604] se: weight(1048576) vruntime(371090183) slice(2800000) deadline(373887859) curr?(1) task?(0)
[ 3621.155603][T52604] se: weight(1048576) vruntime(372250986) slice(2800000) deadline(373889865) curr?(1) task?(0)
[ 3621.167061][T52604] se: weight(1048576) vruntime(371094367) slice(2800000) deadline(373890782) curr?(1) task?(0)
[ 3621.178516][T52604] se: weight(1048576) vruntime(371092582) slice(2800000) deadline(373890889) curr?(1) task?(0)
[ 3621.189972][T52604] se: weight(1048576) vruntime(372390457) slice(2800000) deadline(373892871) curr?(1) task?(0)
[ 3621.201421][T52604] se: weight(1048576) vruntime(372192864) slice(2800000) deadline(373893965) curr?(1) task?(0)
[ 3621.212875][T52604] se: weight(1048576) vruntime(371098935) slice(2800000) deadline(373894148) curr?(1) task?(0)
[ 3621.224320][T52604] se: weight(1048576) vruntime(371097802) slice(2800000) deadline(373896079) curr?(1) task?(0)
[ 3621.235773][T52604] se: weight(1048576) vruntime(372213677) slice(2800000) deadline(373897302) curr?(1) task?(0)
[ 3621.247232][T52604] se: weight(1048576) vruntime(371103092) slice(2800000) deadline(373897564) curr?(1) task?(0)
[ 3621.258689][T52604] se: weight(1048576) vruntime(371102930) slice(2800000) deadline(373898163) curr?(1) task?(0)
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[ 3621.625200][T52604] se: weight(1048576) vruntime(371165692) slice(2800000) deadline(373962938) curr?(1) task?(0)
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[ 3621.819909][T52604] se: weight(1048576) vruntime(371192203) slice(2800000) deadline(373990361) curr?(1) task?(0)
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[ 3623.011070][T52604] se: weight(1048576) vruntime(371340113) slice(2800000) deadline(374137449) curr?(1) task?(0)
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[ 3623.033979][T52604] se: weight(1048576) vruntime(372550020) slice(2800000) deadline(374139785) curr?(1) task?(0)
[ 3623.045433][T52604] se: weight(1048576) vruntime(371345075) slice(2800000) deadline(374140268) curr?(1) task?(0)
[ 3623.056885][T52604] se: weight(1048576) vruntime(371347041) slice(2800000) deadline(374140772) curr?(1) task?(0)
[ 3623.068338][T52604] se: weight(1048576) vruntime(371345931) slice(2800000) deadline(374140974) curr?(1) task?(0)
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[ 3623.091250][T52604] se: weight(1048576) vruntime(372484897) slice(2800000) deadline(374143605) curr?(1) task?(0)
[ 3623.102697][T52604] se: weight(1048576) vruntime(372518054) slice(2800000) deadline(374143944) curr?(1) task?(0)
[ 3623.114151][T52604] se: weight(1048576) vruntime(371352858) slice(2800000) deadline(374149092) curr?(1) task?(0)
[ 3623.125605][T52604] se: weight(1048576) vruntime(372668344) slice(2800000) deadline(374149346) curr?(1) task?(0)
[ 3623.137056][T52604] se: weight(1048576) vruntime(371354563) slice(2800000) deadline(374152129) curr?(1) task?(0)
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[ 3623.159966][T52604] se: weight(1048576) vruntime(371366268) slice(2800000) deadline(374160429) curr?(1) task?(0)
[ 3623.171421][T52604] se: weight(1048576) vruntime(372625443) slice(2800000) deadline(374160615) curr?(1) task?(0)
[ 3623.182877][T52604] se: weight(1048576) vruntime(372514266) slice(2800000) deadline(374164010) curr?(1) task?(0)
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[ 3623.205787][T52604] se: weight(1048576) vruntime(371371491) slice(2800000) deadline(374169839) curr?(1) task?(0)
[ 3623.217238][T52604] se: weight(1048576) vruntime(371373173) slice(2800000) deadline(374171100) curr?(1) task?(0)
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[ 3623.240146][T52604] se: weight(1048576) vruntime(372570928) slice(2800000) deadline(374176296) curr?(1) task?(0)
[ 3623.251600][T52604] se: weight(1048576) vruntime(371381727) slice(2800000) deadline(374178122) curr?(1) task?(0)
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[ 3623.274506][T52604] se: weight(1048576) vruntime(371386368) slice(2800000) deadline(374182512) curr?(1) task?(0)
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[ 3623.320316][T52604] se: weight(1048576) vruntime(371391483) slice(2800000) deadline(374185694) curr?(1) task?(0)
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[ 3623.354688][T52604] se: weight(1048576) vruntime(372620607) slice(2800000) deadline(374191143) curr?(1) task?(0)
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[ 3623.389035][T52604] se: weight(1048576) vruntime(372740334) slice(2800000) deadline(374197600) curr?(1) task?(0)
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[ 3623.411944][T52604] se: weight(1048576) vruntime(371401190) slice(2800000) deadline(374199117) curr?(1) task?(0)
[ 3623.423399][T52604] se: weight(1048576) vruntime(371407333) slice(2800000) deadline(374201945) curr?(1) task?(0)
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[ 3623.446311][T52604] se: weight(1048576) vruntime(371408712) slice(2800000) deadline(374204766) curr?(1) task?(0)
[ 3623.457757][T52604] se: weight(1048576) vruntime(371415829) slice(2800000) deadline(374212063) curr?(1) task?(0)
[ 3623.469208][T52604] se: weight(1048576) vruntime(372582111) slice(2800000) deadline(374212688) curr?(1) task?(0)
[ 3623.480662][T52604] se: weight(1048576) vruntime(372547501) slice(2800000) deadline(374212909) curr?(1) task?(0)
[ 3623.492116][T52604] se: weight(1048576) vruntime(371417375) slice(2800000) deadline(374214740) curr?(1) task?(0)
[ 3623.503569][T52604] se: weight(1048576) vruntime(371421565) slice(2800000) deadline(374217228) curr?(1) task?(0)
[ 3623.515026][T52604] se: weight(1048576) vruntime(371424912) slice(2800000) deadline(374219133) curr?(1) task?(0)
[ 3623.526482][T52604] se: weight(1048576) vruntime(372620608) slice(2800000) deadline(374219156) curr?(1) task?(0)
[ 3623.537934][T52604] se: weight(1048576) vruntime(371425619) slice(2800000) deadline(374221964) curr?(1) task?(0)
[ 3623.549386][T52604] se: weight(1048576) vruntime(372713486) slice(2800000) deadline(374225053) curr?(1) task?(0)
[ 3623.560839][T52604] se: weight(1048576) vruntime(371434965) slice(2800000) deadline(374231330) curr?(1) task?(0)
[ 3623.572292][T52604] se: weight(1048576) vruntime(372591104) slice(2800000) deadline(374231455) curr?(1) task?(0)
[ 3623.583748][T52604] se: weight(1048576) vruntime(372760206) slice(2800000) deadline(374231573) curr?(1) task?(0)
[ 3623.595204][T52604] se: weight(1048576) vruntime(371434914) slice(2800000) deadline(374232560) curr?(1) task?(0)
[ 3623.606661][T52604] se: weight(1048576) vruntime(371437927) slice(2800000) deadline(374233370) curr?(1) task?(0)
[ 3623.618115][T52604] se: weight(1048576) vruntime(371446094) slice(2800000) deadline(374243601) curr?(1) task?(0)
[ 3623.629570][T52604] se: weight(1048576) vruntime(371449564) slice(2800000) deadline(374244507) curr?(1) task?(0)
[ 3623.641021][T52604] se: weight(1048576) vruntime(371449941) slice(2800000) deadline(374244583) curr?(1) task?(0)
[ 3623.652475][T52604] se: weight(1048576) vruntime(371452685) slice(2800000) deadline(374247547) curr?(1) task?(0)
[ 3623.663931][T52604] se: weight(1048576) vruntime(371454765) slice(2800000) deadline(374253013) curr?(1) task?(0)
[ 3623.675385][T52604] se: weight(1048576) vruntime(371460207) slice(2800000) deadline(374257783) curr?(1) task?(0)
[ 3623.686842][T52604] se: weight(1048576) vruntime(371460632) slice(2800000) deadline(374258288) curr?(1) task?(0)
[ 3623.698297][T52604] se: weight(1048576) vruntime(371462906) slice(2800000) deadline(374260152) curr?(1) task?(0)
[ 3623.709752][T52604] se: weight(1048576) vruntime(371464018) slice(2800000) deadline(374261143) curr?(1) task?(0)
[ 3623.721203][T52604] se: weight(1048576) vruntime(371464759) slice(2800000) deadline(374262475) curr?(1) task?(0)
[ 3623.732657][T52604] se: weight(1048576) vruntime(371466777) slice(2800000) deadline(374262630) curr?(1) task?(0)
[ 3623.744112][T52604] se: weight(1048576) vruntime(371467188) slice(2800000) deadline(374263312) curr?(1) task?(0)
[ 3623.755568][T52604] se: weight(1048576) vruntime(372563769) slice(2800000) deadline(374264289) curr?(1) task?(0)
[ 3623.767025][T52604] se: weight(1048576) vruntime(371472492) slice(2800000) deadline(374266653) curr?(1) task?(0)
[ 3623.778480][T52604] se: weight(1048576) vruntime(372616690) slice(2800000) deadline(374266685) curr?(1) task?(0)
[ 3623.789934][T52604] se: weight(1048576) vruntime(371472732) slice(2800000) deadline(374267024) curr?(1) task?(0)
[ 3623.801387][T52604] se: weight(1048576) vruntime(371475780) slice(2800000) deadline(374270541) curr?(1) task?(0)
[ 3623.812841][T52604] se: weight(1048576) vruntime(371478752) slice(2800000) deadline(374273825) curr?(1) task?(0)
[ 3623.824293][T52604] se: weight(1048576) vruntime(371478242) slice(2800000) deadline(374274706) curr?(1) task?(0)
[ 3623.835749][T52604] se: weight(1048576) vruntime(371478736) slice(2800000) deadline(374274971) curr?(1) task?(0)
[ 3623.847205][T52604] se: weight(1048576) vruntime(372645889) slice(2800000) deadline(374275544) curr?(1) task?(0)
[ 3623.858661][T52604] se: weight(1048576) vruntime(371479763) slice(2800000) deadline(374275767) curr?(1) task?(0)
[ 3623.870114][T52604] se: weight(1048576) vruntime(372644444) slice(2800000) deadline(374277874) curr?(1) task?(0)
[ 3623.881560][T52604] se: weight(1048576) vruntime(372664050) slice(2800000) deadline(374278622) curr?(1) task?(0)
[ 3623.893011][T52604] se: weight(1048576) vruntime(371483120) slice(2800000) deadline(374278864) curr?(1) task?(0)
[ 3623.904464][T52604] se: weight(1048576) vruntime(371483305) slice(2800000) deadline(374279530) curr?(1) task?(0)
[ 3623.915921][T52604] se: weight(1048576) vruntime(371484103) slice(2800000) deadline(374279877) curr?(1) task?(0)
[ 3623.927376][T52604] se: weight(1048576) vruntime(371485211) slice(2800000) deadline(374280334) curr?(1) task?(0)
[ 3623.938833][T52604] se: weight(1048576) vruntime(371486826) slice(2800000) deadline(374280897) curr?(1) task?(0)
[ 3623.950286][T52604] se: weight(1048576) vruntime(372645891) slice(2800000) deadline(374281175) curr?(1) task?(0)
[ 3623.961741][T52604] se: weight(1048576) vruntime(371486746) slice(2800000) deadline(374281458) curr?(1) task?(0)
[ 3623.973191][T52604] se: weight(1048576) vruntime(371490551) slice(2800000) deadline(374286946) curr?(1) task?(0)
[ 3623.984645][T52604] se: weight(1048576) vruntime(371489419) slice(2800000) deadline(374287366) curr?(1) task?(0)
[ 3623.996099][T52604] se: weight(1048576) vruntime(371492180) slice(2800000) deadline(374287593) curr?(1) task?(0)
[ 3624.007553][T52604] se: weight(1048576) vruntime(371492225) slice(2800000) deadline(374287638) curr?(1) task?(0)
[ 3624.019011][T52604] se: weight(1048576) vruntime(371492330) slice(2800000) deadline(374288354) curr?(1) task?(0)
[ 3624.030468][T52604] se: weight(1048576) vruntime(371494333) slice(2800000) deadline(374289986) curr?(1) task?(0)
[ 3624.041920][T52604] se: weight(1048576) vruntime(371495933) slice(2800000) deadline(374293269) curr?(1) task?(0)
[ 3624.053374][T52604] se: weight(1048576) vruntime(371496485) slice(2800000) deadline(374293901) curr?(1) task?(0)
[ 3624.064828][T52604] se: weight(1048576) vruntime(371499100) slice(2800000) deadline(374295314) curr?(1) task?(0)
[ 3624.076280][T52604] se: weight(1048576) vruntime(371500473) slice(2800000) deadline(374295886) curr?(1) task?(0)
[ 3624.087736][T52604] se: weight(1048576) vruntime(371500424) slice(2800000) deadline(374296107) curr?(1) task?(0)
[ 3624.099193][T52604] se: weight(1048576) vruntime(372661437) slice(2800000) deadline(374299414) curr?(1) task?(0)
[ 3624.110649][T52604] se: weight(1048576) vruntime(371501912) slice(2800000) deadline(374299608) curr?(1) task?(0)
[ 3624.122101][T52604] se: weight(1048576) vruntime(371507428) slice(2800000) deadline(374300808) curr?(1) task?(0)
[ 3624.133556][T52604] se: weight(1048576) vruntime(371505049) slice(2800000) deadline(374301193) curr?(1) task?(0)
[ 3624.145007][T52604] se: weight(1048576) vruntime(371506433) slice(2800000) deadline(374302497) curr?(1) task?(0)
[ 3624.156460][T52604] se: weight(1048576) vruntime(371510120) slice(2800000) deadline(374304231) curr?(1) task?(0)
[ 3624.167915][T52604] se: weight(1048576) vruntime(372693008) slice(2800000) deadline(374304706) curr?(1) task?(0)
[ 3624.179368][T52604] se: weight(1048576) vruntime(371509266) slice(2800000) deadline(374305341) curr?(1) task?(0)
[ 3624.190824][T52604] se: weight(1048576) vruntime(371510134) slice(2800000) deadline(374305837) curr?(1) task?(0)
[ 3624.202279][T52604] se: weight(1048576) vruntime(371509701) slice(2800000) deadline(374306055) curr?(1) task?(0)
[ 3624.213735][T52604] se: weight(1048576) vruntime(371511633) slice(2800000) deadline(374306235) curr?(1) task?(0)
[ 3624.225185][T52604] se: weight(1048576) vruntime(371511057) slice(2800000) deadline(374306850) curr?(1) task?(0)
[ 3624.236638][T52604] se: weight(1048576) vruntime(371512746) slice(2800000) deadline(374307388) curr?(1) task?(0)
[ 3624.248093][T52604] se: weight(1048576) vruntime(371512439) slice(2800000) deadline(374309925) curr?(1) task?(0)
[ 3624.259546][T52604] se: weight(1048576) vruntime(371515074) slice(2800000) deadline(374310707) curr?(1) task?(0)
[ 3624.271005][T52604] se: weight(1048576) vruntime(372682129) slice(2800000) deadline(374312524) curr?(1) task?(0)
[ 3624.282452][T52604] se: weight(1048576) vruntime(371517144) slice(2800000) deadline(374313338) curr?(1) task?(0)
[ 3624.293906][T52604] se: weight(1048576) vruntime(371518247) slice(2800000) deadline(374314111) curr?(1) task?(0)
[ 3624.305359][T52604] se: weight(1048576) vruntime(371520462) slice(2800000) deadline(374316617) curr?(1) task?(0)
[ 3624.316812][T52604] se: weight(1048576) vruntime(371520895) slice(2800000) deadline(374317019) curr?(1) task?(0)
[ 3624.328264][T52604] se: weight(1048576) vruntime(371522217) slice(2800000) deadline(374319192) curr?(1) task?(0)
[ 3624.339720][T52604] se: weight(1048576) vruntime(371524542) slice(2800000) deadline(374320596) curr?(1) task?(0)
[ 3624.351176][T52604] se: weight(1048576) vruntime(371526683) slice(2800000) deadline(374323468) curr?(1) task?(0)
[ 3624.362631][T52604] se: weight(1048576) vruntime(371528244) slice(2800000) deadline(374324128) curr?(1) task?(0)
[ 3624.374084][T52604] se: weight(1048576) vruntime(372650770) slice(2800000) deadline(374324380) curr?(1) task?(0)
[ 3624.385538][T52604] se: weight(1048576) vruntime(372946143) slice(2800000) deadline(374325351) curr?(1) task?(0)
[ 3624.396989][T52604] se: weight(1048576) vruntime(371531420) slice(2800000) deadline(374327504) curr?(1) task?(0)
[ 3624.408443][T52604] se: weight(1048576) vruntime(372679692) slice(2800000) deadline(374327975) curr?(1) task?(0)
[ 3624.419899][T52604] se: weight(1048576) vruntime(371538452) slice(2800000) deadline(374332063) curr?(1) task?(0)
[ 3624.431354][T52604] se: weight(1048576) vruntime(371538639) slice(2800000) deadline(374336416) curr?(1) task?(0)
[ 3624.442811][T52604] se: weight(1048576) vruntime(372672554) slice(2800000) deadline(374338583) curr?(1) task?(0)
[ 3624.454264][T52604] se: weight(1048576) vruntime(372753243) slice(2800000) deadline(374339232) curr?(1) task?(0)
[ 3624.465719][T52604] se: weight(1048576) vruntime(371541966) slice(2800000) deadline(374340144) curr?(1) task?(0)
[ 3624.477170][T52604] se: weight(1048576) vruntime(371544195) slice(2800000) deadline(374342112) curr?(1) task?(0)
[ 3624.488623][T52604] se: weight(1048576) vruntime(371548274) slice(2800000) deadline(374344759) curr?(1) task?(0)
[ 3624.500068][T52604] se: weight(1048576) vruntime(371550159) slice(2800000) deadline(374346023) curr?(1) task?(0)
[ 3624.511521][T52604] se: weight(1048576) vruntime(372738159) slice(2800000) deadline(374346953) curr?(1) task?(0)
[ 3624.522978][T52604] se: weight(1048576) vruntime(372703297) slice(2800000) deadline(374349106) curr?(1) task?(0)
[ 3624.534433][T52604] se: weight(1048576) vruntime(371554521) slice(2800000) deadline(374351927) curr?(1) task?(0)
[ 3624.545886][T52604] se: weight(1048576) vruntime(372736319) slice(2800000) deadline(374353665) curr?(1) task?(0)
[ 3624.557338][T52604] se: weight(1048576) vruntime(371560539) slice(2800000) deadline(374356993) curr?(1) task?(0)
[ 3624.568791][T52604] se: weight(1048576) vruntime(371562436) slice(2800000) deadline(374357219) curr?(1) task?(0)
[ 3624.580243][T52604] se: weight(1048576) vruntime(372744263) slice(2800000) deadline(374357863) curr?(1) task?(0)
[ 3624.591699][T52604] se: weight(1048576) vruntime(372695518) slice(2800000) deadline(374358182) curr?(1) task?(0)
[ 3624.603156][T52604] se: weight(1048576) vruntime(371561702) slice(2800000) deadline(374359819) curr?(1) task?(0)
[ 3624.614604][T52604] se: weight(1048576) vruntime(371564952) slice(2800000) deadline(374361206) curr?(1) task?(0)
[ 3624.626057][T52604] se: weight(1048576) vruntime(371569152) slice(2800000) deadline(374363773) curr?(1) task?(0)
[ 3624.637511][T52604] se: weight(1048576) vruntime(371567687) slice(2800000) deadline(374364062) curr?(1) task?(0)
[ 3624.648961][T52604] se: weight(1048576) vruntime(371572134) slice(2800000) deadline(374367046) curr?(1) task?(0)
[ 3624.660414][T52604] se: weight(1048576) vruntime(372762312) slice(2800000) deadline(374367560) curr?(1) task?(0)
[ 3624.671870][T52604] se: weight(1048576) vruntime(371575676) slice(2800000) deadline(374370357) curr?(1) task?(0)
[ 3624.683325][T52604] se: weight(1048576) vruntime(371585041) slice(2800000) deadline(374370920) curr?(1) task?(0)
[ 3624.694781][T52604] se: weight(1048576) vruntime(372762314) slice(2800000) deadline(374376495) curr?(1) task?(0)
[ 3624.706235][T52604] se: weight(1048576) vruntime(372810217) slice(2800000) deadline(374377628) curr?(1) task?(0)
[ 3624.717690][T52604] se: weight(1048576) vruntime(372954243) slice(2800000) deadline(374377939) curr?(1) task?(0)
[ 3624.729139][T52604] se: weight(1048576) vruntime(372757820) slice(2800000) deadline(374378500) curr?(1) task?(0)
[ 3624.740593][T52604] se: weight(1048576) vruntime(372717679) slice(2800000) deadline(374379021) curr?(1) task?(0)
[ 3624.752049][T52604] se: weight(1048576) vruntime(371585571) slice(2800000) deadline(374381305) curr?(1) task?(0)
[ 3624.763502][T52604] se: weight(1048576) vruntime(371586888) slice(2800000) deadline(374385065) curr?(1) task?(0)
[ 3624.774959][T52604] se: weight(1048576) vruntime(372780797) slice(2800000) deadline(374386656) curr?(1) task?(0)
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[ 3626.538810][T52604] se: weight(1048576) vruntime(371815128) slice(2800000) deadline(374610531) curr?(1) task?(0)
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[ 3627.317667][T52604] se: weight(1048576) vruntime(371956024) slice(2800000) deadline(374752259) curr?(1) task?(0)
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[ 3633.594341][T52604] se: weight(1048576) vruntime(373191603) slice(2800000) deadline(375986675) curr?(1) task?(0)
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[ 3634.063934][T52604] se: weight(1048576) vruntime(373321543) slice(2800000) deadline(376115804) curr?(1) task?(0)
[ 3634.075387][T52604] se: weight(1048576) vruntime(373327570) slice(2800000) deadline(376122723) curr?(1) task?(0)
[ 3634.086843][T52604] se: weight(1048576) vruntime(373335436) slice(2800000) deadline(376128726) curr?(1) task?(0)
[ 3634.098299][T52604] se: weight(1048576) vruntime(373335154) slice(2800000) deadline(376130648) curr?(1) task?(0)
[ 3634.109756][T52604] se: weight(1048576) vruntime(373336347) slice(2800000) deadline(376131800) curr?(1) task?(0)
[ 3634.121209][T52604] se: weight(1048576) vruntime(373339084) slice(2800000) deadline(376133595) curr?(1) task?(0)
[ 3634.132665][T52604] se: weight(1048576) vruntime(373342062) slice(2800000) deadline(376135643) curr?(1) task?(0)
[ 3634.144117][T52604] se: weight(1048576) vruntime(373343564) slice(2800000) deadline(376138096) curr?(1) task?(0)
[ 3634.155569][T52604] se: weight(1048576) vruntime(373347512) slice(2800000) deadline(376142034) curr?(1) task?(0)
[ 3634.167017][T52604] se: weight(1048576) vruntime(373347325) slice(2800000) deadline(376142367) curr?(1) task?(0)
[ 3634.178472][T52604] se: weight(1048576) vruntime(373350306) slice(2800000) deadline(376142935) curr?(1) task?(0)
[ 3634.189929][T52604] se: weight(1048576) vruntime(373356125) slice(2800000) deadline(376151267) curr?(1) task?(0)
[ 3634.201382][T52604] se: weight(1048576) vruntime(373367312) slice(2800000) deadline(376161554) curr?(1) task?(0)
[ 3634.212835][T52604] se: weight(1048576) vruntime(373366800) slice(2800000) deadline(376161803) curr?(1) task?(0)
[ 3634.224286][T52604] se: weight(1048576) vruntime(373368889) slice(2800000) deadline(376163981) curr?(1) task?(0)
[ 3634.235740][T52604] se: weight(1048576) vruntime(373370285) slice(2800000) deadline(376164947) curr?(1) task?(0)
[ 3634.247195][T52604] se: weight(1048576) vruntime(373366574) slice(2800000) deadline(376166574) curr?(1) task?(0)
[ 3634.258650][T52604] se: weight(1048576) vruntime(373372811) slice(2800000) deadline(376166873) curr?(1) task?(0)
[ 3634.270109][T52604] se: weight(1048576) vruntime(373374226) slice(2800000) deadline(376167315) curr?(1) task?(0)
[ 3634.281565][T52604] se: weight(1048576) vruntime(373376897) slice(2800000) deadline(376170136) curr?(1) task?(0)
[ 3634.293021][T52604] se: weight(1048576) vruntime(373374570) slice(2800000) deadline(376174570) curr?(1) task?(0)
[ 3634.304472][T52604] se: weight(1048576) vruntime(373385787) slice(2800000) deadline(376179807) curr?(1) task?(0)
[ 3634.315923][T52604] se: weight(1048576) vruntime(373385482) slice(2800000) deadline(376180024) curr?(1) task?(0)
[ 3634.327376][T52604] se: weight(1048576) vruntime(373384947) slice(2800000) deadline(376180160) curr?(1) task?(0)
[ 3634.338833][T52604] se: weight(1048576) vruntime(373386862) slice(2800000) deadline(376181454) curr?(1) task?(0)
[ 3634.350290][T52604] se: weight(1048576) vruntime(373387582) slice(2800000) deadline(376183556) curr?(1) task?(0)
[ 3634.361745][T52604] se: weight(1048576) vruntime(373391027) slice(2800000) deadline(376185288) curr?(1) task?(0)
[ 3634.373197][T52604] se: weight(1048576) vruntime(373395326) slice(2800000) deadline(376189718) curr?(1) task?(0)
[ 3634.384651][T52604] se: weight(1048576) vruntime(373395828) slice(2800000) deadline(376191081) curr?(1) task?(0)
[ 3634.396102][T52604] se: weight(1048576) vruntime(373397832) slice(2800000) deadline(376192213) curr?(1) task?(0)
[ 3634.407556][T52604] se: weight(1048576) vruntime(373398171) slice(2800000) deadline(376192503) curr?(1) task?(0)
[ 3634.419011][T52604] se: weight(1048576) vruntime(373397815) slice(2800000) deadline(376192697) curr?(1) task?(0)
[ 3634.430466][T52604] se: weight(1048576) vruntime(373393167) slice(2800000) deadline(376193167) curr?(1) task?(0)
[ 3634.441923][T52604] se: weight(1048576) vruntime(373400695) slice(2800000) deadline(376195728) curr?(1) task?(0)
[ 3634.453378][T52604] se: weight(1048576) vruntime(373403307) slice(2800000) deadline(376203307) curr?(1) task?(0)
[ 3634.464832][T52604] se: weight(1048576) vruntime(373409574) slice(2800000) deadline(376209574) curr?(1) task?(0)
[ 3634.476282][T52604] se: weight(1048576) vruntime(373414355) slice(2800000) deadline(376209938) curr?(1) task?(0)
[ 3634.487735][T52604] se: weight(1048576) vruntime(373415505) slice(2800000) deadline(376210778) curr?(1) task?(0)
[ 3634.499182][T52604] se: weight(1048576) vruntime(373419794) slice(2800000) deadline(376214326) curr?(1) task?(0)
[ 3634.510636][T52604] se: weight(1048576) vruntime(373420876) slice(2800000) deadline(376215628) curr?(1) task?(0)
[ 3634.522092][T52604] se: weight(1048576) vruntime(373422271) slice(2800000) deadline(376217083) curr?(1) task?(0)
[ 3634.533549][T52604] se: weight(1048576) vruntime(373420918) slice(2800000) deadline(376217723) curr?(1) task?(0)
[ 3634.545003][T52604] se: weight(1048576) vruntime(373428394) slice(2800000) deadline(376222015) curr?(1) task?(0)
[ 3634.556453][T52604] se: weight(1048576) vruntime(373424423) slice(2800000) deadline(376224423) curr?(1) task?(0)
[ 3634.567907][T52604] se: weight(1048576) vruntime(373425802) slice(2800000) deadline(376225802) curr?(1) task?(0)
[ 3634.579361][T52604] se: weight(1048576) vruntime(373427062) slice(2800000) deadline(376227062) curr?(1) task?(0)
[ 3634.590815][T52604] se: weight(1048576) vruntime(373433239) slice(2800000) deadline(376227440) curr?(1) task?(0)
[ 3634.602272][T52604] se: weight(1048576) vruntime(373428846) slice(2800000) deadline(376228846) curr?(1) task?(0)
[ 3634.613726][T52604] se: weight(1048576) vruntime(373436570) slice(2800000) deadline(376231823) curr?(1) task?(0)
[ 3634.625179][T52604] se: weight(1048576) vruntime(373434230) slice(2800000) deadline(376234230) curr?(1) task?(0)
[ 3634.636637][T52604] se: weight(1048576) vruntime(373440547) slice(2800000) deadline(376235860) curr?(1) task?(0)
[ 3634.648089][T52604] se: weight(1048576) vruntime(373441880) slice(2800000) deadline(376236042) curr?(1) task?(0)
[ 3634.659542][T52604] se: weight(1048576) vruntime(373441708) slice(2800000) deadline(376236620) curr?(1) task?(0)
[ 3634.670990][T52604] se: weight(1048576) vruntime(373455822) slice(2800000) deadline(376247369) curr?(1) task?(0)
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[ 3634.693901][T52604] se: weight(1048576) vruntime(373454804) slice(2800000) deadline(376248845) curr?(1) task?(0)
[ 3634.705355][T52604] se: weight(1048576) vruntime(373449518) slice(2800000) deadline(376249518) curr?(1) task?(0)
[ 3634.716799][T52604] se: weight(1048576) vruntime(373451958) slice(2800000) deadline(376251958) curr?(1) task?(0)
[ 3634.728250][T52604] se: weight(1048576) vruntime(373461287) slice(2800000) deadline(376254517) curr?(1) task?(0)
[ 3634.739703][T52604] se: weight(1048576) vruntime(373462645) slice(2800000) deadline(376256746) curr?(1) task?(0)
[ 3634.751148][T52604] se: weight(1048576) vruntime(373466832) slice(2800000) deadline(376261624) curr?(1) task?(0)
[ 3634.762602][T52604] se: weight(1048576) vruntime(373468734) slice(2800000) deadline(376262113) curr?(1) task?(0)
[ 3634.774060][T52604] se: weight(1048576) vruntime(373467209) slice(2800000) deadline(376262692) curr?(1) task?(0)
[ 3634.785517][T52604] se: weight(1048576) vruntime(373468258) slice(2800000) deadline(376263861) curr?(1) task?(0)
[ 3634.796971][T52604] se: weight(1048576) vruntime(373473251) slice(2800000) deadline(376268394) curr?(1) task?(0)
[ 3634.808423][T52604] se: weight(1048576) vruntime(373474392) slice(2800000) deadline(376268443) curr?(1) task?(0)
[ 3634.819875][T52604] se: weight(1048576) vruntime(373472218) slice(2800000) deadline(376268844) curr?(1) task?(0)
[ 3634.831328][T52604] se: weight(1048576) vruntime(373477724) slice(2800000) deadline(376272316) curr?(1) task?(0)
[ 3634.842784][T52604] se: weight(1048576) vruntime(373478063) slice(2800000) deadline(376272715) curr?(1) task?(0)
[ 3634.854241][T52604] se: weight(1048576) vruntime(373478188) slice(2800000) deadline(376272951) curr?(1) task?(0)
[ 3634.865697][T52604] se: weight(1048576) vruntime(373479512) slice(2800000) deadline(376275415) curr?(1) task?(0)
[ 3634.877151][T52604] se: weight(1048576) vruntime(373481267) slice(2800000) deadline(376275919) curr?(1) task?(0)
[ 3634.888606][T52604] se: weight(1048576) vruntime(373481413) slice(2800000) deadline(376276666) curr?(1) task?(0)
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[ 3634.911511][T52604] se: weight(1048576) vruntime(373483168) slice(2800000) deadline(376283168) curr?(1) task?(0)
[ 3634.922967][T52604] se: weight(1048576) vruntime(373490808) slice(2800000) deadline(376285680) curr?(1) task?(0)
[ 3634.934423][T52604] se: weight(1048576) vruntime(373485901) slice(2800000) deadline(376285901) curr?(1) task?(0)
[ 3634.945879][T52604] se: weight(1048576) vruntime(373497532) slice(2800000) deadline(376291042) curr?(1) task?(0)
[ 3634.957332][T52604] se: weight(1048576) vruntime(373499689) slice(2800000) deadline(376291827) curr?(1) task?(0)
[ 3634.968786][T52604] se: weight(1048576) vruntime(373506345) slice(2800000) deadline(376301558) curr?(1) task?(0)
[ 3634.980237][T52604] se: weight(1048576) vruntime(373503457) slice(2800000) deadline(376303457) curr?(1) task?(0)
[ 3634.991691][T52604] se: weight(1048576) vruntime(373508677) slice(2800000) deadline(376303819) curr?(1) task?(0)
[ 3635.003145][T52604] se: weight(1048576) vruntime(373511300) slice(2800000) deadline(376306262) curr?(1) task?(0)
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[ 3635.026055][T52604] se: weight(1048576) vruntime(373508279) slice(2800000) deadline(376308279) curr?(1) task?(0)
[ 3635.037511][T52604] se: weight(1048576) vruntime(373518492) slice(2800000) deadline(376313805) curr?(1) task?(0)
[ 3635.048967][T52604] se: weight(1048576) vruntime(373520333) slice(2800000) deadline(376314313) curr?(1) task?(0)
[ 3635.060418][T52604] se: weight(1048576) vruntime(373523752) slice(2800000) deadline(376319085) curr?(1) task?(0)
[ 3635.071870][T52604] se: weight(1048576) vruntime(373524558) slice(2800000) deadline(376320072) curr?(1) task?(0)
[ 3635.083323][T52604] se: weight(1048576) vruntime(373528686) slice(2800000) deadline(376324409) curr?(1) task?(0)
[ 3635.094778][T52604] se: weight(1048576) vruntime(373531276) slice(2800000) deadline(376326739) curr?(1) task?(0)
[ 3635.106235][T52604] se: weight(1048576) vruntime(373532102) slice(2800000) deadline(376332102) curr?(1) task?(0)
[ 3635.117691][T52604] se: weight(1048576) vruntime(373537158) slice(2800000) deadline(376337158) curr?(1) task?(0)
[ 3635.129145][T52604] se: weight(1048576) vruntime(373541247) slice(2800000) deadline(376341247) curr?(1) task?(0)
[ 3635.140599][T52604] se: weight(1048576) vruntime(373542681) slice(2800000) deadline(376342681) curr?(1) task?(0)
[ 3635.152050][T52604] se: weight(1048576) vruntime(373555022) slice(2800000) deadline(376350234) curr?(1) task?(0)
[ 3635.163503][T52604] se: weight(1048576) vruntime(373559386) slice(2800000) deadline(376354989) curr?(1) task?(0)
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[ 3635.186416][T52604] se: weight(1048576) vruntime(373570160) slice(2800000) deadline(376363520) curr?(1) task?(0)
[ 3635.197873][T52604] se: weight(1048576) vruntime(373568969) slice(2800000) deadline(376364011) curr?(1) task?(0)
[ 3635.209327][T52604] se: weight(1048576) vruntime(373568664) slice(2800000) deadline(376364418) curr?(1) task?(0)
[ 3635.220781][T52604] se: weight(1048576) vruntime(373573407) slice(2800000) deadline(376368800) curr?(1) task?(0)
[ 3635.232232][T52604] se: weight(1048576) vruntime(373576050) slice(2800000) deadline(376370031) curr?(1) task?(0)
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[ 3635.255140][T52604] se: weight(1048576) vruntime(373581909) slice(2800000) deadline(376376281) curr?(1) task?(0)
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[ 3635.289507][T52604] se: weight(1048576) vruntime(373594969) slice(2800000) deadline(376389320) curr?(1) task?(0)
[ 3635.300952][T52604] se: weight(1048576) vruntime(373589942) slice(2800000) deadline(376389942) curr?(1) task?(0)
[ 3635.312403][T52604] se: weight(1048576) vruntime(373595942) slice(2800000) deadline(376390434) curr?(1) task?(0)
[ 3635.323856][T52604] se: weight(1048576) vruntime(373594769) slice(2800000) deadline(376394769) curr?(1) task?(0)
[ 3635.335310][T52604] se: weight(1048576) vruntime(373605113) slice(2800000) deadline(376399074) curr?(1) task?(0)
[ 3635.346766][T52604] se: weight(1048576) vruntime(373608885) slice(2800000) deadline(376404679) curr?(1) task?(0)
[ 3635.358214][T52604] se: weight(1048576) vruntime(373617045) slice(2800000) deadline(376411506) curr?(1) task?(0)
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[ 3637.110622][T52604] se: weight(1048576) vruntime(373969816) slice(2800000) deadline(376765280) curr?(1) task?(0)
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[ 3637.270978][T52604] se: weight(1048576) vruntime(374011991) slice(2800000) deadline(376807364) curr?(1) task?(0)
[ 3637.282431][T52604] se: weight(1048576) vruntime(374014733) slice(2800000) deadline(376808624) curr?(1) task?(0)
[ 3637.293890][T52604] se: weight(1048576) vruntime(374014734) slice(2800000) deadline(376809787) curr?(1) task?(0)
[ 3637.305346][T52604] se: weight(1048576) vruntime(374017037) slice(2800000) deadline(376810987) curr?(1) task?(0)
[ 3637.316801][T52604] se: weight(1048576) vruntime(374021493) slice(2800000) deadline(376814152) curr?(1) task?(0)
[ 3637.328253][T52604] se: weight(1048576) vruntime(374022004) slice(2800000) deadline(376815314) curr?(1) task?(0)
[ 3637.339706][T52604] se: weight(1048576) vruntime(374023979) slice(2800000) deadline(376819102) curr?(1) task?(0)
[ 3637.351160][T52604] se: weight(1048576) vruntime(374024679) slice(2800000) deadline(376819822) curr?(1) task?(0)
[ 3637.362617][T52604] se: weight(1048576) vruntime(374025366) slice(2800000) deadline(376820829) curr?(1) task?(0)
[ 3637.374074][T52604] se: weight(1048576) vruntime(374026548) slice(2800000) deadline(376822552) curr?(1) task?(0)
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[ 3637.396983][T52604] se: weight(1048576) vruntime(374034411) slice(2800000) deadline(376827281) curr?(1) task?(0)
[ 3637.408428][T52604] se: weight(1048576) vruntime(374029312) slice(2800000) deadline(376829312) curr?(1) task?(0)
[ 3637.419878][T52604] se: weight(1048576) vruntime(374030737) slice(2800000) deadline(376830737) curr?(1) task?(0)
[ 3637.431331][T52604] se: weight(1048576) vruntime(374033836) slice(2800000) deadline(376833836) curr?(1) task?(0)
[ 3637.442787][T52604] se: weight(1048576) vruntime(374038828) slice(2800000) deadline(376834130) curr?(1) task?(0)
[ 3637.454242][T52604] se: weight(1048576) vruntime(374042241) slice(2800000) deadline(376835240) curr?(1) task?(0)
[ 3637.465698][T52604] se: weight(1048576) vruntime(374038771) slice(2800000) deadline(376836177) curr?(1) task?(0)
[ 3637.477152][T52604] se: weight(1048576) vruntime(374047890) slice(2800000) deadline(376841140) curr?(1) task?(0)
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[ 3637.500056][T52604] se: weight(1048576) vruntime(374042764) slice(2800000) deadline(376842764) curr?(1) task?(0)
[ 3637.511511][T52604] se: weight(1048576) vruntime(374047885) slice(2800000) deadline(376843097) curr?(1) task?(0)
[ 3637.522966][T52604] se: weight(1048576) vruntime(374048008) slice(2800000) deadline(376843391) curr?(1) task?(0)
[ 3637.534420][T52604] se: weight(1048576) vruntime(374051556) slice(2800000) deadline(376846488) curr?(1) task?(0)
[ 3637.545878][T52604] se: weight(1048576) vruntime(374048911) slice(2800000) deadline(376848911) curr?(1) task?(0)
[ 3637.557334][T52604] se: weight(1048576) vruntime(374061207) slice(2800000) deadline(376861207) curr?(1) task?(0)
[ 3637.568788][T52604] se: weight(1048576) vruntime(374068289) slice(2800000) deadline(376861879) curr?(1) task?(0)
[ 3637.580239][T52604] se: weight(1048576) vruntime(374066788) slice(2800000) deadline(376866788) curr?(1) task?(0)
[ 3637.591692][T52604] se: weight(1048576) vruntime(374077927) slice(2800000) deadline(376873240) curr?(1) task?(0)
[ 3637.603146][T52604] se: weight(1048576) vruntime(374094432) slice(2800000) deadline(376887071) curr?(1) task?(0)
[ 3637.614602][T52604] se: weight(1048576) vruntime(374092372) slice(2800000) deadline(376887124) curr?(1) task?(0)
[ 3637.626057][T52604] se: weight(1048576) vruntime(374098393) slice(2800000) deadline(376892154) curr?(1) task?(0)
[ 3637.637512][T52604] se: weight(1048576) vruntime(374100128) slice(2800000) deadline(376894850) curr?(1) task?(0)
[ 3637.648966][T52604] se: weight(1048576) vruntime(374095484) slice(2800000) deadline(376895484) curr?(1) task?(0)
[ 3637.660420][T52604] se: weight(1048576) vruntime(374104032) slice(2800000) deadline(376899355) curr?(1) task?(0)
[ 3637.671871][T52604] se: weight(1048576) vruntime(374101130) slice(2800000) deadline(376901130) curr?(1) task?(0)
[ 3637.683324][T52604] se: weight(1048576) vruntime(374108496) slice(2800000) deadline(376903719) curr?(1) task?(0)
[ 3637.694780][T52604] se: weight(1048576) vruntime(374116618) slice(2800000) deadline(376907755) curr?(1) task?(0)
[ 3637.706236][T52604] se: weight(1048576) vruntime(374114640) slice(2800000) deadline(376908280) curr?(1) task?(0)
[ 3637.717691][T52604] se: weight(1048576) vruntime(374111092) slice(2800000) deadline(376911092) curr?(1) task?(0)
[ 3637.729146][T52604] se: weight(1048576) vruntime(374115634) slice(2800000) deadline(376911347) curr?(1) task?(0)
[ 3637.740602][T52604] se: weight(1048576) vruntime(374119611) slice(2800000) deadline(376913101) curr?(1) task?(0)
[ 3637.752052][T52604] se: weight(1048576) vruntime(374121470) slice(2800000) deadline(376916682) curr?(1) task?(0)
[ 3637.763506][T52604] se: weight(1048576) vruntime(374123049) slice(2800000) deadline(376923049) curr?(1) task?(0)
[ 3637.774961][T52604] se: weight(1048576) vruntime(374131230) slice(2800000) deadline(376923849) curr?(1) task?(0)
[ 3637.786415][T52604] se: weight(1048576) vruntime(374132176) slice(2800000) deadline(376927249) curr?(1) task?(0)
[ 3637.797872][T52604] se: weight(1048576) vruntime(374133006) slice(2800000) deadline(376927668) curr?(1) task?(0)
[ 3637.809329][T52604] se: weight(1048576) vruntime(374134020) slice(2800000) deadline(376928411) curr?(1) task?(0)
[ 3637.820774][T52604] se: weight(1048576) vruntime(374135353) slice(2800000) deadline(376928493) curr?(1) task?(0)
[ 3637.832225][T52604] se: weight(1048576) vruntime(374140141) slice(2800000) deadline(376940141) curr?(1) task?(0)
[ 3637.843679][T52604] se: weight(1048576) vruntime(374153145) slice(2800000) deadline(376947908) curr?(1) task?(0)
[ 3637.855131][T52604] se: weight(1048576) vruntime(374149382) slice(2800000) deadline(376949382) curr?(1) task?(0)
[ 3637.866588][T52604] se: weight(1048576) vruntime(374157840) slice(2800000) deadline(376950789) curr?(1) task?(0)
[ 3637.878035][T52604] se: weight(1048576) vruntime(374157433) slice(2800000) deadline(376952365) curr?(1) task?(0)
[ 3637.889490][T52604] se: weight(1048576) vruntime(374161887) slice(2800000) deadline(376956118) curr?(1) task?(0)
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[ 3637.912390][T52604] se: weight(1048576) vruntime(374161232) slice(2800000) deadline(376956615) curr?(1) task?(0)
[ 3637.923839][T52604] se: weight(1048576) vruntime(374175183) slice(2800000) deadline(376969384) curr?(1) task?(0)
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[ 3637.946748][T52604] se: weight(1048576) vruntime(374181463) slice(2800000) deadline(376975684) curr?(1) task?(0)
[ 3637.958202][T52604] se: weight(1048576) vruntime(374186228) slice(2800000) deadline(376976663) curr?(1) task?(0)
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[ 3637.992569][T52604] se: weight(1048576) vruntime(374187679) slice(2800000) deadline(376982972) curr?(1) task?(0)
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[ 3638.026929][T52604] se: weight(1048576) vruntime(374185941) slice(2800000) deadline(376985941) curr?(1) task?(0)
[ 3638.038382][T52604] se: weight(1048576) vruntime(374191275) slice(2800000) deadline(376986267) curr?(1) task?(0)
[ 3638.049840][T52604] se: weight(1048576) vruntime(374187448) slice(2800000) deadline(376987448) curr?(1) task?(0)
[ 3638.061296][T52604] se: weight(1048576) vruntime(374192105) slice(2800000) deadline(376987458) curr?(1) task?(0)
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[ 3638.084202][T52604] se: weight(1048576) vruntime(374197834) slice(2800000) deadline(376993056) curr?(1) task?(0)
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[ 3638.107108][T52604] se: weight(1048576) vruntime(374202116) slice(2800000) deadline(376997409) curr?(1) task?(0)
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[ 3638.152931][T52604] se: weight(1048576) vruntime(374204433) slice(2800000) deadline(376999786) curr?(1) task?(0)
[ 3638.164386][T52604] se: weight(1048576) vruntime(374204702) slice(2800000) deadline(377000055) curr?(1) task?(0)
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[ 3638.187291][T52604] se: weight(1048576) vruntime(374208770) slice(2800000) deadline(377004384) curr?(1) task?(0)
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[ 3638.233113][T52604] se: weight(1048576) vruntime(374210663) slice(2800000) deadline(377010663) curr?(1) task?(0)
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[ 3638.256017][T52604] se: weight(1048576) vruntime(374221163) slice(2800000) deadline(377014102) curr?(1) task?(0)
[ 3638.267471][T52604] se: weight(1048576) vruntime(374219721) slice(2800000) deadline(377014974) curr?(1) task?(0)
[ 3638.278925][T52604] se: weight(1048576) vruntime(374220595) slice(2800000) deadline(377015588) curr?(1) task?(0)
[ 3638.290379][T52604] se: weight(1048576) vruntime(374220778) slice(2800000) deadline(377016171) curr?(1) task?(0)
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[ 3638.336197][T52604] se: weight(1048576) vruntime(374226460) slice(2800000) deadline(377021793) curr?(1) task?(0)
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[ 3638.359104][T52604] se: weight(1048576) vruntime(374230223) slice(2800000) deadline(377024565) curr?(1) task?(0)
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[ 3638.382008][T52604] se: weight(1048576) vruntime(374230460) slice(2800000) deadline(377025233) curr?(1) task?(0)
[ 3638.393462][T52604] se: weight(1048576) vruntime(374230479) slice(2800000) deadline(377025592) curr?(1) task?(0)
[ 3638.404915][T52604] se: weight(1048576) vruntime(374232249) slice(2800000) deadline(377027161) curr?(1) task?(0)
[ 3638.416361][T52604] se: weight(1048576) vruntime(374233127) slice(2800000) deadline(377027178) curr?(1) task?(0)
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[ 3638.439266][T52604] se: weight(1048576) vruntime(374228748) slice(2800000) deadline(377028748) curr?(1) task?(0)
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[ 3638.519434][T52604] se: weight(1048576) vruntime(374246209) slice(2800000) deadline(377041011) curr?(1) task?(0)
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[ 3638.817219][T52604] se: weight(1048576) vruntime(374292763) slice(2800000) deadline(377088055) curr?(1) task?(0)
[ 3638.828672][T52604] se: weight(1048576) vruntime(374294138) slice(2800000) deadline(377090893) curr?(1) task?(0)
[ 3638.840125][T52604] se: weight(1048576) vruntime(374298472) slice(2800000) deadline(377091071) curr?(1) task?(0)
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[ 3638.874486][T52604] se: weight(1048576) vruntime(374302565) slice(2800000) deadline(377097868) curr?(1) task?(0)
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[ 3639.011933][T52604] se: weight(1048576) vruntime(374337876) slice(2800000) deadline(377131476) curr?(1) task?(0)
[ 3639.023387][T52604] se: weight(1048576) vruntime(374341305) slice(2800000) deadline(377141305) curr?(1) task?(0)
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[ 3639.046296][T52604] se: weight(1048576) vruntime(374358421) slice(2800000) deadline(377154345) curr?(1) task?(0)
[ 3639.057756][T52604] se: weight(1048576) vruntime(374361565) slice(2800000) deadline(377156277) curr?(1) task?(0)
[ 3639.069202][T52604] se: weight(1048576) vruntime(374366003) slice(2800000) deadline(377158261) curr?(1) task?(0)
[ 3639.080656][T52604] se: weight(1048576) vruntime(374364658) slice(2800000) deadline(377158769) curr?(1) task?(0)
[ 3639.092109][T52604] se: weight(1048576) vruntime(374364444) slice(2800000) deadline(377159346) curr?(1) task?(0)
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[ 3639.160827][T52604] se: weight(1048576) vruntime(374376184) slice(2800000) deadline(377176184) curr?(1) task?(0)
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[ 3639.183733][T52604] se: weight(1048576) vruntime(374383129) slice(2800000) deadline(377178462) curr?(1) task?(0)
[ 3639.195188][T52604] se: weight(1048576) vruntime(374385987) slice(2800000) deadline(377180099) curr?(1) task?(0)
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[ 3639.229554][T52604] se: weight(1048576) vruntime(374390932) slice(2800000) deadline(377186185) curr?(1) task?(0)
[ 3639.241008][T52604] se: weight(1048576) vruntime(374394713) slice(2800000) deadline(377186500) curr?(1) task?(0)
[ 3639.252464][T52604] se: weight(1048576) vruntime(374394242) slice(2800000) deadline(377189045) curr?(1) task?(0)
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[ 3639.275370][T52604] se: weight(1048576) vruntime(374396229) slice(2800000) deadline(377191672) curr?(1) task?(0)
[ 3639.286825][T52604] se: weight(1048576) vruntime(374396682) slice(2800000) deadline(377191945) curr?(1) task?(0)
[ 3639.298278][T52604] se: weight(1048576) vruntime(374399522) slice(2800000) deadline(377194355) curr?(1) task?(0)
[ 3639.309736][T52604] se: weight(1048576) vruntime(374401311) slice(2800000) deadline(377195222) curr?(1) task?(0)
[ 3639.321193][T52604] se: weight(1048576) vruntime(374401409) slice(2800000) deadline(377196542) curr?(1) task?(0)
[ 3639.332647][T52604] se: weight(1048576) vruntime(374402505) slice(2800000) deadline(377197408) curr?(1) task?(0)
[ 3639.344100][T52604] se: weight(1048576) vruntime(374409704) slice(2800000) deadline(377204866) curr?(1) task?(0)
[ 3639.355552][T52604] se: weight(1048576) vruntime(374410091) slice(2800000) deadline(377205775) curr?(1) task?(0)
[ 3639.367006][T52604] se: weight(1048576) vruntime(374406331) slice(2800000) deadline(377206331) curr?(1) task?(0)
[ 3639.378462][T52604] se: weight(1048576) vruntime(374415598) slice(2800000) deadline(377209438) curr?(1) task?(0)
[ 3639.389910][T52604] se: weight(1048576) vruntime(374415323) slice(2800000) deadline(377210295) curr?(1) task?(0)
[ 3639.401358][T52604] se: weight(1048576) vruntime(374421182) slice(2800000) deadline(377214081) curr?(1) task?(0)
[ 3639.412811][T52604] se: weight(1048576) vruntime(374421259) slice(2800000) deadline(377215581) curr?(1) task?(0)
[ 3639.424265][T52604] se: weight(1048576) vruntime(374422667) slice(2800000) deadline(377216979) curr?(1) task?(0)
[ 3639.435715][T52604] se: weight(1048576) vruntime(374422554) slice(2800000) deadline(377217236) curr?(1) task?(0)
[ 3639.447168][T52604] se: weight(1048576) vruntime(374424934) slice(2800000) deadline(377220077) curr?(1) task?(0)
[ 3639.458624][T52604] se: weight(1048576) vruntime(374425846) slice(2800000) deadline(377222020) curr?(1) task?(0)
[ 3639.470079][T52604] se: weight(1048576) vruntime(374429395) slice(2800000) deadline(377222064) curr?(1) task?(0)
[ 3639.481535][T52604] se: weight(1048576) vruntime(374433944) slice(2800000) deadline(377229067) curr?(1) task?(0)
[ 3639.492990][T52604] se: weight(1048576) vruntime(374436086) slice(2800000) deadline(377230788) curr?(1) task?(0)
[ 3639.504445][T52604] se: weight(1048576) vruntime(374437470) slice(2800000) deadline(377233104) curr?(1) task?(0)
[ 3639.515896][T52604] se: weight(1048576) vruntime(374444327) slice(2800000) deadline(377236516) curr?(1) task?(0)
[ 3639.527350][T52604] se: weight(1048576) vruntime(374440546) slice(2800000) deadline(377237020) curr?(1) task?(0)
[ 3639.538805][T52604] se: weight(1048576) vruntime(374445540) slice(2800000) deadline(377239511) curr?(1) task?(0)
[ 3639.550259][T52604] se: weight(1048576) vruntime(374445451) slice(2800000) deadline(377239752) curr?(1) task?(0)
[ 3639.561717][T52604] se: weight(1048576) vruntime(374442295) slice(2800000) deadline(377242295) curr?(1) task?(0)
[ 3639.573173][T52604] se: weight(1048576) vruntime(374452271) slice(2800000) deadline(377247113) curr?(1) task?(0)
[ 3639.584626][T52604] se: weight(1048576) vruntime(374454256) slice(2800000) deadline(377249599) curr?(1) task?(0)
[ 3639.596078][T52604] se: weight(1048576) vruntime(374463449) slice(2800000) deadline(377256759) curr?(1) task?(0)
[ 3639.607532][T52604] se: weight(1048576) vruntime(374461967) slice(2800000) deadline(377256779) curr?(1) task?(0)
[ 3639.618985][T52604] se: weight(1048576) vruntime(374461483) slice(2800000) deadline(377261483) curr?(1) task?(0)
[ 3639.630441][T52604] se: weight(1048576) vruntime(374467281) slice(2800000) deadline(377261763) curr?(1) task?(0)
[ 3639.641897][T52604] se: weight(1048576) vruntime(374469851) slice(2800000) deadline(377269851) curr?(1) task?(0)
[ 3639.653344][T52604] se: weight(1048576) vruntime(374476097) slice(2800000) deadline(377272192) curr?(1) task?(0)
[ 3639.664796][T52604] se: weight(1048576) vruntime(374474099) slice(2800000) deadline(377274099) curr?(1) task?(0)
[ 3639.676251][T52604] se: weight(1048576) vruntime(374482043) slice(2800000) deadline(377277185) curr?(1) task?(0)
[ 3639.687702][T52604] se: weight(1048576) vruntime(374483245) slice(2800000) deadline(377278117) curr?(1) task?(0)
[ 3639.699156][T52604] se: weight(1048576) vruntime(374484011) slice(2800000) deadline(377284011) curr?(1) task?(0)
[ 3639.710613][T52604] se: weight(1048576) vruntime(374492728) slice(2800000) deadline(377287130) curr?(1) task?(0)
[ 3639.722068][T52604] se: weight(1048576) vruntime(374493797) slice(2800000) deadline(377288409) curr?(1) task?(0)
[ 3639.733524][T52604] se: weight(1048576) vruntime(374490308) slice(2800000) deadline(377290308) curr?(1) task?(0)
[ 3639.744978][T52604] se: weight(1048576) vruntime(374496341) slice(2800000) deadline(377290733) curr?(1) task?(0)
[ 3639.756432][T52604] se: weight(1048576) vruntime(374499138) slice(2800000) deadline(377294261) curr?(1) task?(0)
[ 3639.767885][T52604] se: weight(1048576) vruntime(374500459) slice(2800000) deadline(377296112) curr?(1) task?(0)
[ 3639.779339][T52604] se: weight(1048576) vruntime(374502827) slice(2800000) deadline(377297690) curr?(1) task?(0)
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[ 3639.802248][T52604] se: weight(1048576) vruntime(374502995) slice(2800000) deadline(377298048) curr?(1) task?(0)
[ 3639.813706][T52604] se: weight(1048576) vruntime(374505915) slice(2800000) deadline(377299956) curr?(1) task?(0)
[ 3639.825162][T52604] se: weight(1048576) vruntime(374505598) slice(2800000) deadline(377301092) curr?(1) task?(0)
[ 3639.836616][T52604] se: weight(1048576) vruntime(374507584) slice(2800000) deadline(377301485) curr?(1) task?(0)
[ 3639.848068][T52604] se: weight(1048576) vruntime(374508638) slice(2800000) deadline(377303150) curr?(1) task?(0)
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[ 3639.882429][T52604] se: weight(1048576) vruntime(374515641) slice(2800000) deadline(377312105) curr?(1) task?(0)
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[ 3640.008410][T52604] se: weight(1048576) vruntime(374539281) slice(2800000) deadline(377334243) curr?(1) task?(0)
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[ 3640.042760][T52604] se: weight(1048576) vruntime(374544155) slice(2800000) deadline(377335652) curr?(1) task?(0)
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[ 3640.134398][T52604] se: weight(1048576) vruntime(374577388) slice(2800000) deadline(377369095) curr?(1) task?(0)
[ 3640.145854][T52604] se: weight(1048576) vruntime(374579872) slice(2800000) deadline(377374914) curr?(1) task?(0)
[ 3640.157302][T52604] se: weight(1048576) vruntime(374576670) slice(2800000) deadline(377376670) curr?(1) task?(0)
[ 3640.168755][T52604] se: weight(1048576) vruntime(374584099) slice(2800000) deadline(377379281) curr?(1) task?(0)
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[ 3640.203116][T52604] se: weight(1048576) vruntime(374600030) slice(2800000) deadline(377392098) curr?(1) task?(0)
[ 3640.214571][T52604] se: weight(1048576) vruntime(374604603) slice(2800000) deadline(377398464) curr?(1) task?(0)
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[ 3640.237483][T52604] se: weight(1048576) vruntime(374612188) slice(2800000) deadline(377404226) curr?(1) task?(0)
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[ 3640.260391][T52604] se: weight(1048576) vruntime(374617243) slice(2800000) deadline(377411334) curr?(1) task?(0)
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[ 3640.306202][T52604] se: weight(1048576) vruntime(374628606) slice(2800000) deadline(377428606) curr?(1) task?(0)
[ 3640.317659][T52604] se: weight(1048576) vruntime(374636211) slice(2800000) deadline(377431624) curr?(1) task?(0)
[ 3640.329114][T52604] se: weight(1048576) vruntime(374636267) slice(2800000) deadline(377431630) curr?(1) task?(0)
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[ 3640.352020][T52604] se: weight(1048576) vruntime(374635778) slice(2800000) deadline(377435778) curr?(1) task?(0)
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[ 3640.581102][T52604] se: weight(1048576) vruntime(374685179) slice(2800000) deadline(377479581) curr?(1) task?(0)
[ 3640.592555][T52604] se: weight(1048576) vruntime(374687393) slice(2800000) deadline(377479911) curr?(1) task?(0)
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[ 3640.615461][T52604] se: weight(1048576) vruntime(374692877) slice(2800000) deadline(377488009) curr?(1) task?(0)
[ 3640.626915][T52604] se: weight(1048576) vruntime(374694247) slice(2800000) deadline(377488919) curr?(1) task?(0)
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[ 3640.649819][T52604] se: weight(1048576) vruntime(374700158) slice(2800000) deadline(377495581) curr?(1) task?(0)
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[ 3642.528231][T52604] se: weight(1048576) vruntime(375500311) slice(2800000) deadline(378290276) curr?(1) task?(0)
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[ 3642.562589][T52604] se: weight(1048576) vruntime(375542801) slice(2800000) deadline(378335170) curr?(1) task?(0)
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[ 3642.608401][T52604] se: weight(1048576) vruntime(375544678) slice(2800000) deadline(378339650) curr?(1) task?(0)
[ 3642.619853][T52604] se: weight(1048576) vruntime(375570740) slice(2800000) deadline(378365091) curr?(1) task?(0)
[ 3642.631305][T52604] se: weight(1048576) vruntime(375593170) slice(2800000) deadline(378387321) curr?(1) task?(0)
[ 3642.642757][T52604] se: weight(1048576) vruntime(375596169) slice(2800000) deadline(378389960) curr?(1) task?(0)
[ 3642.654214][T52604] se: weight(1048576) vruntime(375595449) slice(2800000) deadline(378391994) curr?(1) task?(0)
[ 3642.665661][T52604] se: weight(1048576) vruntime(375599417) slice(2800000) deadline(378394981) curr?(1) task?(0)
[ 3642.677117][T52604] se: weight(1048576) vruntime(375596317) slice(2800000) deadline(378396317) curr?(1) task?(0)
[ 3642.688570][T52604] se: weight(1048576) vruntime(375603501) slice(2800000) deadline(378403501) curr?(1) task?(0)
[ 3642.700015][T52604] se: weight(1048576) vruntime(375617770) slice(2800000) deadline(378411060) curr?(1) task?(0)
[ 3642.711467][T52604] se: weight(1048576) vruntime(375617901) slice(2800000) deadline(378411561) curr?(1) task?(0)
[ 3642.722921][T52604] se: weight(1048576) vruntime(375628426) slice(2800000) deadline(378421465) curr?(1) task?(0)
[ 3642.734376][T52604] se: weight(1048576) vruntime(375638325) slice(2800000) deadline(378431895) curr?(1) task?(0)
[ 3642.745831][T52604] se: weight(1048576) vruntime(375636757) slice(2800000) deadline(378431990) curr?(1) task?(0)
[ 3642.757287][T52604] se: weight(1048576) vruntime(375637839) slice(2800000) deadline(378432301) curr?(1) task?(0)
[ 3642.768741][T52604] se: weight(1048576) vruntime(375644237) slice(2800000) deadline(378437016) curr?(1) task?(0)
[ 3642.780186][T52604] se: weight(1048576) vruntime(375640962) slice(2800000) deadline(378440962) curr?(1) task?(0)
[ 3642.791637][T52604] se: weight(1048576) vruntime(375647723) slice(2800000) deadline(378447723) curr?(1) task?(0)
[ 3642.803090][T52604] se: weight(1048576) vruntime(375662925) slice(2800000) deadline(378456616) curr?(1) task?(0)
[ 3642.814545][T52604] se: weight(1048576) vruntime(375665957) slice(2800000) deadline(378459357) curr?(1) task?(0)
[ 3642.825997][T52604] se: weight(1048576) vruntime(375673086) slice(2800000) deadline(378467298) curr?(1) task?(0)
[ 3642.837447][T52604] se: weight(1048576) vruntime(375685432) slice(2800000) deadline(378478652) curr?(1) task?(0)
[ 3642.848905][T52604] se: weight(1048576) vruntime(375689304) slice(2800000) deadline(378483365) curr?(1) task?(0)
[ 3642.860358][T52604] se: weight(1048576) vruntime(375690267) slice(2800000) deadline(378484028) curr?(1) task?(0)
[ 3642.871810][T52604] se: weight(1048576) vruntime(375691846) slice(2800000) deadline(378487179) curr?(1) task?(0)
[ 3642.883262][T52604] se: weight(1048576) vruntime(375697741) slice(2800000) deadline(378491010) curr?(1) task?(0)
[ 3642.894715][T52604] se: weight(1048576) vruntime(375698157) slice(2800000) deadline(378492208) curr?(1) task?(0)
[ 3642.906170][T52604] se: weight(1048576) vruntime(375719406) slice(2800000) deadline(378509892) curr?(1) task?(0)
[ 3642.917626][T52604] se: weight(1048576) vruntime(375717481) slice(2800000) deadline(378510550) curr?(1) task?(0)
[ 3642.929072][T52604] se: weight(1048576) vruntime(375732595) slice(2800000) deadline(378526696) curr?(1) task?(0)
[ 3642.940525][T52604] se: weight(1048576) vruntime(375736620) slice(2800000) deadline(378530972) curr?(1) task?(0)
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[ 3642.963429][T52604] se: weight(1048576) vruntime(375750495) slice(2800000) deadline(378544115) curr?(1) task?(0)
[ 3642.974883][T52604] se: weight(1048576) vruntime(375755709) slice(2800000) deadline(378549470) curr?(1) task?(0)
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[ 3642.997793][T52604] se: weight(1048576) vruntime(375759239) slice(2800000) deadline(378553491) curr?(1) task?(0)
[ 3643.009250][T52604] se: weight(1048576) vruntime(375765940) slice(2800000) deadline(378558069) curr?(1) task?(0)
[ 3643.020704][T52604] se: weight(1048576) vruntime(375767087) slice(2800000) deadline(378560047) curr?(1) task?(0)
[ 3643.032151][T52604] se: weight(1048576) vruntime(375774807) slice(2800000) deadline(378568918) curr?(1) task?(0)
[ 3643.043602][T52604] se: weight(1048576) vruntime(375780215) slice(2800000) deadline(378573675) curr?(1) task?(0)
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[ 3643.066511][T52604] se: weight(1048576) vruntime(375793568) slice(2800000) deadline(378590493) curr?(1) task?(0)
[ 3643.077964][T52604] se: weight(1048576) vruntime(375800015) slice(2800000) deadline(378594396) curr?(1) task?(0)
[ 3643.089421][T52604] se: weight(1048576) vruntime(375808427) slice(2800000) deadline(378601276) curr?(1) task?(0)
[ 3643.100879][T52604] se: weight(1048576) vruntime(375807013) slice(2800000) deadline(378602236) curr?(1) task?(0)
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[ 3643.158148][T52604] se: weight(1048576) vruntime(375873585) slice(2800000) deadline(378664682) curr?(1) task?(0)
[ 3643.169596][T52604] se: weight(1048576) vruntime(375879581) slice(2800000) deadline(378673021) curr?(1) task?(0)
[ 3643.181043][T52604] se: weight(1048576) vruntime(375884839) slice(2800000) deadline(378678039) curr?(1) task?(0)
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[ 3643.238311][T52604] se: weight(1048576) vruntime(375906892) slice(2800000) deadline(378702115) curr?(1) task?(0)
[ 3643.249767][T52604] se: weight(1048576) vruntime(375915733) slice(2800000) deadline(378710175) curr?(1) task?(0)
[ 3643.261223][T52604] se: weight(1048576) vruntime(375917549) slice(2800000) deadline(378713093) curr?(1) task?(0)
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[ 3643.765192][T52604] se: weight(1048576) vruntime(376385884) slice(2800000) deadline(379175608) curr?(1) task?(0)
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[ 3643.811008][T52604] se: weight(1048576) vruntime(376572281) slice(2800000) deadline(379365641) curr?(1) task?(0)
[ 3643.822463][T52604] se: weight(1048576) vruntime(376591897) slice(2800000) deadline(379385487) curr?(1) task?(0)
[ 3643.833917][T52604] se: weight(1048576) vruntime(376762253) slice(2800000) deadline(379558738) curr?(1) task?(0)
[ 3643.845375][T52604] se: weight(1048576) vruntime(376775262) slice(2800000) deadline(379575262) curr?(1) task?(0)
[ 3643.856831][T52604] se: weight(1048576) vruntime(376872694) slice(2800000) deadline(379667125) curr?(1) task?(0)
[ 3643.868283][T52604] se: weight(1048576) vruntime(376951672) slice(2800000) deadline(379746565) curr?(1) task?(0)
[ 3643.879737][T52604] se: weight(1048576) vruntime(376975946) slice(2800000) deadline(379768796) curr?(1) task?(0)
[ 3643.891189][T52604] se: weight(1048576) vruntime(376992379) slice(2800000) deadline(379787071) curr?(1) task?(0)
[ 3643.902642][T52604] se: weight(1048576) vruntime(377003763) slice(2800000) deadline(379798725) curr?(1) task?(0)
[ 3643.914100][T52604] se: weight(1048576) vruntime(377019516) slice(2800000) deadline(379814859) curr?(1) task?(0)
[ 3643.925556][T52604] se: weight(1048576) vruntime(377073943) slice(2800000) deadline(379868605) curr?(1) task?(0)
[ 3643.937010][T52604] se: weight(1048576) vruntime(377153630) slice(2800000) deadline(379948783) curr?(1) task?(0)
[ 3643.948464][T52604] se: weight(1048576) vruntime(377157752) slice(2800000) deadline(379952334) curr?(1) task?(0)
[ 3643.959916][T52604] se: weight(1048576) vruntime(377242232) slice(2800000) deadline(380037796) curr?(1) task?(0)
[ 3643.971367][T52604] se: weight(1048576) vruntime(377327657) slice(2800000) deadline(380122719) curr?(1) task?(0)
[ 3643.982820][T52604] se: weight(1048576) vruntime(377334887) slice(2800000) deadline(380127776) curr?(1) task?(0)
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 6:28 ` K Prateek Nayak
@ 2026-02-11 8:50 ` K Prateek Nayak
0 siblings, 0 replies; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-11 8:50 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Doug Smythies, mingo, juri.lelli, vincent.guittot,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
[-- Attachment #1: Type: text/plain, Size: 6412 bytes --]
Hello Peter,
On 2/11/2026 11:58 AM, K Prateek Nayak wrote:
> I'll go back and fix my debug patch to give a full view of series of
> events that leads to this but in the meantime I've added the full log
> below if someone wants to take a look.
Attached is archive of trace. Should expand to give a "timeline.trace"
file. Following are some series of events before the failed pick:
Note: "cfs_rq: depth(1) ..." is the cfs_rq which fails but the first
"dump_h_overflow_cfs_rq: cfs_rq: ..." will note depth as "0" which is
the depth of padding and is not the actual cfs-rq depth.
The lines after "pick_task_fair: cfs_rq of overflow:" dumps the cfs_rq
and the queued entities that failed the pick.
...
[006] ... : __enqueue_entity: Enqueue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(-7389160032126894080) sum_weight(2169503744) zero_vruntime(18446744052406571137) sum_shift(0) avg_vruntime(18446744052406571137)
[006] ... : __dequeue_entity: Dequeue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(3512818056739946496) sum_weight(2168455168) zero_vruntime(18446744055883646744) sum_shift(0) avg_vruntime(18446744055883646744)
[006] ... : __enqueue_entity: Enqueue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(1653261820069150720) sum_weight(2169503744) zero_vruntime(18446744056741357296) sum_shift(0) avg_vruntime(18446744056741357296)
[006] ... : __dequeue_entity: Dequeue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(3337798565006147584) sum_weight(2168455168) zero_vruntime(18446744055964215508) sum_shift(0) avg_vruntime(18446744055964215508)
...
[006] ... : __enqueue_entity: Enqueue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(-4817868778594369536) sum_weight(2169503744) zero_vruntime(18446744051221380982) sum_shift(0) avg_vruntime(18446744051221380982)
[006] ... : __dequeue_entity: Dequeue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(8703580922935508992) sum_weight(2168455168) zero_vruntime(18446744053489887930) sum_shift(0) avg_vruntime(18446744053489887930)
...
[006] ... : __enqueue_entity: Enqueue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(1049195167414747136) sum_weight(2169503744) zero_vruntime(18446744057019812035) sum_shift(0) avg_vruntime(18446744057019812035)
[006] ... : __dequeue_entity: Dequeue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(2118331978874880000) sum_weight(2168455168) zero_vruntime(18446744056526599437) sum_shift(0) avg_vruntime(18446744056526599437)
...
[006] ... : __enqueue_entity: Enqueue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(8649466989629145088) sum_weight(2169503744) zero_vruntime(18446744053516583405) sum_shift(0) avg_vruntime(18446744053516583405)
[006] ... : __dequeue_entity: Dequeue cfs_rq: depth(1) weight(2169503744) nr_queued(2069) sum_w_vruntime(-984823152929406976) sum_weight(2168455168) zero_vruntime(18446744049450913118) sum_shift(0) avg_vruntime(18446744049450913118)
...
[006] ... : pick_task_fair: cfs_rq of overflow: /* Essentially failed pick. */
[006] ... : dump_h_overflow_cfs_rq: cfs_rq: ... weight(2169503744) nr_queued(2069) sum_w_vruntime(-59587237455593472) sum_weight(2168455168) zero_vruntime(18446744049024233365) sum_shift(0) avg_vruntime(18446744049024233365)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744057295755695) slice(2800000) deadline(18446744057298552230) curr?(1) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744057379145967) slice(2800000) deadline(18446744057381940989) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744057463106601) slice(2800000) deadline(18446744057465901974) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744057487667304) slice(2800000) deadline(18446744057490461976) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744058420769904) slice(2800000) deadline(18446744058423566108) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744058486927372) slice(2800000) deadline(18446744058489723636) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744061273836896) slice(2800000) deadline(18446744061276631077) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744061535759861) slice(2800000) deadline(18446744061538554473) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744061788668421) slice(2800000) deadline(18446744061791464976) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744062846656914) slice(2800000) deadline(18446744062849454680) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744064164417134) slice(2800000) deadline(18446744064167214230) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(18446744065239426914) slice(2800000) deadline(18446744065242224540) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(880604900) slice(2800000) deadline(883328346) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(880537321) slice(2800000) deadline(883331492) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(880537194) slice(2800000) deadline(883333328) curr?(0) task?(1) delayed?(0) se_depth(1)
[006] ... : dump_h_overflow_entity: se: weight(1048576) vruntime(880540318) slice(2800000) deadline(883334689) curr?(0) task?(1) delayed?(0) se_depth(1)
...
The avg_vruntime(18446744049024233365) = -24685318251 (s64) is smaller
than that of all the vruntime of queued entities.
Peter, Could it be the "left bias" in avg_vruntime() coming into play
with larger "cfs_rq->sum_weight"?
--
Thanks and Regards,
Prateek
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^ permalink raw reply [flat|nested] 70+ messages in thread
* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 18:09 ` K Prateek Nayak
2026-02-10 18:35 ` Peter Zijlstra
@ 2026-02-11 23:09 ` Doug Smythies
1 sibling, 0 replies; 70+ messages in thread
From: Doug Smythies @ 2026-02-11 23:09 UTC (permalink / raw)
To: 'K Prateek Nayak', 'Peter Zijlstra'
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, Doug Smythies
[-- Attachment #1: Type: text/plain, Size: 1394 bytes --]
On 2026.02.10 10:09 K Prateek Nayak wrote:
> On 2/10/2026 9:11 PM, Doug Smythies wrote:
>> My test computer also hung under the heavy heavy load test,
>> albeit at a higher load than before.
>> There was no log information that I could find after the re-boot.
>
> Could you run the same scenario with PARANOID_AVG:
>
> echo PARANOID_AVG > /sys/kernel/debug/sched/features
>
> and once you are past the point when the system would have usually
> hung, can check if the "sum_shifts" reported for cfs_rq in the
> debugfs have changed to some non-zero value:
>
> grep "shift.*: [^0]$" /sys/kernel/debug/sched/debug
>
> I'm assuming this is the same "yes" x 12500 copies bomb that failed.
> Let me see if I can reproduce this on my setup by leaving it going
> overnight on a limited cpuset.
>
> Since you mentioned there is some bound to the number of copies when
> the hang is observed, can you please share your system details and
> the number of CPUs it has?
I tried several times with PARANOID_AVG during my original work
with what I am calling "V1" of Peter's patch set. That was last week.
I never got a non-zero value.
Today, with what I am calling "V3" of Peter's patch set, I was
not able to get past the NO_PARANOID_AVG conditions.
I also never saw a non-zero value while trying as the number
of tasks ramped up.
An updated tasks verses elapsed time graph is attached.
... Doug
[-- Attachment #2: pz-tasks.png --]
[-- Type: image/png, Size: 36364 bytes --]
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 15:41 ` Doug Smythies
2026-02-10 18:09 ` K Prateek Nayak
@ 2026-02-10 18:52 ` Peter Zijlstra
1 sibling, 0 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-10 18:52 UTC (permalink / raw)
To: Doug Smythies
Cc: 'K Prateek Nayak', mingo, juri.lelli, vincent.guittot,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Tue, Feb 10, 2026 at 07:41:58AM -0800, Doug Smythies wrote:
> On 2026.02.09.07:47 Peter Zijlstra wrote:
> > On Wed, Feb 04, 2026 at 03:45:58PM +0530, K Prateek Nayak wrote:
> >
> >> # Overflow on enqueue
> >>
> >> <...>-102371 [255] ... : __enqueue_entity: Overflowed cfs_rq:
> >> <...>-102371 [255] ... : dump_h_overflow_cfs_rq: cfs_rq: depth(0) weight(90894772) nr_queued(2) sum_w_vruntime(0)
> sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809615900788)
> >> <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(3508) vruntime(701809615900788) slice(2800000)
> deadline(701810568648095) curr?(1) task?(1) <-------- cfs_rq->curr
> >> <...>-102371 [255] ... : __enqueue_entity: Overflowed se:
> >> <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(90891264) vruntime(701808975077099) slice(2800000)
> deadline(701808975109401) curr?(0) task?(0) <-------- new se
> >
> > So I spend a whole time trying to reproduce the splat, but alas.
> >
> > That said, I did spot something 'funny' in the above, note that
> > zero_vruntime and avg_vruntime/curr->vruntime are significantly apart.
> > That is not something that should happen. zero_vruntime is supposed to
> > closely track avg_vruntime.
> >
> > That lead me to hypothesise that there is a problem tracking
> > zero_vruntime when there is but a single runnable task, and sure
> > enough, I could reproduce that, albeit not at such a scale as to lead to
> > such problems (probably too much noise on my machine).
> >
> > I ended up with the below; and I've already pushed out a fresh
> > queue/sched/core. Could you please test again?
>
> I tested this "V2". The CPU migration times test results are not good.
> We expect the sample time to not deviate from the nominal 1 second
> by more than 10 milliseconds for this test. The test ran for about
> 13 hours and 41 minutes (49,243 samples). Histogram of times:
>
> It seems something has regressed over the last year.
> Our threshold of 10 milliseconds was rather arbitrary.
Moo.. I'll go dig out that benchmark too.
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-09 15:47 ` Peter Zijlstra
` (2 preceding siblings ...)
2026-02-10 15:41 ` Doug Smythies
@ 2026-02-10 20:52 ` Vincent Guittot
2026-02-11 5:21 ` Doug Smythies
2026-02-11 8:48 ` Peter Zijlstra
3 siblings, 2 replies; 70+ messages in thread
From: Vincent Guittot @ 2026-02-10 20:52 UTC (permalink / raw)
To: Peter Zijlstra
Cc: K Prateek Nayak, mingo, juri.lelli, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
On Mon, 9 Feb 2026 at 16:47, Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Wed, Feb 04, 2026 at 03:45:58PM +0530, K Prateek Nayak wrote:
>
> > # Overflow on enqueue
> >
> > <...>-102371 [255] ... : __enqueue_entity: Overflowed cfs_rq:
> > <...>-102371 [255] ... : dump_h_overflow_cfs_rq: cfs_rq: depth(0) weight(90894772) nr_queued(2) sum_w_vruntime(0) sum_weight(0) zero_vruntime(701164930256050) sum_shift(0) avg_vruntime(701809615900788)
> > <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(3508) vruntime(701809615900788) slice(2800000) deadline(701810568648095) curr?(1) task?(1) <-------- cfs_rq->curr
> > <...>-102371 [255] ... : __enqueue_entity: Overflowed se:
> > <...>-102371 [255] ... : dump_h_overflow_entity: se: weight(90891264) vruntime(701808975077099) slice(2800000) deadline(701808975109401) curr?(0) task?(0) <-------- new se
>
> So I spend a whole time trying to reproduce the splat, but alas.
>
> That said, I did spot something 'funny' in the above, note that
> zero_vruntime and avg_vruntime/curr->vruntime are significantly apart.
> That is not something that should happen. zero_vruntime is supposed to
> closely track avg_vruntime.
>
> That lead me to hypothesise that there is a problem tracking
> zero_vruntime when there is but a single runnable task, and sure
> enough, I could reproduce that, albeit not at such a scale as to lead to
> such problems (probably too much noise on my machine).
>
> I ended up with the below; and I've already pushed out a fresh
> queue/sched/core. Could you please test again?
>
> ---
> Subject: sched/fair: Fix zero_vruntime tracking
> From: Peter Zijlstra <peterz@infradead.org>
> Date: Mon Feb 9 15:28:16 CET 2026
>
> It turns out that zero_vruntime tracking is broken when there is but a single
> task running. Current update paths are through __{en,de}queue_entity(), and
> when there is but a single task, pick_next_task() will always return that one
> task, and put_prev_set_next_task() will end up in neither function.
>
> This can cause entity_key() to grow indefinitely large and cause overflows,
> leading to much pain and suffering.
>
> Furtermore, doing update_zero_vruntime() from __{de,en}queue_entity(), which
> are called from {set_next,put_prev}_entity() has problems because:
>
> - set_next_entity() calls __dequeue_entity() before it does cfs_rq->curr = se.
> This means the avg_vruntime() will see the removal but not current, missing
> the entity for accounting.
>
> - put_prev_entity() calls __enqueue_entity() before it does cfs_rq->curr =
> NULL. This means the avg_vruntime() will see the addition *and* current,
> leading to double accounting.
>
> Both cases are incorrect.
>
> Noting that avg_vruntime is already called on each {en,de}queue, remove the
> explicit avg_vruntime() calls (which removes an extra 64bit division for each
> {en,de}queue) and have avg_vruntime() update zero_vruntime itself.
>
> Additionally, have the tick call avg_vruntime() -- discarding the result, but
> for the side-effect of updating zero_vruntime.
>
> While there, optimize avg_vruntime() by noting that the average of one value is
> rather trivial to compute.
>
> Test case:
> # taskset -c -p 1 $$
> # taskset -c 2 bash -c 'while :; do :; done&'
> # cat /sys/kernel/debug/sched/debug | awk '/^cpu#/ {P=0} /^cpu#2,/ {P=1} {if (P) print $0}' | grep -e zero_vruntime -e "^>"
>
> PRE:
> .zero_vruntime : 31316.407903
> >R bash 487 50787.345112 E 50789.145972 2.800000 50780.298364 16 120 0.000000 0.000000 0.000000 /
> .zero_vruntime : 382548.253179
> >R bash 487 427275.204288 E 427276.003584 2.800000 427268.157540 23 120 0.000000 0.000000 0.000000 /
>
> POST:
> .zero_vruntime : 17259.709467
> >R bash 526 17259.709467 E 17262.509467 2.800000 16915.031624 9 120 0.000000 0.000000 0.000000 /
> .zero_vruntime : 18702.723356
> >R bash 526 18702.723356 E 18705.523356 2.800000 18358.045513 9 120 0.000000 0.000000 0.000000 /
>
> Fixes: 79f3f9bedd14 ("sched/eevdf: Fix min_vruntime vs avg_vruntime")
> Reported-by: K Prateek Nayak <kprateek.nayak@amd.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Hi Peter,
This patch w/ the patchset on top of tip/sched/core create regressions
for hackbench (tbench doesn't seem to be impacted) on my dragonboard
rb5
All hackbench tests are regressing. Some results below
hackbench 1 group process socket
0.579(+/-1.3%) vs 0.697-+/-2.7%) : -20%
hackbench 8 group process socket
0.650(+/-1%) vs 2.361(+/-8.8%) : -263%
hackbench 1 group thread pipe
0.885(+/-1.6%) vs 0.969-+/-1.4%) : -10%
hackbench 8 group thread pipe
0.689(+/-3.2%) vs 1.916(+/-6.7%) : -178%
The regression starts with patch 3
I haven't found the root cause and will look more deeply tomorrow
> ---
> kernel/sched/fair.c | 81 +++++++++++++++++++++++++++++++++++-----------------
> 1 file changed, 55 insertions(+), 26 deletions(-)
>
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -589,6 +589,21 @@ static inline bool entity_before(const s
> return vruntime_cmp(a->deadline, "<", b->deadline);
> }
>
> +/*
> + * Per avg_vruntime() below, cfs_rq::zero_vruntime is only slightly stale
> + * and this value should be no more than two lag bounds. Which puts it in the
> + * general order of:
> + *
> + * (slice + TICK_NSEC) << NICE_0_LOAD_SHIFT
> + *
> + * which is around 44 bits in size (on 64bit); that is 20 for
> + * NICE_0_LOAD_SHIFT, another 20 for NSEC_PER_MSEC and then a handful for
> + * however many msec the actual slice+tick ends up begin.
> + *
> + * (disregarding the actual divide-by-weight part makes for the worst case
> + * weight of 2, which nicely cancels vs the fuzz in zero_vruntime not actually
> + * being the zero-lag point).
> + */
> static inline s64 entity_key(struct cfs_rq *cfs_rq, struct sched_entity *se)
> {
> return vruntime_op(se->vruntime, "-", cfs_rq->zero_vruntime);
> @@ -676,39 +691,60 @@ sum_w_vruntime_sub(struct cfs_rq *cfs_rq
> }
>
> static inline
> -void sum_w_vruntime_update(struct cfs_rq *cfs_rq, s64 delta)
> +void update_zero_vruntime(struct cfs_rq *cfs_rq, s64 delta)
> {
> /*
> * v' = v + d ==> sum_w_vruntime' = sum_runtime - d*sum_weight
> */
> cfs_rq->sum_w_vruntime -= cfs_rq->sum_weight * delta;
> + cfs_rq->zero_vruntime += delta;
> }
>
> /*
> - * Specifically: avg_runtime() + 0 must result in entity_eligible() := true
> + * Specifically: avg_vruntime() + 0 must result in entity_eligible() := true
> * For this to be so, the result of this function must have a left bias.
> + *
> + * Called in:
> + * - place_entity() -- before enqueue
> + * - update_entity_lag() -- before dequeue
> + * - entity_tick()
> + *
> + * This means it is one entry 'behind' but that puts it close enough to where
> + * the bound on entity_key() is at most two lag bounds.
> */
> u64 avg_vruntime(struct cfs_rq *cfs_rq)
> {
> struct sched_entity *curr = cfs_rq->curr;
> - s64 avg = cfs_rq->sum_w_vruntime;
> - long load = cfs_rq->sum_weight;
> + s64 delta = 0, runtime = cfs_rq->sum_w_vruntime;
> + long weight = cfs_rq->sum_weight;
>
> - if (curr && curr->on_rq) {
> - unsigned long weight = scale_load_down(curr->load.weight);
> + if (curr && !curr->on_rq)
> + curr = NULL;
>
> - avg += entity_key(cfs_rq, curr) * weight;
> - load += weight;
> - }
> + if (weight) {
> + if (curr) {
> + unsigned long w = scale_load_down(curr->load.weight);
> +
> + runtime += entity_key(cfs_rq, curr) * w;
> + weight += w;
> + }
>
> - if (load) {
> /* sign flips effective floor / ceiling */
> - if (avg < 0)
> - avg -= (load - 1);
> - avg = div_s64(avg, load);
> + if (runtime < 0)
> + runtime -= (weight - 1);
> +
> + delta = div_s64(runtime, weight);
> +
> + } else if (curr) {
> + /*
> + * When there is but one element, it is the average.
> + */
> + delta = curr->vruntime - cfs_rq->zero_vruntime;
> }
>
> - return cfs_rq->zero_vruntime + avg;
> + update_zero_vruntime(cfs_rq, delta);
> +
> + return cfs_rq->zero_vruntime;
> }
>
> /*
> @@ -777,16 +813,6 @@ int entity_eligible(struct cfs_rq *cfs_r
> return vruntime_eligible(cfs_rq, se->vruntime);
> }
>
> -static void update_zero_vruntime(struct cfs_rq *cfs_rq)
> -{
> - u64 vruntime = avg_vruntime(cfs_rq);
> - s64 delta = vruntime_op(vruntime, "-", cfs_rq->zero_vruntime);
> -
> - sum_w_vruntime_update(cfs_rq, delta);
> -
> - cfs_rq->zero_vruntime = vruntime;
> -}
> -
> static inline u64 cfs_rq_min_slice(struct cfs_rq *cfs_rq)
> {
> struct sched_entity *root = __pick_root_entity(cfs_rq);
> @@ -856,7 +882,6 @@ RB_DECLARE_CALLBACKS(static, min_vruntim
> static void __enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
> {
> sum_w_vruntime_add(cfs_rq, se);
> - update_zero_vruntime(cfs_rq);
> se->min_vruntime = se->vruntime;
> se->min_slice = se->slice;
> rb_add_augmented_cached(&se->run_node, &cfs_rq->tasks_timeline,
> @@ -868,7 +893,6 @@ static void __dequeue_entity(struct cfs_
> rb_erase_augmented_cached(&se->run_node, &cfs_rq->tasks_timeline,
> &min_vruntime_cb);
> sum_w_vruntime_sub(cfs_rq, se);
> - update_zero_vruntime(cfs_rq);
> }
>
> struct sched_entity *__pick_root_entity(struct cfs_rq *cfs_rq)
> @@ -5524,6 +5548,11 @@ entity_tick(struct cfs_rq *cfs_rq, struc
> update_load_avg(cfs_rq, curr, UPDATE_TG);
> update_cfs_group(curr);
>
> + /*
> + * Pulls along cfs_rq::zero_vruntime.
> + */
> + avg_vruntime(cfs_rq);
> +
> #ifdef CONFIG_SCHED_HRTICK
> /*
> * queued ticks are scheduled to match the slice, so don't bother
^ permalink raw reply [flat|nested] 70+ messages in thread* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 20:52 ` Vincent Guittot
@ 2026-02-11 5:21 ` Doug Smythies
2026-02-11 8:49 ` Vincent Guittot
2026-02-11 8:48 ` Peter Zijlstra
1 sibling, 1 reply; 70+ messages in thread
From: Doug Smythies @ 2026-02-11 5:21 UTC (permalink / raw)
To: 'Vincent Guittot', 'Peter Zijlstra'
Cc: 'K Prateek Nayak', mingo, juri.lelli, dietmar.eggemann,
rostedt, bsegall, mgorman, vschneid, linux-kernel, wangtao554,
quzicheng, wuyun.abel, Doug Smythies
On 2026.02.10 12:52 Vincent Guittot wrote:
> On Mon, 9 Feb 2026 at 16:47, Peter Zijlstra <peterz@infradead.org> wrote:
>> On Wed, Feb 04, 2026 at 03:45:58PM +0530, K Prateek Nayak wrote:
>
... delete ...
> This patch w/ the patchset on top of tip/sched/core create regressions
> for hackbench (tbench doesn't seem to be impacted) on my dragonboard
> rb5
> All hackbench tests are regressing. Some results below
...
> hackbench 8 group process socket
> 0.650(+/-1%) vs 2.361(+/-8.8%) : -263%
...
Very interesting.
I only know of the Phoronix version of hackbench.
I ran what I believe to be a similar scenario to yours:
10 test runs each (the default is 3):
Kernel 6.19-rc8: 23.228 seconds average, deviation 0.39%
Kernel 6.19-rc8-pz-v2: 85.755 seconds average, deviation 3.33%
269% regression. (very similar to Vicent's results)
System:
Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz, 6 cores 12 CPUs.
CPU frequency scaling driver: intel_pstate.
CPU frequency scaling governor: powersave.
HWP: enabled.
idle governor teo.
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 5:21 ` Doug Smythies
@ 2026-02-11 8:49 ` Vincent Guittot
2026-02-11 9:01 ` Peter Zijlstra
0 siblings, 1 reply; 70+ messages in thread
From: Vincent Guittot @ 2026-02-11 8:49 UTC (permalink / raw)
To: Doug Smythies
Cc: Peter Zijlstra, K Prateek Nayak, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Wed, 11 Feb 2026 at 06:21, Doug Smythies <dsmythies@telus.net> wrote:
>
> On 2026.02.10 12:52 Vincent Guittot wrote:
> > On Mon, 9 Feb 2026 at 16:47, Peter Zijlstra <peterz@infradead.org> wrote:
> >> On Wed, Feb 04, 2026 at 03:45:58PM +0530, K Prateek Nayak wrote:
> >
> ... delete ...
>
> > This patch w/ the patchset on top of tip/sched/core create regressions
> > for hackbench (tbench doesn't seem to be impacted) on my dragonboard
> > rb5
> > All hackbench tests are regressing. Some results below
> ...
> > hackbench 8 group process socket
> > 0.650(+/-1%) vs 2.361(+/-8.8%) : -263%
> ...
>
> Very interesting.
> I only know of the Phoronix version of hackbench.
> I ran what I believe to be a similar scenario to yours:
> 10 test runs each (the default is 3):
>
> Kernel 6.19-rc8: 23.228 seconds average, deviation 0.39%
> Kernel 6.19-rc8-pz-v2: 85.755 seconds average, deviation 3.33%
> 269% regression. (very similar to Vicent's results)
patch 3 + a default value for sum_shift restore the performance
cfs_rq->sum_shift = SCHED_FIXEDPOINT_SHIFT;
There 2 issues with patch 3
*one scale_load_down remains in avg_vruntime
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 25c398ff0d59..3143ae7f07b0 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -778,7 +778,7 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
if (weight) {
if (curr) {
- unsigned long w = scale_load_down(curr->load.weight);
+ unsigned long w =
avg_vruntime_weight(curr->load.weight);
runtime += entity_key(cfs_rq, curr) * w;
weight += w;
and we still use calc_delta_fair() in update_entity_lag() but
calc_delta_fair() use scale_load_down()
>
> System:
> Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz, 6 cores 12 CPUs.
> CPU frequency scaling driver: intel_pstate.
> CPU frequency scaling governor: powersave.
> HWP: enabled.
> idle governor teo.
>
>
^ permalink raw reply related [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 8:49 ` Vincent Guittot
@ 2026-02-11 9:01 ` Peter Zijlstra
2026-02-11 10:48 ` Peter Zijlstra
0 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-11 9:01 UTC (permalink / raw)
To: Vincent Guittot
Cc: Doug Smythies, K Prateek Nayak, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Wed, Feb 11, 2026 at 09:49:57AM +0100, Vincent Guittot wrote:
> On Wed, 11 Feb 2026 at 06:21, Doug Smythies <dsmythies@telus.net> wrote:
> >
> > On 2026.02.10 12:52 Vincent Guittot wrote:
> > > On Mon, 9 Feb 2026 at 16:47, Peter Zijlstra <peterz@infradead.org> wrote:
> > >> On Wed, Feb 04, 2026 at 03:45:58PM +0530, K Prateek Nayak wrote:
> > >
> > ... delete ...
> >
> > > This patch w/ the patchset on top of tip/sched/core create regressions
> > > for hackbench (tbench doesn't seem to be impacted) on my dragonboard
> > > rb5
> > > All hackbench tests are regressing. Some results below
> > ...
> > > hackbench 8 group process socket
> > > 0.650(+/-1%) vs 2.361(+/-8.8%) : -263%
> > ...
> >
> > Very interesting.
> > I only know of the Phoronix version of hackbench.
> > I ran what I believe to be a similar scenario to yours:
> > 10 test runs each (the default is 3):
> >
> > Kernel 6.19-rc8: 23.228 seconds average, deviation 0.39%
> > Kernel 6.19-rc8-pz-v2: 85.755 seconds average, deviation 3.33%
> > 269% regression. (very similar to Vicent's results)
>
> patch 3 + a default value for sum_shift restore the performance
> cfs_rq->sum_shift = SCHED_FIXEDPOINT_SHIFT;
Hurmph.. I really wanted to do away with that, because those small
weights are fairly common in the cgroup shares thing, and will be more
common still if we do a flat pick.
> There 2 issues with patch 3
>
> *one scale_load_down remains in avg_vruntime
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 25c398ff0d59..3143ae7f07b0 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -778,7 +778,7 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
>
> if (weight) {
> if (curr) {
> - unsigned long w = scale_load_down(curr->load.weight);
> + unsigned long w =
> avg_vruntime_weight(curr->load.weight);
>
> runtime += entity_key(cfs_rq, curr) * w;
> weight += w;
AAARGHHH!! Sorry about that, clearly I've not been careful with
reshuffling patches :-(
> and we still use calc_delta_fair() in update_entity_lag() but
> calc_delta_fair() use scale_load_down()
Hmmm, indeed, let me see if I can do something about that. Perhaps just
eat the 64bit division on 64bit systems.
Anyway, let me go poke at all this.
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 9:01 ` Peter Zijlstra
@ 2026-02-11 10:48 ` Peter Zijlstra
2026-02-11 10:49 ` Peter Zijlstra
` (3 more replies)
0 siblings, 4 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-11 10:48 UTC (permalink / raw)
To: Vincent Guittot
Cc: Doug Smythies, K Prateek Nayak, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Wed, Feb 11, 2026 at 10:01:44AM +0100, Peter Zijlstra wrote:
> > There 2 issues with patch 3
> >
> > *one scale_load_down remains in avg_vruntime
> >
> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > index 25c398ff0d59..3143ae7f07b0 100644
> > --- a/kernel/sched/fair.c
> > +++ b/kernel/sched/fair.c
> > @@ -778,7 +778,7 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
> >
> > if (weight) {
> > if (curr) {
> > - unsigned long w = scale_load_down(curr->load.weight);
> > + unsigned long w =
> > avg_vruntime_weight(curr->load.weight);
> >
> > runtime += entity_key(cfs_rq, curr) * w;
> > weight += w;
>
> AAARGHHH!! Sorry about that, clearly I've not been careful with
> reshuffling patches :-(
So with that one fixed; I get (as queue/sched/core of just now):
base:
1: 0.25431 +- 0.00226 seconds time elapsed ( +- 0.89% )
2: 0.52522 +- 0.00304 seconds time elapsed ( +- 0.58% )
5: 1.10452 +- 0.00509 seconds time elapsed ( +- 0.46% )
10: 2.00673 +- 0.00761 seconds time elapsed ( +- 0.38% )
20: 3.81795 +- 0.00347 seconds time elapsed ( +- 0.09% )
40: 7.0551 +- 0.0112 seconds time elapsed ( +- 0.16% )
+1 patches/peterz-sched-fair-fix-zero_vruntime.patch
1: 0.25231 +- 0.00328 seconds time elapsed ( +- 1.30% )
2: 0.52794 +- 0.00337 seconds time elapsed ( +- 0.64% )
5: 1.09336 +- 0.00391 seconds time elapsed ( +- 0.36% )
10: 1.98787 +- 0.00660 seconds time elapsed ( +- 0.33% )
20: 3.75865 +- 0.00782 seconds time elapsed ( +- 0.21% )
40: 7.0208 +- 0.0102 seconds time elapsed ( +- 0.15% )
+2 patches/peterz-sched-fair-curb-set_protect_slice.patch
1: 0.25421 +- 0.00351 seconds time elapsed ( +- 1.38% )
2: 0.53178 +- 0.00308 seconds time elapsed ( +- 0.58% )
5: 1.09421 +- 0.00462 seconds time elapsed ( +- 0.42% )
10: 1.99843 +- 0.00289 seconds time elapsed ( +- 0.14% )
20: 3.77249 +- 0.00676 seconds time elapsed ( +- 0.18% )
40: 7.0371 +- 0.0143 seconds time elapsed ( +- 0.20% )
+3 patches/wang_tao-sched_eevdf-update_se-_vprot_in_reweight_entity.patch
1: 0.25141 +- 0.00342 seconds time elapsed ( +- 1.36% )
2: 0.53294 +- 0.00474 seconds time elapsed ( +- 0.89% )
5: 1.10944 +- 0.00447 seconds time elapsed ( +- 0.40% )
10: 2.00012 +- 0.00366 seconds time elapsed ( +- 0.18% )
20: 3.77650 +- 0.00796 seconds time elapsed ( +- 0.21% )
40: 7.0455 +- 0.0145 seconds time elapsed ( +- 0.21% )
+4 patches/peter_zijlstra-sched_fair-increase_max_lag_clamping.patch
1: 0.25096 +- 0.00415 seconds time elapsed ( +- 1.65% )
2: 0.53635 +- 0.00372 seconds time elapsed ( +- 0.69% )
5: 1.12040 +- 0.00549 seconds time elapsed ( +- 0.49% )
10: 2.00447 +- 0.00518 seconds time elapsed ( +- 0.26% )
20: 3.7682 +- 0.0104 seconds time elapsed ( +- 0.28% )
40: 7.0023 +- 0.0141 seconds time elapsed ( +- 0.20% )
+5 patches/peterz-sched-increase-avg-bits.patch
1: 0.24866 +- 0.00284 seconds time elapsed ( +- 1.14% )
2: 0.52756 +- 0.00310 seconds time elapsed ( +- 0.59% )
5: 1.09946 +- 0.00643 seconds time elapsed ( +- 0.58% )
10: 1.98256 +- 0.00398 seconds time elapsed ( +- 0.20% )
20: 3.75988 +- 0.00611 seconds time elapsed ( +- 0.16% )
40: 6.9833 +- 0.0113 seconds time elapsed ( +- 0.16% )
+6 patches/peterz-sched-revert-reweight-entity-thingy.patch
1: 0.25302 +- 0.00285 seconds time elapsed ( +- 1.13% )
2: 0.53040 +- 0.00383 seconds time elapsed ( +- 0.72% )
5: 1.08806 +- 0.00341 seconds time elapsed ( +- 0.31% )
10: 1.97696 +- 0.00592 seconds time elapsed ( +- 0.30% )
20: 3.75393 +- 0.00622 seconds time elapsed ( +- 0.17% )
40: 6.9794 +- 0.0139 seconds time elapsed ( +- 0.20% )
Now let me go check on that latency thing from Doug (although hopefully
that was the same boo-boo).
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 10:48 ` Peter Zijlstra
@ 2026-02-11 10:49 ` Peter Zijlstra
2026-02-11 11:15 ` Vincent Guittot
` (2 subsequent siblings)
3 siblings, 0 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-11 10:49 UTC (permalink / raw)
To: Vincent Guittot
Cc: Doug Smythies, K Prateek Nayak, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Wed, Feb 11, 2026 at 11:48:33AM +0100, Peter Zijlstra wrote:
> On Wed, Feb 11, 2026 at 10:01:44AM +0100, Peter Zijlstra wrote:
>
> > > There 2 issues with patch 3
> > >
> > > *one scale_load_down remains in avg_vruntime
> > >
> > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > > index 25c398ff0d59..3143ae7f07b0 100644
> > > --- a/kernel/sched/fair.c
> > > +++ b/kernel/sched/fair.c
> > > @@ -778,7 +778,7 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
> > >
> > > if (weight) {
> > > if (curr) {
> > > - unsigned long w = scale_load_down(curr->load.weight);
> > > + unsigned long w =
> > > avg_vruntime_weight(curr->load.weight);
> > >
> > > runtime += entity_key(cfs_rq, curr) * w;
> > > weight += w;
> >
> > AAARGHHH!! Sorry about that, clearly I've not been careful with
> > reshuffling patches :-(
>
> So with that one fixed; I get (as queue/sched/core of just now):
In case this wasn't clear; this is hackbench as per:
for i in 1 2 5 10 20 40 ; do
echo -n "${i}: "
perf stat --null --repeat 10 -- perf bench sched messaging -g $i -t -l 10000 2>&1 | grep "seconds time elapsed"
done
> base:
>
> 1: 0.25431 +- 0.00226 seconds time elapsed ( +- 0.89% )
> 2: 0.52522 +- 0.00304 seconds time elapsed ( +- 0.58% )
> 5: 1.10452 +- 0.00509 seconds time elapsed ( +- 0.46% )
> 10: 2.00673 +- 0.00761 seconds time elapsed ( +- 0.38% )
> 20: 3.81795 +- 0.00347 seconds time elapsed ( +- 0.09% )
> 40: 7.0551 +- 0.0112 seconds time elapsed ( +- 0.16% )
>
> +1 patches/peterz-sched-fair-fix-zero_vruntime.patch
>
> 1: 0.25231 +- 0.00328 seconds time elapsed ( +- 1.30% )
> 2: 0.52794 +- 0.00337 seconds time elapsed ( +- 0.64% )
> 5: 1.09336 +- 0.00391 seconds time elapsed ( +- 0.36% )
> 10: 1.98787 +- 0.00660 seconds time elapsed ( +- 0.33% )
> 20: 3.75865 +- 0.00782 seconds time elapsed ( +- 0.21% )
> 40: 7.0208 +- 0.0102 seconds time elapsed ( +- 0.15% )
>
> +2 patches/peterz-sched-fair-curb-set_protect_slice.patch
>
> 1: 0.25421 +- 0.00351 seconds time elapsed ( +- 1.38% )
> 2: 0.53178 +- 0.00308 seconds time elapsed ( +- 0.58% )
> 5: 1.09421 +- 0.00462 seconds time elapsed ( +- 0.42% )
> 10: 1.99843 +- 0.00289 seconds time elapsed ( +- 0.14% )
> 20: 3.77249 +- 0.00676 seconds time elapsed ( +- 0.18% )
> 40: 7.0371 +- 0.0143 seconds time elapsed ( +- 0.20% )
>
> +3 patches/wang_tao-sched_eevdf-update_se-_vprot_in_reweight_entity.patch
>
> 1: 0.25141 +- 0.00342 seconds time elapsed ( +- 1.36% )
> 2: 0.53294 +- 0.00474 seconds time elapsed ( +- 0.89% )
> 5: 1.10944 +- 0.00447 seconds time elapsed ( +- 0.40% )
> 10: 2.00012 +- 0.00366 seconds time elapsed ( +- 0.18% )
> 20: 3.77650 +- 0.00796 seconds time elapsed ( +- 0.21% )
> 40: 7.0455 +- 0.0145 seconds time elapsed ( +- 0.21% )
>
> +4 patches/peter_zijlstra-sched_fair-increase_max_lag_clamping.patch
>
> 1: 0.25096 +- 0.00415 seconds time elapsed ( +- 1.65% )
> 2: 0.53635 +- 0.00372 seconds time elapsed ( +- 0.69% )
> 5: 1.12040 +- 0.00549 seconds time elapsed ( +- 0.49% )
> 10: 2.00447 +- 0.00518 seconds time elapsed ( +- 0.26% )
> 20: 3.7682 +- 0.0104 seconds time elapsed ( +- 0.28% )
> 40: 7.0023 +- 0.0141 seconds time elapsed ( +- 0.20% )
>
> +5 patches/peterz-sched-increase-avg-bits.patch
>
> 1: 0.24866 +- 0.00284 seconds time elapsed ( +- 1.14% )
> 2: 0.52756 +- 0.00310 seconds time elapsed ( +- 0.59% )
> 5: 1.09946 +- 0.00643 seconds time elapsed ( +- 0.58% )
> 10: 1.98256 +- 0.00398 seconds time elapsed ( +- 0.20% )
> 20: 3.75988 +- 0.00611 seconds time elapsed ( +- 0.16% )
> 40: 6.9833 +- 0.0113 seconds time elapsed ( +- 0.16% )
>
> +6 patches/peterz-sched-revert-reweight-entity-thingy.patch
>
> 1: 0.25302 +- 0.00285 seconds time elapsed ( +- 1.13% )
> 2: 0.53040 +- 0.00383 seconds time elapsed ( +- 0.72% )
> 5: 1.08806 +- 0.00341 seconds time elapsed ( +- 0.31% )
> 10: 1.97696 +- 0.00592 seconds time elapsed ( +- 0.30% )
> 20: 3.75393 +- 0.00622 seconds time elapsed ( +- 0.17% )
> 40: 6.9794 +- 0.0139 seconds time elapsed ( +- 0.20% )
>
>
> Now let me go check on that latency thing from Doug (although hopefully
> that was the same boo-boo).
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 10:48 ` Peter Zijlstra
2026-02-11 10:49 ` Peter Zijlstra
@ 2026-02-11 11:15 ` Vincent Guittot
2026-02-11 16:28 ` Peter Zijlstra
2026-02-11 16:21 ` Peter Zijlstra
2026-02-11 23:25 ` Doug Smythies
3 siblings, 1 reply; 70+ messages in thread
From: Vincent Guittot @ 2026-02-11 11:15 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Doug Smythies, K Prateek Nayak, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Wed, 11 Feb 2026 at 11:48, Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Wed, Feb 11, 2026 at 10:01:44AM +0100, Peter Zijlstra wrote:
>
> > > There 2 issues with patch 3
> > >
> > > *one scale_load_down remains in avg_vruntime
> > >
> > > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > > index 25c398ff0d59..3143ae7f07b0 100644
> > > --- a/kernel/sched/fair.c
> > > +++ b/kernel/sched/fair.c
> > > @@ -778,7 +778,7 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
> > >
> > > if (weight) {
> > > if (curr) {
> > > - unsigned long w = scale_load_down(curr->load.weight);
> > > + unsigned long w =
> > > avg_vruntime_weight(curr->load.weight);
> > >
> > > runtime += entity_key(cfs_rq, curr) * w;
> > > weight += w;
> >
> > AAARGHHH!! Sorry about that, clearly I've not been careful with
> > reshuffling patches :-(
>
> So with that one fixed; I get (as queue/sched/core of just now):
yes, this is the root cause of the regression
Regarding the use of calc_delta_fair() in update_entity_lag(), we use
calc_delta_fair() for updating vruntime, deadline, vprot and vlag and
I wonder how this diff of granularity compared to avg_vruntime can be
an issue for sched_entity with a small weight
>
> base:
>
> 1: 0.25431 +- 0.00226 seconds time elapsed ( +- 0.89% )
> 2: 0.52522 +- 0.00304 seconds time elapsed ( +- 0.58% )
> 5: 1.10452 +- 0.00509 seconds time elapsed ( +- 0.46% )
> 10: 2.00673 +- 0.00761 seconds time elapsed ( +- 0.38% )
> 20: 3.81795 +- 0.00347 seconds time elapsed ( +- 0.09% )
> 40: 7.0551 +- 0.0112 seconds time elapsed ( +- 0.16% )
>
> +1 patches/peterz-sched-fair-fix-zero_vruntime.patch
>
> 1: 0.25231 +- 0.00328 seconds time elapsed ( +- 1.30% )
> 2: 0.52794 +- 0.00337 seconds time elapsed ( +- 0.64% )
> 5: 1.09336 +- 0.00391 seconds time elapsed ( +- 0.36% )
> 10: 1.98787 +- 0.00660 seconds time elapsed ( +- 0.33% )
> 20: 3.75865 +- 0.00782 seconds time elapsed ( +- 0.21% )
> 40: 7.0208 +- 0.0102 seconds time elapsed ( +- 0.15% )
>
> +2 patches/peterz-sched-fair-curb-set_protect_slice.patch
>
> 1: 0.25421 +- 0.00351 seconds time elapsed ( +- 1.38% )
> 2: 0.53178 +- 0.00308 seconds time elapsed ( +- 0.58% )
> 5: 1.09421 +- 0.00462 seconds time elapsed ( +- 0.42% )
> 10: 1.99843 +- 0.00289 seconds time elapsed ( +- 0.14% )
> 20: 3.77249 +- 0.00676 seconds time elapsed ( +- 0.18% )
> 40: 7.0371 +- 0.0143 seconds time elapsed ( +- 0.20% )
>
> +3 patches/wang_tao-sched_eevdf-update_se-_vprot_in_reweight_entity.patch
>
> 1: 0.25141 +- 0.00342 seconds time elapsed ( +- 1.36% )
> 2: 0.53294 +- 0.00474 seconds time elapsed ( +- 0.89% )
> 5: 1.10944 +- 0.00447 seconds time elapsed ( +- 0.40% )
> 10: 2.00012 +- 0.00366 seconds time elapsed ( +- 0.18% )
> 20: 3.77650 +- 0.00796 seconds time elapsed ( +- 0.21% )
> 40: 7.0455 +- 0.0145 seconds time elapsed ( +- 0.21% )
>
> +4 patches/peter_zijlstra-sched_fair-increase_max_lag_clamping.patch
>
> 1: 0.25096 +- 0.00415 seconds time elapsed ( +- 1.65% )
> 2: 0.53635 +- 0.00372 seconds time elapsed ( +- 0.69% )
> 5: 1.12040 +- 0.00549 seconds time elapsed ( +- 0.49% )
> 10: 2.00447 +- 0.00518 seconds time elapsed ( +- 0.26% )
> 20: 3.7682 +- 0.0104 seconds time elapsed ( +- 0.28% )
> 40: 7.0023 +- 0.0141 seconds time elapsed ( +- 0.20% )
>
> +5 patches/peterz-sched-increase-avg-bits.patch
>
> 1: 0.24866 +- 0.00284 seconds time elapsed ( +- 1.14% )
> 2: 0.52756 +- 0.00310 seconds time elapsed ( +- 0.59% )
> 5: 1.09946 +- 0.00643 seconds time elapsed ( +- 0.58% )
> 10: 1.98256 +- 0.00398 seconds time elapsed ( +- 0.20% )
> 20: 3.75988 +- 0.00611 seconds time elapsed ( +- 0.16% )
> 40: 6.9833 +- 0.0113 seconds time elapsed ( +- 0.16% )
>
> +6 patches/peterz-sched-revert-reweight-entity-thingy.patch
>
> 1: 0.25302 +- 0.00285 seconds time elapsed ( +- 1.13% )
> 2: 0.53040 +- 0.00383 seconds time elapsed ( +- 0.72% )
> 5: 1.08806 +- 0.00341 seconds time elapsed ( +- 0.31% )
> 10: 1.97696 +- 0.00592 seconds time elapsed ( +- 0.30% )
> 20: 3.75393 +- 0.00622 seconds time elapsed ( +- 0.17% )
> 40: 6.9794 +- 0.0139 seconds time elapsed ( +- 0.20% )
>
>
> Now let me go check on that latency thing from Doug (although hopefully
> that was the same boo-boo).
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 11:15 ` Vincent Guittot
@ 2026-02-11 16:28 ` Peter Zijlstra
2026-02-12 7:43 ` K Prateek Nayak
0 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-11 16:28 UTC (permalink / raw)
To: Vincent Guittot
Cc: Doug Smythies, K Prateek Nayak, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Wed, Feb 11, 2026 at 12:15:48PM +0100, Vincent Guittot wrote:
> Regarding the use of calc_delta_fair() in update_entity_lag(), we use
> calc_delta_fair() for updating vruntime, deadline, vprot and vlag and
> I wonder how this diff of granularity compared to avg_vruntime can be
> an issue for sched_entity with a small weight
It will effectively inflate their weight.
The below seems to 'work' -- it builds, boots and builds a kernel.
We could perhaps look at doing that reciprocal thing on unsigned long,
but meh.
---
Subject: sched/fair: Use full weight to __calc_delta()
From: Peter Zijlstra <peterz@infradead.org>
Date: Wed Feb 11 17:07:58 CET 2026
Since we now use the full weight for avg_vruntime(), also make
__calc_delta() use the full value.
Since weight is effectively NICE_0_LOAD, this is 20 bits on 64bit.
This leaves 44 bits for delta_exec, which is ~16k seconds, way longer
than any one tick would ever be, so no worry about overflow.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/sched/fair.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -259,6 +259,7 @@ static void __update_inv_weight(struct l
*/
static u64 __calc_delta(u64 delta_exec, unsigned long weight, struct load_weight *lw)
{
+#ifdef CONFIG_32BIT
u64 fact = scale_load_down(weight);
u32 fact_hi = (u32)(fact >> 32);
int shift = WMULT_SHIFT;
@@ -282,6 +283,9 @@ static u64 __calc_delta(u64 delta_exec,
}
return mul_u64_u32_shr(delta_exec, fact, shift);
+#else
+ return (delta_exec * weight) / lw->weight;
+#endif
}
/*
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 16:28 ` Peter Zijlstra
@ 2026-02-12 7:43 ` K Prateek Nayak
2026-02-12 11:59 ` Peter Zijlstra
0 siblings, 1 reply; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-12 7:43 UTC (permalink / raw)
To: Peter Zijlstra, Vincent Guittot
Cc: Doug Smythies, mingo, juri.lelli, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel
Hello Peter,
On 2/11/2026 9:58 PM, Peter Zijlstra wrote:
> On Wed, Feb 11, 2026 at 12:15:48PM +0100, Vincent Guittot wrote:
>
>> Regarding the use of calc_delta_fair() in update_entity_lag(), we use
>> calc_delta_fair() for updating vruntime, deadline, vprot and vlag and
>> I wonder how this diff of granularity compared to avg_vruntime can be
>> an issue for sched_entity with a small weight
>
> It will effectively inflate their weight.
>
> The below seems to 'work' -- it builds, boots and builds a kernel.
>
> We could perhaps look at doing that reciprocal thing on unsigned long,
> but meh.
So I was testing peterz:sched/core at commit 84230c0ac1cf ("sched/fair:
Use full weight to __calc_delta()") and it still crashes for the
exorbitantly large copies of "yes" running on 6 cores.
Here is what I've found out from today's crash on dumping the offending
cfs_rq:
...
Enqueue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(18343811230990336) sum_weight(2144337920) zero_vruntime(18337852274) sum_shift(0) avg_vruntime(18337852274)
Dequeue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(1303379968) sum_weight(2143289344) zero_vruntime(18354971669) sum_shift(0) avg_vruntime(18354971669)
Enqueue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-31233567079006208) sum_weight(2152726528) zero_vruntime(18360916028) sum_shift(0) avg_vruntime(18360916028)
Dequeue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-25773095996358656) sum_weight(2151677952) zero_vruntime(18366916795) sum_shift(0) avg_vruntime(18366916795)
Enqueue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-195993505307295744) sum_weight(2152726528) zero_vruntime(18437453448) sum_shift(0) avg_vruntime(18437453448)
Dequeue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-355777007188967424) sum_weight(2151677952) zero_vruntime(18520289238) sum_shift(0) avg_vruntime(18520289238)
Enqueue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-1523774576650092544) sum_weight(2152726528) zero_vruntime(19054245803) sum_shift(0) avg_vruntime(19054245803)
Dequeue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-3015239905359953920) sum_weight(2151677952) zero_vruntime(19756286051) sum_shift(0) avg_vruntime(19756286051)
# I'm suspecting something goes sideways at this point looking at
# the big jump that comes after in avg_vruntime()
# "6222537296247259136" has bit 63 set so could it be a wraparound
# in sum_w_vruntime?
Enqueue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(6222537296247259136) sum_weight(2152726528) zero_vruntime(24024889432) sum_shift(0) avg_vruntime(24024889432)
Dequeue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-5928597400870453248) sum_weight(2151677952) zero_vruntime(21110281285) sum_shift(0) avg_vruntime(21110281285)
cfs_rq of failed pick:
cfs_rq: depth(0) weight(2176843776) nr_queued(2076) sum_w_vruntime(-90907067772043264) sum_weight(2175795200) zero_vruntime(26921355273)
se: weight(1048576) vruntime(843832351) slice(2800000) deadline(846630448) curr?(1) task?(1) delayed?(0) se_depth(1)
se: weight(1048576) vruntime(839841550) slice(2800000) deadline(842635020) curr?(0) task?(1) delayed?(0) se_depth(1)
...
# Many entities have weight 1048576, and and vruntime around ~850,000
....
se: weight(1048576) vruntime(843832916) slice(2800000) deadline(846629681) curr?(0) task?(1) delayed?(0) se_depth(1)
se: weight(1048576) vruntime(843833563) slice(2800000) deadline(846630939) curr?(0) task?(1) delayed?(0) se_depth(1)
se: weight(1048576) vruntime(843840684) slice(2800000) deadline(846633192) curr?(0) task?(1) delayed?(0) se_depth(1)
se: weight(1048576) vruntime(18344670326) slice(2800000) deadline(18347465508) curr?(0) task?(1) delayed?(0) se_depth(1)
se: weight(1048576) vruntime(18344679852) slice(2800000) deadline(18347475866) curr?(0) task?(1) delayed?(0) se_depth(1)
se: weight(1048576) vruntime(18344682061) slice(2800000) deadline(18347477764) curr?(0) task?(1) delayed?(0) se_depth(1)
...
# Many entities have weight 1048576, and and vruntime around ~18,344,682,061
I'm running with CONFIG_HZ=250. In vruntime_eligible() we have for curr:
entity_key(curr) = -26077522922LL
weight = 1048576UL
For the cfs_rq we get:
avg = sum_w_runtime + (entity_key * weight) = -118251332447502336LL
load = sum_weight + weight = 2176843776UL
But on the way to check eligibility we compute:
entity_key * load = -56766693466253033472 (in python)
entity_key * load = -1426461245124378624LL (in C)
vruntime_eligible() returns false always as a result of the overflow and
we land in a pickle. Not sure if sum_w_vruntime itself can suffer from
a wrap around that leads to all this.
Parsing the stats based on the dump in Python gives me:
Total weight: 2176843776 (checks out)
Total weighted vruntime: 3145101113938673664
Avg (floating point): 1444798725.849711
Avg (signed 64-bit): 1444798725
Avg (unsigned 64-bit): 1444798725
which is a bit far off from the dumped stats of cfs_rq.
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 7:43 ` K Prateek Nayak
@ 2026-02-12 11:59 ` Peter Zijlstra
2026-02-12 17:16 ` Peter Zijlstra
0 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-12 11:59 UTC (permalink / raw)
To: K Prateek Nayak
Cc: Vincent Guittot, Doug Smythies, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Thu, Feb 12, 2026 at 01:13:30PM +0530, K Prateek Nayak wrote:
> Hello Peter,
>
> On 2/11/2026 9:58 PM, Peter Zijlstra wrote:
> > On Wed, Feb 11, 2026 at 12:15:48PM +0100, Vincent Guittot wrote:
> >
> >> Regarding the use of calc_delta_fair() in update_entity_lag(), we use
> >> calc_delta_fair() for updating vruntime, deadline, vprot and vlag and
> >> I wonder how this diff of granularity compared to avg_vruntime can be
> >> an issue for sched_entity with a small weight
> >
> > It will effectively inflate their weight.
> >
> > The below seems to 'work' -- it builds, boots and builds a kernel.
> >
> > We could perhaps look at doing that reciprocal thing on unsigned long,
> > but meh.
>
> So I was testing peterz:sched/core at commit 84230c0ac1cf ("sched/fair:
> Use full weight to __calc_delta()") and it still crashes for the
> exorbitantly large copies of "yes" running on 6 cores.
Ah yes, our next great adventure :-)
> Here is what I've found out from today's crash on dumping the offending
> cfs_rq:
>
> ...
> Enqueue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(18343811230990336) sum_weight(2144337920) zero_vruntime(18337852274) sum_shift(0) avg_vruntime(18337852274)
> Dequeue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(1303379968) sum_weight(2143289344) zero_vruntime(18354971669) sum_shift(0) avg_vruntime(18354971669)
This is about where things go sideways... (see argument below)
> Enqueue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-31233567079006208) sum_weight(2152726528) zero_vruntime(18360916028) sum_shift(0) avg_vruntime(18360916028)
> Dequeue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-25773095996358656) sum_weight(2151677952) zero_vruntime(18366916795) sum_shift(0) avg_vruntime(18366916795)
> Enqueue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-195993505307295744) sum_weight(2152726528) zero_vruntime(18437453448) sum_shift(0) avg_vruntime(18437453448)
> Dequeue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-355777007188967424) sum_weight(2151677952) zero_vruntime(18520289238) sum_shift(0) avg_vruntime(18520289238)
> Enqueue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-1523774576650092544) sum_weight(2152726528) zero_vruntime(19054245803) sum_shift(0) avg_vruntime(19054245803)
> Dequeue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-3015239905359953920) sum_weight(2151677952) zero_vruntime(19756286051) sum_shift(0) avg_vruntime(19756286051)
This is definitely weird; so all these tasks should be more or less
equally spread out around avg_runtime with a +- of that lag bound. This
means that sum_w_vruntime should be in the order of walltime-delta.
To see this; let us remind that:
dt_i
dv_i = ----
w_i
dt
dV = -- ; where: W = \Sum w_i and dt = \Sum dt_i
W
(Virtual) lag is then defined as the difference between V and v_i. In
the fluid model the lag is 0 -- since everybody always advances equally.
In the discrete model this is translated to \Sum lag_i := 0. Anyway, it
can be shown that \Sum vlag_i := 0, is equivalent to:
\Sum w_i * v_i
V = --------------
W
In differential form that gives:
dt_i
\Sum w_i * ----
w_i \Sum dt_i dt
dV = ---------------- = --------- = --
W W W
Now: sum_w_vruntime := dt-dt_curr, sum_weight := W-w_curr
[ one way of looking at it is that sum_w_vruntime + curr->vruntime
carries the remainder of the division, while zero_vruntime carries whe
whole part ]
Anyway, your trace shows both zero_vruntime and avg_vruntime increasing,
this means dt is positive. However, at the same time it shows
sum_w_vruntime being increasingly negative.
The only way this can be is for curr->vruntime to be increasinly
positive such that the sum ends up being a 'small' positive number.
IOW, we're not running the right tasks (and wrecking the lag bounds in
the process).
>
> # I'm suspecting something goes sideways at this point looking at
> # the big jump that comes after in avg_vruntime()
> # "6222537296247259136" has bit 63 set so could it be a wraparound
> # in sum_w_vruntime?
>
> Enqueue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(6222537296247259136) sum_weight(2152726528) zero_vruntime(24024889432) sum_shift(0) avg_vruntime(24024889432)
> Dequeue cfs_rq: depth(1) weight(2152726528) nr_queued(2053) sum_w_vruntime(-5928597400870453248) sum_weight(2151677952) zero_vruntime(21110281285) sum_shift(0) avg_vruntime(21110281285)
>
> cfs_rq of failed pick:
> cfs_rq: depth(0) weight(2176843776) nr_queued(2076) sum_w_vruntime(-90907067772043264) sum_weight(2175795200) zero_vruntime(26921355273)
> se: weight(1048576) vruntime(843832351) slice(2800000) deadline(846630448) curr?(1) task?(1) delayed?(0) se_depth(1)
> se: weight(1048576) vruntime(839841550) slice(2800000) deadline(842635020) curr?(0) task?(1) delayed?(0) se_depth(1)
> ...
>
> # Many entities have weight 1048576, and and vruntime around ~850,000
>
> ....
> se: weight(1048576) vruntime(843832916) slice(2800000) deadline(846629681) curr?(0) task?(1) delayed?(0) se_depth(1)
> se: weight(1048576) vruntime(843833563) slice(2800000) deadline(846630939) curr?(0) task?(1) delayed?(0) se_depth(1)
> se: weight(1048576) vruntime(843840684) slice(2800000) deadline(846633192) curr?(0) task?(1) delayed?(0) se_depth(1)
> se: weight(1048576) vruntime(18344670326) slice(2800000) deadline(18347465508) curr?(0) task?(1) delayed?(0) se_depth(1)
> se: weight(1048576) vruntime(18344679852) slice(2800000) deadline(18347475866) curr?(0) task?(1) delayed?(0) se_depth(1)
> se: weight(1048576) vruntime(18344682061) slice(2800000) deadline(18347477764) curr?(0) task?(1) delayed?(0) se_depth(1)
> ...
>
> # Many entities have weight 1048576, and and vruntime around ~18,344,682,061
>
>
> I'm running with CONFIG_HZ=250. In vruntime_eligible() we have for curr:
>
> entity_key(curr) = -26077522922LL
> weight = 1048576UL
>
>
> For the cfs_rq we get:
>
> avg = sum_w_runtime + (entity_key * weight) = -118251332447502336LL
> load = sum_weight + weight = 2176843776UL
>
>
> But on the way to check eligibility we compute:
>
> entity_key * load = -56766693466253033472 (in python)
> entity_key * load = -1426461245124378624LL (in C)
>
>
> vruntime_eligible() returns false always as a result of the overflow and
> we land in a pickle. Not sure if sum_w_vruntime itself can suffer from
> a wrap around that leads to all this.
>
> Parsing the stats based on the dump in Python gives me:
>
> Total weight: 2176843776 (checks out)
> Total weighted vruntime: 3145101113938673664
>
> Avg (floating point): 1444798725.849711
> Avg (signed 64-bit): 1444798725
> Avg (unsigned 64-bit): 1444798725
>
> which is a bit far off from the dumped stats of cfs_rq.
So eligibility is lag > 0, or v_i < V. Thus we have:
v_i < V_0 + dt/W
Because divisions are expensive, we've rearranged things:
(v_i - V_0) < dt/W
(v_i - V_0) * W < dt
Now, (v_i - V_0) is entity_key() and we've argued that:
(v_i - V_0) * w_i ~ 44 bits
But now we do * W, which is n*w_i (assuming, as is the case here that
all our tasks of equal weight). Still this would allow n to be of the
order of 20 bits, far larger than the 2k it is.
But yes, if (v_i - V_0) far exceeds the limits imposed by the lag
bounds, this will go sideways.
Let me go puzzle...
For you, slice+TICK_NSEC should be something like: 6800000, and given
everything is weight '1', we would expect vruntime to always be:
avg_vruntime +- 6800000
But that is clearly not happening.
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 11:59 ` Peter Zijlstra
@ 2026-02-12 17:16 ` Peter Zijlstra
2026-02-12 17:24 ` Vincent Guittot
2026-02-12 19:29 ` Peter Zijlstra
0 siblings, 2 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-12 17:16 UTC (permalink / raw)
To: K Prateek Nayak
Cc: Vincent Guittot, Doug Smythies, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Thu, Feb 12, 2026 at 12:59:43PM +0100, Peter Zijlstra wrote:
> On Thu, Feb 12, 2026 at 01:13:30PM +0530, K Prateek Nayak wrote:
> > Enqueue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(18343811230990336) sum_weight(2144337920) zero_vruntime(18337852274) sum_shift(0) avg_vruntime(18337852274)
> > Dequeue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(1303379968) sum_weight(2143289344) zero_vruntime(18354971669) sum_shift(0) avg_vruntime(18354971669)
After staring at waaay too many traces of my own, which confirm what
you're seeing, but didn't want to make any sense either...
... I thinks I found it ...
Note that sum_weight, that has _just_ flipped bit 31 and thus turned
negative *if* it were a 32bit number. Every time, exactly at this point
things started to go sideways.
So I went looking for where this might be and I found the below.
My latest run has passed 0x8000000/(1024*1024) = 2048 tasks and is still
running. Numbers are still sane, fingers crossed.
---
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5b1a2abb727e..de155be02411 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -797,7 +797,11 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
if (runtime < 0)
runtime -= (weight - 1);
+#ifndef CONFIG_64BIT
delta = div_s64(runtime, weight);
+#else
+ delta = runtime / weight;
+#endif
} else if (curr) {
/*
* When there is but one element, it is the average.
^ permalink raw reply related [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 17:16 ` Peter Zijlstra
@ 2026-02-12 17:24 ` Vincent Guittot
2026-02-12 19:31 ` Peter Zijlstra
2026-02-12 19:29 ` Peter Zijlstra
1 sibling, 1 reply; 70+ messages in thread
From: Vincent Guittot @ 2026-02-12 17:24 UTC (permalink / raw)
To: Peter Zijlstra
Cc: K Prateek Nayak, Doug Smythies, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Thu, 12 Feb 2026 at 18:16, Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Thu, Feb 12, 2026 at 12:59:43PM +0100, Peter Zijlstra wrote:
> > On Thu, Feb 12, 2026 at 01:13:30PM +0530, K Prateek Nayak wrote:
>
> > > Enqueue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(18343811230990336) sum_weight(2144337920) zero_vruntime(18337852274) sum_shift(0) avg_vruntime(18337852274)
> > > Dequeue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(1303379968) sum_weight(2143289344) zero_vruntime(18354971669) sum_shift(0) avg_vruntime(18354971669)
>
> After staring at waaay too many traces of my own, which confirm what
> you're seeing, but didn't want to make any sense either...
>
> ... I thinks I found it ...
>
> Note that sum_weight, that has _just_ flipped bit 31 and thus turned
> negative *if* it were a 32bit number. Every time, exactly at this point
> things started to go sideways.
>
> So I went looking for where this might be and I found the below.
>
> My latest run has passed 0x8000000/(1024*1024) = 2048 tasks and is still
> running. Numbers are still sane, fingers crossed.
>
>
> ---
>
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 5b1a2abb727e..de155be02411 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -797,7 +797,11 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
> if (runtime < 0)
> runtime -= (weight - 1);
>
> +#ifndef CONFIG_64BIT
> delta = div_s64(runtime, weight);
> +#else
> + delta = runtime / weight;
> +#endif
Good catch
Don't we have the same problem with the div_s64 in place_entity ?
> } else if (curr) {
> /*
> * When there is but one element, it is the average.
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 17:24 ` Vincent Guittot
@ 2026-02-12 19:31 ` Peter Zijlstra
2026-02-13 5:22 ` K Prateek Nayak
0 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-12 19:31 UTC (permalink / raw)
To: Vincent Guittot
Cc: K Prateek Nayak, Doug Smythies, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Thu, Feb 12, 2026 at 06:24:27PM +0100, Vincent Guittot wrote:
> > diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> > index 5b1a2abb727e..de155be02411 100644
> > --- a/kernel/sched/fair.c
> > +++ b/kernel/sched/fair.c
> > @@ -797,7 +797,11 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
> > if (runtime < 0)
> > runtime -= (weight - 1);
> >
> > +#ifndef CONFIG_64BIT
> > delta = div_s64(runtime, weight);
> > +#else
> > + delta = runtime / weight;
> > +#endif
>
> Good catch
>
> Don't we have the same problem with the div_s64 in place_entity ?
Indeed so. Let me go fix both and push out a new set. I'll post all the
patches tomorrow once the robot has blessed them.
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 19:31 ` Peter Zijlstra
@ 2026-02-13 5:22 ` K Prateek Nayak
2026-02-13 6:44 ` Peter Zijlstra
0 siblings, 1 reply; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-13 5:22 UTC (permalink / raw)
To: Peter Zijlstra, Vincent Guittot
Cc: Doug Smythies, mingo, juri.lelli, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel
On 2/13/2026 1:01 AM, Peter Zijlstra wrote:
> On Thu, Feb 12, 2026 at 06:24:27PM +0100, Vincent Guittot wrote:
>
>>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>>> index 5b1a2abb727e..de155be02411 100644
>>> --- a/kernel/sched/fair.c
>>> +++ b/kernel/sched/fair.c
>>> @@ -797,7 +797,11 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
>>> if (runtime < 0)
>>> runtime -= (weight - 1);
>>>
>>> +#ifndef CONFIG_64BIT
>>> delta = div_s64(runtime, weight);
>>> +#else
>>> + delta = runtime / weight;
>>> +#endif
>>
>> Good catch
>>
>> Don't we have the same problem with the div_s64 in place_entity ?
>
> Indeed so. Let me go fix both and push out a new set. I'll post all the
> patches tomorrow once the robot has blessed them.
rescale_entity() adds a bunch more of those. Don't those need changing
too? (I'm looking at the current sched/core at b4d41dc4bf30). And a
wrapper around this pattern would be much appreciated with the amount
of ifdeffry that gets added
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-13 5:22 ` K Prateek Nayak
@ 2026-02-13 6:44 ` Peter Zijlstra
2026-02-13 10:50 ` Peter Zijlstra
0 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-13 6:44 UTC (permalink / raw)
To: K Prateek Nayak
Cc: Vincent Guittot, Doug Smythies, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Fri, Feb 13, 2026 at 10:52:38AM +0530, K Prateek Nayak wrote:
> On 2/13/2026 1:01 AM, Peter Zijlstra wrote:
> > On Thu, Feb 12, 2026 at 06:24:27PM +0100, Vincent Guittot wrote:
> >
> >>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> >>> index 5b1a2abb727e..de155be02411 100644
> >>> --- a/kernel/sched/fair.c
> >>> +++ b/kernel/sched/fair.c
> >>> @@ -797,7 +797,11 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
> >>> if (runtime < 0)
> >>> runtime -= (weight - 1);
> >>>
> >>> +#ifndef CONFIG_64BIT
> >>> delta = div_s64(runtime, weight);
> >>> +#else
> >>> + delta = runtime / weight;
> >>> +#endif
> >>
> >> Good catch
> >>
> >> Don't we have the same problem with the div_s64 in place_entity ?
> >
> > Indeed so. Let me go fix both and push out a new set. I'll post all the
> > patches tomorrow once the robot has blessed them.
>
> rescale_entity() adds a bunch more of those. Don't those need changing
> too? (I'm looking at the current sched/core at b4d41dc4bf30). And a
> wrapper around this pattern would be much appreciated with the amount
> of ifdeffry that gets added
rescale_entity() should be okay, that's just a single entity and not a
weight sum.
As to wrapper, I just went through math64.h and it appears we have
div64_long() that might just DTRT, but I really need to go wake up
first.
And as you noted, the current branch doesn't boot :/ No idea what I
messed up last night, but I did push without test building. I only
folded those two division fixed and figured what could possibly go wrong
:-)
Anyway, let me get the kids to school, have breakfast and I'll go figure
out WTF I messed up.
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-13 6:44 ` Peter Zijlstra
@ 2026-02-13 10:50 ` Peter Zijlstra
2026-02-13 14:29 ` K Prateek Nayak
2026-02-14 6:31 ` Doug Smythies
0 siblings, 2 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-13 10:50 UTC (permalink / raw)
To: K Prateek Nayak
Cc: Vincent Guittot, Doug Smythies, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Fri, Feb 13, 2026 at 07:44:24AM +0100, Peter Zijlstra wrote:
> As to wrapper, I just went through math64.h and it appears we have
> div64_long() that might just DTRT, but I really need to go wake up
> first.
>
> And as you noted, the current branch doesn't boot :/ No idea what I
> messed up last night, but I did push without test building. I only
> folded those two division fixed and figured what could possibly go wrong
> :-)
It's now got div64_long() throughout.
I've build and booted each commit in a vm; build and booted the combined
stack on 2 different physical machines and re-ran the various
benchmarks.
Works-for-me.
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-13 10:50 ` Peter Zijlstra
@ 2026-02-13 14:29 ` K Prateek Nayak
2026-02-14 6:31 ` Doug Smythies
1 sibling, 0 replies; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-13 14:29 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Vincent Guittot, Doug Smythies, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On 2/13/2026 4:20 PM, Peter Zijlstra wrote:
> On Fri, Feb 13, 2026 at 07:44:24AM +0100, Peter Zijlstra wrote:
>> As to wrapper, I just went through math64.h and it appears we have
>> div64_long() that might just DTRT, but I really need to go wake up
>> first.
>>
>> And as you noted, the current branch doesn't boot :/ No idea what I
>> messed up last night, but I did push without test building. I only
>> folded those two division fixed and figured what could possibly go wrong
>> :-)
>
> It's now got div64_long() throughout.
>
> I've build and booted each commit in a vm; build and booted the combined
> stack on 2 different physical machines and re-ran the various
> benchmarks.
>
> Works-for-me.
Booted fine on this side as well. Will take it for a spin with the usual
set of tests and report back with the results.
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread
* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-13 10:50 ` Peter Zijlstra
2026-02-13 14:29 ` K Prateek Nayak
@ 2026-02-14 6:31 ` Doug Smythies
2026-02-21 22:51 ` Doug Smythies
1 sibling, 1 reply; 70+ messages in thread
From: Doug Smythies @ 2026-02-14 6:31 UTC (permalink / raw)
To: 'Peter Zijlstra', 'K Prateek Nayak'
Cc: 'Vincent Guittot', mingo, juri.lelli, dietmar.eggemann,
rostedt, bsegall, mgorman, vschneid, linux-kernel, wangtao554,
quzicheng, Doug Smythies
[-- Attachment #1: Type: text/plain, Size: 3445 bytes --]
On 2026.02.13 02:50 Peter Zijlstra wrote:
> On Fri, Feb 13, 2026 at 07:44:24AM +0100, Peter Zijlstra wrote:
>> As to wrapper, I just went through math64.h and it appears we have
>> div64_long() that might just DTRT, but I really need to go wake up
>> first.
>>
>> And as you noted, the current branch doesn't boot :/ No idea what I
>> messed up last night, but I did push without test building. I only
>> folded those two division fixed and figured what could possibly go wrong
>> :-)
>
> It's now got div64_long() throughout.
>
> I've build and booted each commit in a vm; build and booted the combined
> stack on 2 different physical machines and re-ran the various
> benchmarks.
>
> Works-for-me.
Works for me also.
Note: I am calling this "V5" (version 5).
But: please consider if there is an issue or not with test 3 below,
mainly detailed in the attached graphs.
Testing order was from least to most time consuming.
1.) Phoronix version of hackbench, same settings as my previous reports:
Run 1 of 2, 10 tests per run: Average: 22.685 Seconds; Deviation: 0.27%
Run 2 of 2, 10 tests per run: Average: 22.775 Seconds; Deviation: 0.24%
Conclusion: Pass.
2.) a ridiculous number of threads test. Each thread mostly sleeps.
Note 1: Not previously mentioned, but I have been doing this test for years, just to see if it works.
Note 2: Other default limits need to be increased for this test. Example:
doug@s19:~$ cat /sys/fs/cgroup/user.slice/user-1000.slice/pids.max
84080
doug@s19:~$ echo 400000 | sudo tee /sys/fs/cgroup/user.slice/user-1000.slice/pids.max
400000
doug@s19:~$ cat /sys/fs/cgroup/user.slice/user-1000.slice/pids.max
400000
Note 3: The maximum number of threads attempted is determined by the amount of system memory.
In my case the memory limit is around 220,000 threads.
Note 4: There never was an issue with this test, even for previous versions of this patch set.
Details:
doug@s19:~$ cat /sys/fs/cgroup/user.slice/user-1000.slice/pids.current
220015
doug@s19:~$ uptime
08:22:23 up 26 min, 4 users, load average: 0.99, 15.19, 36.38
doug@s19:~$ free -m
total used free shared buff/cache available
Mem: 31928 28767 2985 5 568 3161
Swap: 8191 0 8191
Conclusion: Pass.
3.) a ridiculous load. Each thread is 100% load, no sleep. 20,000 X yes:
Conclusion: Pass?
Observation: The spin out rate of tasks is "clunky" not smooth. It used to be smooth.
A couple of graphs are attached. Note that actual sample times are now used,
after a nominal sleep of 2 seconds between samples. Sometimes the actual
gap is over 1 minute. It takes considerably longer, 2,200 seconds verses
1,309 seconds to spin out the 20,000 takes for V5 verses kernel 6.19-rc8.
4.) Back to the original complaint from a year ago [1]: With a ridiculous load, is there a big delay for SSH login?
Note 1: I don't care either way, I just tried it.
Details: SSH login times were all between 6 and 8 seconds.
Conclusion: Pass.
5.) Under 100.0% load (in my case 12 X yes) are there unreasonably long times between samples for turbostat?
Histograms (3 hours and 39 minutes test run time):
Peter's cool way:
$ gawk '/^usec/ {next} { if (T) { d=$2-T; bucket[int(d*1000)]++; } T=$2 } END { for (i in bucket) { printf "%0.3f: %d\n", i/1000,
bucket[i] }}' < /dev/shm/turbo.log
1.000: 6870
1.001: 5647
1.002: 25
1.003: 6
1.005: 1
My old way: Not done.
[1] https://lore.kernel.org/lkml/002401dbb6bd$4527ec00$cf77c400$@telus.net/
[-- Attachment #2: pz-task-sample-gaps.png --]
[-- Type: image/png, Size: 20694 bytes --]
[-- Attachment #3: pz-task-rate.png --]
[-- Type: image/png, Size: 24313 bytes --]
^ permalink raw reply [flat|nested] 70+ messages in thread* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-14 6:31 ` Doug Smythies
@ 2026-02-21 22:51 ` Doug Smythies
0 siblings, 0 replies; 70+ messages in thread
From: Doug Smythies @ 2026-02-21 22:51 UTC (permalink / raw)
To: 'Peter Zijlstra', 'K Prateek Nayak'
Cc: 'Vincent Guittot', mingo, juri.lelli, dietmar.eggemann,
rostedt, bsegall, mgorman, vschneid, linux-kernel, wangtao554,
quzicheng, Doug Smythies
On 2026.02.13 22:31 Doug Smythies wrote:
> On 2026.02.13 02:50 Peter Zijlstra wrote:
>> On Fri, Feb 13, 2026 at 07:44:24AM +0100, Peter Zijlstra wrote:
>>> As to wrapper, I just went through math64.h and it appears we have
>>> div64_long() that might just DTRT, but I really need to go wake up
>>> first.
>>>
>>> And as you noted, the current branch doesn't boot :/ No idea what I
>>> messed up last night, but I did push without test building. I only
>>> folded those two division fixed and figured what could possibly go wrong
>>> :-)
>>
>> It's now got div64_long() throughout.
>>
>> I've build and booted each commit in a vm; build and booted the combined
>> stack on 2 different physical machines and re-ran the various
>> benchmarks.
>>
>> Works-for-me.
>
> Works for me also.
>
> Note: I am calling this "V5" (version 5).
>
> But: please consider if there is an issue or not with test 3 below,
> mainly detailed in the attached graphs.
... snip ...
> 3.) a ridiculous load. Each thread is 100% load, no sleep. 20,000 X yes:
> Conclusion: Pass?
> Observation: The spin out rate of tasks is "clunky" not smooth. It used to be smooth.
> A couple of graphs are attached. Note that actual sample times are now used,
> after a nominal sleep of 2 seconds between samples. Sometimes the actual
> gap is over 1 minute. It takes considerably longer, 2,200 seconds verses
> 1,309 seconds to spin out the 20,000 takes for V5 verses kernel 6.19-rc8.
Just a follow up:
The above reported concern with this test never had anything to do with this
patch series. It had everything to do with commit 7dadeaa6e851:
sched: Further restrict the preemption modes
and my use of the Ubuntu kernel configuration. In the header of the commit
it says:
While Lazy has been the recommended setting for a while,
not all distributions have managed to make the switch yet.
Force things along.
The kernel configuration was automatically modified eliminating
PREEMPT_VOLUNTARY and leaving PREEMPT_LAZY disabled.
Once I set PREEMPT_LAZY the above noted concern was gone
(although I am still testing).
References:
https://lore.kernel.org/all/20251219101502.GB1132199@noisy.programming.kicks-ass.net/
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 17:16 ` Peter Zijlstra
2026-02-12 17:24 ` Vincent Guittot
@ 2026-02-12 19:29 ` Peter Zijlstra
2026-02-12 19:37 ` Doug Smythies
2026-02-13 6:04 ` K Prateek Nayak
1 sibling, 2 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-12 19:29 UTC (permalink / raw)
To: K Prateek Nayak
Cc: Vincent Guittot, Doug Smythies, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Thu, Feb 12, 2026 at 06:16:11PM +0100, Peter Zijlstra wrote:
> On Thu, Feb 12, 2026 at 12:59:43PM +0100, Peter Zijlstra wrote:
> > On Thu, Feb 12, 2026 at 01:13:30PM +0530, K Prateek Nayak wrote:
>
> > > Enqueue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(18343811230990336) sum_weight(2144337920) zero_vruntime(18337852274) sum_shift(0) avg_vruntime(18337852274)
> > > Dequeue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(1303379968) sum_weight(2143289344) zero_vruntime(18354971669) sum_shift(0) avg_vruntime(18354971669)
>
> After staring at waaay too many traces of my own, which confirm what
> you're seeing, but didn't want to make any sense either...
>
> ... I thinks I found it ...
>
> Note that sum_weight, that has _just_ flipped bit 31 and thus turned
> negative *if* it were a 32bit number. Every time, exactly at this point
> things started to go sideways.
>
> So I went looking for where this might be and I found the below.
>
> My latest run has passed 0x8000000/(1024*1024) = 2048 tasks and is still
> running. Numbers are still sane, fingers crossed.
>
I made it all the way to 3k tasks on the one CPU and all is well.
^ permalink raw reply [flat|nested] 70+ messages in thread
* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 19:29 ` Peter Zijlstra
@ 2026-02-12 19:37 ` Doug Smythies
2026-02-13 6:04 ` K Prateek Nayak
1 sibling, 0 replies; 70+ messages in thread
From: Doug Smythies @ 2026-02-12 19:37 UTC (permalink / raw)
To: 'Peter Zijlstra', 'K Prateek Nayak'
Cc: 'Vincent Guittot', mingo, juri.lelli, dietmar.eggemann,
rostedt, bsegall, mgorman, vschneid, linux-kernel, wangtao554,
quzicheng, Doug Smythies
On 2026.02.12 11:29 Peter Zijlstra wrote:
> On Thu, Feb 12, 2026 at 06:16:11PM +0100, Peter Zijlstra wrote:
>> On Thu, Feb 12, 2026 at 12:59:43PM +0100, Peter Zijlstra wrote:
>>> On Thu, Feb 12, 2026 at 01:13:30PM +0530, K Prateek Nayak wrote:
>>
>>>> Enqueue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(18343811230990336) sum_weight(2144337920)
zero_vruntime(18337852274) sum_shift(0) avg_vruntime(18337852274)
>>>> Dequeue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(1303379968) sum_weight(2143289344)
zero_vruntime(18354971669) sum_shift(0) avg_vruntime(18354971669)
>>
>> After staring at waaay too many traces of my own, which confirm what
>> you're seeing, but didn't want to make any sense either...
>>
>> ... I thinks I found it ...
>>
>> Note that sum_weight, that has _just_ flipped bit 31 and thus turned
>> negative *if* it were a 32bit number. Every time, exactly at this point
>> things started to go sideways.
>>
>> So I went looking for where this might be and I found the below.
>>
>> My latest run has passed 0x8000000/(1024*1024) = 2048 tasks and is still
>> running. Numbers are still sane, fingers crossed.
>>
>
> I made it all the way to 3k tasks on the one CPU and all is well.
I got to the full 20,000 X yes tasks on my test computer. All good.
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 19:29 ` Peter Zijlstra
2026-02-12 19:37 ` Doug Smythies
@ 2026-02-13 6:04 ` K Prateek Nayak
1 sibling, 0 replies; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-13 6:04 UTC (permalink / raw)
To: Peter Zijlstra
Cc: Vincent Guittot, Doug Smythies, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
Hello Peter,
On 2/13/2026 12:59 AM, Peter Zijlstra wrote:
> On Thu, Feb 12, 2026 at 06:16:11PM +0100, Peter Zijlstra wrote:
>> On Thu, Feb 12, 2026 at 12:59:43PM +0100, Peter Zijlstra wrote:
>>> On Thu, Feb 12, 2026 at 01:13:30PM +0530, K Prateek Nayak wrote:
>>
>>>> Enqueue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(18343811230990336) sum_weight(2144337920) zero_vruntime(18337852274) sum_shift(0) avg_vruntime(18337852274)
>>>> Dequeue cfs_rq: depth(1) weight(2144337920) nr_queued(2045) sum_w_vruntime(1303379968) sum_weight(2143289344) zero_vruntime(18354971669) sum_shift(0) avg_vruntime(18354971669)
>>
>> After staring at waaay too many traces of my own, which confirm what
>> you're seeing, but didn't want to make any sense either...
>>
>> ... I thinks I found it ...
>>
>> Note that sum_weight, that has _just_ flipped bit 31 and thus turned
>> negative *if* it were a 32bit number. Every time, exactly at this point
>> things started to go sideways.
>>
>> So I went looking for where this might be and I found the below.
>>
>> My latest run has passed 0x8000000/(1024*1024) = 2048 tasks and is still
>> running. Numbers are still sane, fingers crossed.
>>
>
> I made it all the way to 3k tasks on the one CPU and all is well.
So the current peterz:sched/core refused to boot to prompt for (hopefully
it is just you forgetting to push out the latest branch ;-)
I have the following situation:
Pick failed to find eligible entities. Dumping cfs_rq
cfs_rq: depth(0) weight(3145728) nr_queued(3) sum_w_vruntime(-3074459814163644416) sum_weight(3145728) zero_vruntime(18446688365342623754) sum_shift(0)
cfs_rq after avg_vruntime(): sum_w_vruntime(1048576) sum_weight(3145728) zero_vruntime(18446687387998169890) avg_vruntime(18446687387998169890)
se: weight(1048576) vruntime(18446691297375985345) slice(700000) deadline(18446691297376644150) curr?(1) task?(1) se_depth(0) eligible?(1)
se: weight(1048576) vruntime(18446682501282949076) slice(700000) deadline(18446682501283649076) curr?(0) task?(1) se_depth(0) eligible?(0)
se: weight(1048576) vruntime(18446688365342622487) slice(700000) deadline(18446688365342972487) curr?(0) task?(1) se_depth(0) eligible?(0)
se: weight(1048576) vruntime(18446691297368938108) slice(700000) deadline(18446691297369619108) curr?(0) task?(1) se_depth(0) eligible?(1)
Note: sum_w_vruntime grows pretty large before but on calling
avg_vruntime(), things are back to normal.
Since this is so early into the boot I traced the heck out of
it and one of the observation was how the sum_weight() keeps
growing from the initial zero_vruntime:
Legend: '|' is a place_entity(), "->" is enqueue, "<-" is dequeue.
If the line contains "*" it is "before" the action.
Without the "*" is "after" the action.
Line with only "cfs_rq" line before and after avg_vruntime() in entity_tick()
vruntime: CPU(0) se vruntime(18446744073708503040) vlag(0) deadline(0) | cfs_rq sum_w_vruntime(0) sum_weight(0) zero_vruntime(18446744073708503040)
vruntime: CPU(0) *se vruntime(18446744073708503040) vlag(0) deadline(18446744073708853040) -> cfs_rq sum_w_vruntime(0) sum_weight(0) zero_vruntime(18446744073708503040)
vruntime: CPU(0) se vruntime(18446744073708503040) vlag(0) deadline(18446744073708853040) -> cfs_rq sum_w_vruntime(0) sum_weight(1048576) zero_vruntime(18446744073708503040)
vruntime: CPU(0) se vruntime(18446744073708503040) vlag(0) deadline(0) | cfs_rq sum_w_vruntime(0) sum_weight(1048576) zero_vruntime(18446744073708503040)
vruntime: CPU(0) *se vruntime(18446744073708503040) vlag(0) deadline(18446744073708853040) -> cfs_rq sum_w_vruntime(0) sum_weight(1048576) zero_vruntime(18446744073708503040)
vruntime: CPU(0) se vruntime(18446744073708503040) vlag(0) deadline(18446744073708853040) -> cfs_rq sum_w_vruntime(0) sum_weight(2097152) zero_vruntime(18446744073708503040)
vruntime: CPU(0) *se vruntime(18446744073708503040) vlag(0) deadline(18446744073708853040) <- cfs_rq sum_w_vruntime(0) sum_weight(2097152) zero_vruntime(18446744073708503040)
vruntime: CPU(0) se vruntime(18446744073708503040) vlag(0) deadline(18446744073708853040) <- cfs_rq sum_w_vruntime(0) sum_weight(1048576) zero_vruntime(18446744073708503040)
vruntime: CPU(0) *cfs_rq: cfs_rq sum_w_vruntime(0) sum_weight(1048576) zero_vruntime(18446744073708503040)
At this point:
curr->vruntime = 951329; /* should be same as computed avg */
u64 zero_vruntime = (u64)(-1048576LL); /* From init */
s64 sum_w_vruntime = 0;
s64 delta = curr->vruntime - cfs_rq->zero_vruntime = 1999905; /* Net positive. */
sum_w_vruntime -= 1999905 * sum_weight;
sum_w_vruntime = -2097052385280; /* Checks out! */
vruntime: CPU(0) cfs_rq: cfs_rq sum_w_vruntime(-2097052385280) sum_weight(1048576) zero_vruntime(951329) avg_vruntime(951329)
After this point all delta are positive and we keep
subtracting from sum_w_vruntime.
vruntime: CPU(0) *cfs_rq: cfs_rq sum_w_vruntime(-2097052385280) sum_weight(1048576) zero_vruntime(951329)
vruntime: CPU(0) cfs_rq: cfs_rq sum_w_vruntime(-4194182365184) sum_weight(1048576) zero_vruntime(2951308) avg_vruntime(2951308)
vruntime: CPU(0) *cfs_rq: cfs_rq sum_w_vruntime(-4194182365184) sum_weight(1048576) zero_vruntime(2951308)
vruntime: CPU(0) cfs_rq: cfs_rq sum_w_vruntime(-6291298713600) sum_weight(1048576) zero_vruntime(4951274) avg_vruntime(4951274)
vruntime: CPU(0) *cfs_rq: cfs_rq sum_w_vruntime(-6291298713600) sum_weight(1048576) zero_vruntime(4951274)
vruntime: CPU(0) cfs_rq: cfs_rq sum_w_vruntime(-8388566056960) sum_weight(1048576) zero_vruntime(6951384) avg_vruntime(6951384)
vruntime: CPU(0) *cfs_rq: cfs_rq sum_w_vruntime(-8388566056960) sum_weight(1048576) zero_vruntime(6951384)
vruntime: CPU(0) cfs_rq: cfs_rq sum_w_vruntime(-10485571256320) sum_weight(1048576) zero_vruntime(8951244) avg_vruntime(8951244)
vruntime: CPU(0) *cfs_rq: cfs_rq sum_w_vruntime(-10485571256320) sum_weight(1048576) zero_vruntime(8951244)
vruntime: CPU(0) cfs_rq: cfs_rq sum_w_vruntime(-12582749470720) sum_weight(1048576) zero_vruntime(10951269) avg_vruntime(10951269)
vruntime: CPU(0) *cfs_rq: cfs_rq sum_w_vruntime(-12582749470720) sum_weight(1048576) zero_vruntime(10951269)
vruntime: CPU(0) cfs_rq: cfs_rq sum_w_vruntime(-14680032542720) sum_weight(1048576) zero_vruntime(12951394) avg_vruntime(12951394)
I still haven't found how we end up at a situation where avg_vruntime
is close to -56685711381726LL at the time of crash :-(
Will update if I find something.
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 10:48 ` Peter Zijlstra
2026-02-11 10:49 ` Peter Zijlstra
2026-02-11 11:15 ` Vincent Guittot
@ 2026-02-11 16:21 ` Peter Zijlstra
2026-02-12 5:54 ` Doug Smythies
2026-02-12 7:46 ` Peter Zijlstra
2026-02-11 23:25 ` Doug Smythies
3 siblings, 2 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-11 16:21 UTC (permalink / raw)
To: Vincent Guittot
Cc: Doug Smythies, K Prateek Nayak, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Wed, Feb 11, 2026 at 11:48:33AM +0100, Peter Zijlstra wrote:
> Now let me go check on that latency thing from Doug (although hopefully
> that was the same boo-boo).
Only ~3 hours so far, I'll let it run overnight.
So on my ADL with P-cores only (unplug the E things):
$ NR=`grep -c processor /proc/cpuinfo`; for ((i=0; i<$NR; i++)) do yes > /dev/null & done
$ turbostat --quiet --Summary --show Busy%,Bzy_MHz,IRQ,PkgWatt,PkgTmp,TSC_MHz,Time_Of_Day_Seconds,usec --interval 1 --out /dev/shm/turbo.log
$ gawk '/^usec/ {next} { if (T) { d=$2-T; bucket[int(d*1000)]++; } T=$2 } END { for (i in bucket) { printf "%0.3f: %d\n", i/1000, bucket[i] }}' < /dev/shm/turbo.log
1.000: 4943
1.001: 5000
1.002: 21
1.003: 10
1.004: 1
1.005: 1
Which seems to suggest things are looking better again.
^ permalink raw reply [flat|nested] 70+ messages in thread* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 16:21 ` Peter Zijlstra
@ 2026-02-12 5:54 ` Doug Smythies
2026-02-12 7:51 ` Peter Zijlstra
2026-02-12 7:46 ` Peter Zijlstra
1 sibling, 1 reply; 70+ messages in thread
From: Doug Smythies @ 2026-02-12 5:54 UTC (permalink / raw)
To: 'Peter Zijlstra', 'Vincent Guittot'
Cc: 'K Prateek Nayak', mingo, juri.lelli, dietmar.eggemann,
rostedt, bsegall, mgorman, vschneid, linux-kernel, wangtao554,
quzicheng, Doug Smythies
On 2026.02.11 08:22 Peter Zijlstra wrote:
> On Wed, Feb 11, 2026 at 11:48:33AM +0100, Peter Zijlstra wrote:
>
>> Now let me go check on that latency thing from Doug (although hopefully
>> that was the same boo-boo).
>
> Only ~3 hours so far, I'll let it run overnight.
>
> So on my ADL with P-cores only (unplug the E things):
>
> $ NR=`grep -c processor /proc/cpuinfo`; for ((i=0; i<$NR; i++)) do yes > /dev/null & done
> $ turbostat --quiet --Summary --show Busy%,Bzy_MHz,IRQ,PkgWatt,PkgTmp,TSC_MHz,Time_Of_Day_Seconds,usec --interval 1 --out
/dev/shm/turbo.log
>
> $ gawk '/^usec/ {next} { if (T) { d=$2-T; bucket[int(d*1000)]++; } T=$2 } END { for (i in bucket) { printf "%0.3f: %d\n", i/1000,
bucket[i] }}' < /dev/shm/turbo.log
> 1.000: 4943
> 1.001: 5000
> 1.002: 21
> 1.003: 10
> 1.004: 1
> 1.005: 1
>
> Which seems to suggest things are looking better again.
Same here, 6 hours and 20 minutes so far, and I'll leave it overnight:
By the way, thank you for the cool parsing and histogram command line.
$ gawk '/^usec/ {next} { if (T) { d=$2-T; bucket[int(d*1000)]++; } T=$2 } END { for (i in bucket) { printf "%0.3f: %d\n", i/1000,
bucket[i] }}' < /dev/shm/turbo.log
1.000: 12381
1.001: 10388
1.002: 32
1.003: 20
1.004: 9
1.005: 2
1.006: 2
System:
Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz, 6 cores 12 CPUs.
CPU frequency scaling driver: intel_pstate.
CPU frequency scaling governor: powersave.
HWP: enabled.
idle governor teo.
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 5:54 ` Doug Smythies
@ 2026-02-12 7:51 ` Peter Zijlstra
2026-02-12 15:47 ` Doug Smythies
0 siblings, 1 reply; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-12 7:51 UTC (permalink / raw)
To: Doug Smythies
Cc: 'Vincent Guittot', 'K Prateek Nayak', mingo,
juri.lelli, dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng
On Wed, Feb 11, 2026 at 09:54:40PM -0800, Doug Smythies wrote:
> Same here, 6 hours and 20 minutes so far, and I'll leave it overnight:
Excellent!
> By the way, thank you for the cool parsing and histogram command line.
No problem. I love awk :-) Its just small enough to re-learn by reading
the man page.
I always struggle with things like perl and python because I don't use
them enough to retain stuff, and then I'm left endlessly googling how
the heck things worked again. But awk fits in a single 'short' manpage.
^ permalink raw reply [flat|nested] 70+ messages in thread
* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-12 7:51 ` Peter Zijlstra
@ 2026-02-12 15:47 ` Doug Smythies
0 siblings, 0 replies; 70+ messages in thread
From: Doug Smythies @ 2026-02-12 15:47 UTC (permalink / raw)
To: 'Peter Zijlstra'
Cc: 'Vincent Guittot', 'K Prateek Nayak', mingo,
juri.lelli, dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, Doug Smythies
On 2026.02.11 23:52 Peter Zijlstra wrote:
> On Wed, Feb 11, 2026 at 09:54:40PM -0800, Doug Smythies wrote:
>
>> Same here, 6 hours and 20 minutes so far, and I'll leave it overnight:
>
> Excellent!
>
>> By the way, thank you for the cool parsing and histogram command line.
>
> No problem. I love awk :-) Its just small enough to re-learn by reading
> the man page.
>
> I always struggle with things like perl and python because I don't use
> them enough to retain stuff, and then I'm left endlessly googling how
> the heck things worked again. But awk fits in a single 'short' manpage.
We already know all is good, but just for completeness after overnight:
14 hours and 46 minutes:
Cool method:
$ gawk '/^usec/ {next} { if (T) { d=$2-T; bucket[int(d*1000)]++; } T=$2 } END { for (i in bucket) { printf "%0.3f: %d\n", i/1000,
bucket[i] }}' < /dev/shm/turbo.log
1.000: 28858
1.001: 24052
1.002: 87
1.003: 56
1.004: 31
1.005: 11
1.006: 8
1.008: 2
My old way. Interesting differences, likely due to subtle differences in subtracting 2 16 digit numbers:
cat v3.his
1.000, 32974
1.001, 20012
1.002, 86
1.003, 57
1.004, 31
1.005, 11
1.006, 8
1.008, 2
Total: 53181 : Total >= 10 mSec: 0 ( 0.00 percent)
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 16:21 ` Peter Zijlstra
2026-02-12 5:54 ` Doug Smythies
@ 2026-02-12 7:46 ` Peter Zijlstra
1 sibling, 0 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-12 7:46 UTC (permalink / raw)
To: Vincent Guittot
Cc: Doug Smythies, K Prateek Nayak, mingo, juri.lelli,
dietmar.eggemann, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel
On Wed, Feb 11, 2026 at 05:21:49PM +0100, Peter Zijlstra wrote:
> On Wed, Feb 11, 2026 at 11:48:33AM +0100, Peter Zijlstra wrote:
>
> > Now let me go check on that latency thing from Doug (although hopefully
> > that was the same boo-boo).
>
> Only ~3 hours so far, I'll let it run overnight.
>
> So on my ADL with P-cores only (unplug the E things):
>
> $ NR=`grep -c processor /proc/cpuinfo`; for ((i=0; i<$NR; i++)) do yes > /dev/null & done
> $ turbostat --quiet --Summary --show Busy%,Bzy_MHz,IRQ,PkgWatt,PkgTmp,TSC_MHz,Time_Of_Day_Seconds,usec --interval 1 --out /dev/shm/turbo.log
>
> $ gawk '/^usec/ {next} { if (T) { d=$2-T; bucket[int(d*1000)]++; } T=$2 } END { for (i in bucket) { printf "%0.3f: %d\n", i/1000, bucket[i] }}' < /dev/shm/turbo.log
> 1.000: 4943
> 1.001: 5000
> 1.002: 21
> 1.003: 10
> 1.004: 1
> 1.005: 1
>
At 18+ hours:
1.000: 32458
1.001: 32973
1.002: 121
1.003: 63
1.004: 6
1.005: 2
I think we can consider this good :-) *phew*
^ permalink raw reply [flat|nested] 70+ messages in thread
* RE: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-11 10:48 ` Peter Zijlstra
` (2 preceding siblings ...)
2026-02-11 16:21 ` Peter Zijlstra
@ 2026-02-11 23:25 ` Doug Smythies
3 siblings, 0 replies; 70+ messages in thread
From: Doug Smythies @ 2026-02-11 23:25 UTC (permalink / raw)
To: 'Peter Zijlstra', 'Vincent Guittot'
Cc: 'K Prateek Nayak', mingo, juri.lelli, dietmar.eggemann,
rostedt, bsegall, mgorman, vschneid, linux-kernel, wangtao554,
quzicheng, Doug Smythies
On 2026.02.11 02:49 Peter Zijlstra wrote:
> On Wed, Feb 11, 2026 at 10:01:44AM +0100, Peter Zijlstra wrote:
>
>>> There 2 issues with patch 3
>>>
>>> *one scale_load_down remains in avg_vruntime
>>>
>>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>>> index 25c398ff0d59..3143ae7f07b0 100644
>>> --- a/kernel/sched/fair.c
>>> +++ b/kernel/sched/fair.c
>>> @@ -778,7 +778,7 @@ u64 avg_vruntime(struct cfs_rq *cfs_rq)
>>>
>>> if (weight) {
>>> if (curr) {
>>> - unsigned long w = scale_load_down(curr->load.weight);
>>> + unsigned long w =
>>> avg_vruntime_weight(curr->load.weight);
>>>
>>> runtime += entity_key(cfs_rq, curr) * w;
>>> weight += w;
>>
>> AAARGHHH!! Sorry about that, clearly I've not been careful with
>> reshuffling patches :-(
>
> So with that one fixed; I get (as queue/sched/core of just now):
>
... snip...
For the Phoronix version of hackbench I now get (I call this "V3"):
Run 1 of 2, 10 tests per run: 22.875 seconds average, Deviation 0.25%
Run 2 of 2, 10 tests per run: 22.979 seconds average, Deviation 0.16%
Test conditions same as yesterday for "V2" (was 85.755 seconds average, deviation 3.33%)
Processor Test Configuration 8 and "Process".
Conclusion: great.
> Now let me go check on that latency thing from Doug (although hopefully
> that was the same boo-boo).
I am starting that test now.
... Doug
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-10 20:52 ` Vincent Guittot
2026-02-11 5:21 ` Doug Smythies
@ 2026-02-11 8:48 ` Peter Zijlstra
1 sibling, 0 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-11 8:48 UTC (permalink / raw)
To: Vincent Guittot
Cc: K Prateek Nayak, mingo, juri.lelli, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
On Tue, Feb 10, 2026 at 09:52:29PM +0100, Vincent Guittot wrote:
> > Subject: sched/fair: Fix zero_vruntime tracking
> > From: Peter Zijlstra <peterz@infradead.org>
> > Date: Mon Feb 9 15:28:16 CET 2026
> >
> > It turns out that zero_vruntime tracking is broken when there is but a single
> > task running. Current update paths are through __{en,de}queue_entity(), and
> > when there is but a single task, pick_next_task() will always return that one
> > task, and put_prev_set_next_task() will end up in neither function.
> >
> > This can cause entity_key() to grow indefinitely large and cause overflows,
> > leading to much pain and suffering.
> >
> > Furtermore, doing update_zero_vruntime() from __{de,en}queue_entity(), which
> > are called from {set_next,put_prev}_entity() has problems because:
> >
> > - set_next_entity() calls __dequeue_entity() before it does cfs_rq->curr = se.
> > This means the avg_vruntime() will see the removal but not current, missing
> > the entity for accounting.
> >
> > - put_prev_entity() calls __enqueue_entity() before it does cfs_rq->curr =
> > NULL. This means the avg_vruntime() will see the addition *and* current,
> > leading to double accounting.
> >
> > Both cases are incorrect.
> >
> > Noting that avg_vruntime is already called on each {en,de}queue, remove the
> > explicit avg_vruntime() calls (which removes an extra 64bit division for each
> > {en,de}queue) and have avg_vruntime() update zero_vruntime itself.
> >
> > Additionally, have the tick call avg_vruntime() -- discarding the result, but
> > for the side-effect of updating zero_vruntime.
> >
> > While there, optimize avg_vruntime() by noting that the average of one value is
> > rather trivial to compute.
> >
> > Test case:
> > # taskset -c -p 1 $$
> > # taskset -c 2 bash -c 'while :; do :; done&'
> > # cat /sys/kernel/debug/sched/debug | awk '/^cpu#/ {P=0} /^cpu#2,/ {P=1} {if (P) print $0}' | grep -e zero_vruntime -e "^>"
> >
> > PRE:
> > .zero_vruntime : 31316.407903
> > >R bash 487 50787.345112 E 50789.145972 2.800000 50780.298364 16 120 0.000000 0.000000 0.000000 /
> > .zero_vruntime : 382548.253179
> > >R bash 487 427275.204288 E 427276.003584 2.800000 427268.157540 23 120 0.000000 0.000000 0.000000 /
> >
> > POST:
> > .zero_vruntime : 17259.709467
> > >R bash 526 17259.709467 E 17262.509467 2.800000 16915.031624 9 120 0.000000 0.000000 0.000000 /
> > .zero_vruntime : 18702.723356
> > >R bash 526 18702.723356 E 18705.523356 2.800000 18358.045513 9 120 0.000000 0.000000 0.000000 /
> >
> > Fixes: 79f3f9bedd14 ("sched/eevdf: Fix min_vruntime vs avg_vruntime")
> > Reported-by: K Prateek Nayak <kprateek.nayak@amd.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
>
> Hi Peter,
>
> This patch w/ the patchset on top of tip/sched/core create regressions
> for hackbench (tbench doesn't seem to be impacted) on my dragonboard
> rb5
Durr... That was obviously not so expected. Let me go poke.
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-03 12:19 ` K Prateek Nayak
2026-02-03 16:36 ` Doug Smythies
2026-02-04 10:15 ` K Prateek Nayak
@ 2026-02-04 10:44 ` Peter Zijlstra
2 siblings, 0 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-04 10:44 UTC (permalink / raw)
To: K Prateek Nayak
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
On Tue, Feb 03, 2026 at 05:49:16PM +0530, K Prateek Nayak wrote:
> > If any of the fields are !0, you tripped an overflow.
>
> Yup I see a few !0 values. Some inching closer to the BUG_ON()
>
> grep "shift.*: [^0]$" /sys/kernel/debug/sched/debug
> .sum_shift : 4
> .sum_shift : 3
> .sum_shift : 5
> .sum_shift : 1
> .sum_shift : 2
> .sum_shift : 3
Whee. Clearly I have some work to do ;-) I'll go prod at this.
Thanks!
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
` (5 preceding siblings ...)
2026-02-03 6:45 ` K Prateek Nayak
@ 2026-02-14 7:20 ` Shubhang Kaushik
2026-02-16 3:14 ` K Prateek Nayak
2026-02-17 4:20 ` K Prateek Nayak
2026-02-18 18:37 ` Shubhang Kaushik
8 siblings, 1 reply; 70+ messages in thread
From: Shubhang Kaushik @ 2026-02-14 7:20 UTC (permalink / raw)
To: Peter Zijlstra, mingo
Cc: juri.lelli, vincent.guittot, dietmar.eggemann, rostedt, bsegall,
mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies
[-- Attachment #1: Type: text/plain, Size: 6073 bytes --]
Hi Peter,
On Fri, 30 Jan 2026, Peter Zijlstra wrote:
> Two issues related to reweight_entity() were raised; poking at all that got me
> these patches.
>
> They're in queue.git/sched/core and I spend most of yesterday staring at traces
> trying to find anything wrong. So far, so good.
>
> Please test.
>
>
I’m seeing a consistent NULL pointer dereference in pick_task_fair() when
running hackbench on an Ampere Altra (80 cores arm64). This is happening
after applying the complete patchset on the latest 6.19.0+ kernel with
PREEMPT_DYNAMIC (full), CONFIG_SCHED_CLUSTER and NOHZ_FULL enabled.
The system triggers a level 2 translation fault because pick_eevdf()
returns NULL despite the runqueue having active tasks (cfs_rq->nr_running
> 0). When pick_next_task_fair() attempts to dereference this NULL pointer
to access the task structure, the kernel Oopses at
pick_task_fair+0x48/0x148.
pick_task_fair <- pick_eevdf() <- [active tasks]
The root cause is an underflow in reweight_entity():
se->vprot -= avruntime;
Under heavy load, the average runtime can sometimes be larger than the
protection time. Because these are unsigned numbers, the result wraps
around to a large value instead of becoming zero.
[ 1284.596683] Mem abort info: [ 1284.596684] ESR = 0x0000000096000006
[ 1284.596685] EC = 0x25: DABT (current EL), IL = 32 bits
[ 1284.596687] SET = 0, FnV = 0
[ 1284.596688] EA = 0, S1PTW = 0
[ 1284.596689] FSC = 0x06: level 2 translation fault
[ 1284.596690] Data abort info:
[ 1284.596690] ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000
[ 1284.596692] CM = 0, WnR = 0, TnD = 0, TagAccess = 0
[ 1284.596693] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[ 1284.596694] user pgtable: 4k pages, 48-bit VAs, pgdp=00000801917ee000
[ 1284.596695] [0000000000000051] pgd=08000801917ef403,
p4d=08000801917ef403, pud=08000801a6ed8403, pmd=0000000000000000
[ 1284.597314] Internal error: Oops: 0000000096000006 [#1] SMP
[ 1284.670270] Modules linked in: joydev rfkill mlx5_ib ib_uverbs ib_core
sunrpc binfmt_misc mlx5_core acpi_ipmi ipmi_ssif ipmi_devintf cdc_ether
mlxfw usbnet psample mii arm_spe_pmu tls ipmi_msghandler arm_cmn
arm_dmc620_pmu vfat fat arm_dsu_pmu cppc_cpufreq acpi_tad loop nfnetlink
zram xfs uas usb_storage ast ghash_ce sbsa_gwdt nvme i2c_algo_bit
nvme_core xgene_hwmon i2c_dev fuse
[ 1284.703809] CPU: 76 UID: 1000 PID: 17906 Comm: hackbench_bin Tainted: G
W 6.19.0+ #166 PREEMPT(full)
[ 1284.714492] Tainted: [W]=WARN
[ 1284.717447] Hardware name: WIWYNN Mt.Jade Server System
B81.03001.0014/Mt.Jade Motherboard, BIOS 2.10.20230517-1P (SCP:
2.10.20230517) 2023/05/17
[ 1284.730472] pstate: 004000c9 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS
BTYPE=--)
[ 1284.737420] pc : pick_task_fair+0x48/0x148
[ 1284.741508] lr : pick_task_fair+0x48/0x148
[ 1284.745592] sp : ffff8000f92337d0
[ 1284.748894] x29: ffff8000f92337d0 x28: ffff080094f01f00 x27:
ffff08012dc43300
[ 1284.756017] x26: ffff0801298189f0 x25: ffff63d900a14000 x24:
0000000000000001
[ 1284.763140] x23: ffff080129818000 x22: 0000000000000000 x21:
ffff083e61642e80
[ 1284.770263] x20: ffff083e61643000 x19: ffff083e61643000 x18:
0000000000000000
[ 1284.777385] x17: 0000000000000000 x16: 0000000000000000 x15:
ffff08011fc4f200
[ 1284.784508] x14: 000000000041fdf0 x13: 0000000000000004 x12:
0000000004aca7c0
[ 1284.791631] x11: ffffa4656247fa30 x10: ffffa46562818c48 x9 :
ffffa4655e0620c8
[ 1284.798754] x8 : 0000000000000001 x7 : 0000000000000002 x6 :
0000000000000002
[ 1284.805877] x5 : 000000000000000b x4 : 00000000057ae40b x3 :
fff73c190d1b5a9c
[ 1284.813000] x2 : 0000002f3f70fd54 x1 : 02eb323b0f008a9a x0 :
0000000000000000
[ 1284.820124] Call trace:
[ 1284.822558] pick_task_fair+0x48/0x148 (P)
[ 1284.826643] pick_next_task_fair+0x34/0x250
[ 1284.830815] __pick_next_task+0x4c/0x260
[ 1284.834727] pick_next_task+0x40/0xb68
[ 1284.838463] __schedule+0x184/0x790
[ 1284.841942] preempt_schedule_common+0x28/0x50
[ 1284.846374] dynamic_preempt_schedule+0x30/0x40
[ 1284.850893] kfree+0x2e8/0x448
[ 1284.853936] skb_free_head+0x54/0xc0
[ 1284.857501] skb_release_data+0x164/0x230
[ 1284.861499] consume_skb+0x78/0x1b0
[ 1284.864975] unix_stream_read_generic+0x818/0x950
[ 1284.869668] unix_stream_recvmsg+0xa4/0xc0
[ 1284.873753] sock_recvmsg+0x78/0xd0
[ 1284.877230] sock_read_iter+0xa4/0x118
[ 1284.880967] new_sync_read+0x18c/0x1b8
[ 1284.884704] vfs_read+0x1a4/0x200
[ 1284.888006] ksys_read+0xf4/0x118
[ 1284.891308] __arm64_sys_read+0x24/0x40
[ 1284.895132] invoke_syscall+0x6c/0x100
[ 1284.898869] el0_svc_common.constprop.0+0x48/0xf0
[ 1284.903561] do_el0_svc+0x24/0x38
[ 1284.906864] el0_svc+0x54/0x2f0
[ 1284.909993] el0t_64_sync_handler+0xa0/0xe8
[ 1284.914164] el0t_64_sync+0x19c/0x1a0
[ 1284.917815] Code: d503201f 52800021 aa1303e0 97ffab6f (39414401)
I was able to fix this by preventing the underflow in reweight_entity()
and resetting the state in set_next_entity().
By using time_after64(), I cap the value at 0 instead of letting it wrap
to a large number. I also added a reset (se->vprot = se->vruntime) to
ensure the protection state stays synchronized with actual progress,
clearing out any mismatch from the reweighting phase.
a/kernel/sched/fair.c +++ b/kernel/sched/fair.c
@@ -3972,7 +3972,7 @@ static void reweight_entity(struct cfs_rq *cfs_rq,
struct sched_entity *se,
se->deadline -= avruntime;
se->rel_deadline = 1;
if (curr && protect_slice(se)) {
- se->vprot -= avruntime;
+ se->vprot = (time_after64(se->vprot, avruntime)) ?
se->vprot - avruntime : 0;
rel_vprot = true;
}
@@ -5608,6 +5608,8 @@ set_next_entity(struct cfs_rq *cfs_rq, struct
sched_entity *se, bool first)
if (first)
set_protect_slice(cfs_rq, se);
+ else
+ se->vprot = se->vruntime;
}
Tested-by: Shubhang Kaushik <shubhang@os.amperecomputing.com>
Regards,
Shubhang Kaushik
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-14 7:20 ` Shubhang Kaushik
@ 2026-02-16 3:14 ` K Prateek Nayak
2026-02-16 10:59 ` Dietmar Eggemann
2026-02-17 22:02 ` Shubhang Kaushik
0 siblings, 2 replies; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-16 3:14 UTC (permalink / raw)
To: Shubhang Kaushik, Peter Zijlstra, mingo
Cc: juri.lelli, vincent.guittot, dietmar.eggemann, rostedt, bsegall,
mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
Hello Shubhang,
On 2/14/2026 12:50 PM, Shubhang Kaushik wrote:
> Hi Peter,
>
> On Fri, 30 Jan 2026, Peter Zijlstra wrote:
>
>> Two issues related to reweight_entity() were raised; poking at all that got me
>> these patches.
>>
>> They're in queue.git/sched/core and I spend most of yesterday staring at traces
>> trying to find anything wrong. So far, so good.
>>
>> Please test.
>>
>>
>
> I’m seeing a consistent NULL pointer dereference in pick_task_fair() when running hackbench on an Ampere Altra (80 cores arm64). This is happening after applying the complete patchset on the latest 6.19.0+ kernel with PREEMPT_DYNAMIC (full), CONFIG_SCHED_CLUSTER and NOHZ_FULL enabled.
Can you confirm you using the latest changes from:
git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core
at commit bdba3187771c ("sched/fair: Use full weight to __calc_delta()")
since this series has undergone some churn throughout the week?
>
> The system triggers a level 2 translation fault because pick_eevdf() returns NULL despite the runqueue having active tasks (cfs_rq->nr_running
>> 0). When pick_next_task_fair() attempts to dereference this NULL pointer
> to access the task structure, the kernel Oopses at pick_task_fair+0x48/0x148.
>
> pick_task_fair <- pick_eevdf() <- [active tasks]
>
> The root cause is an underflow in reweight_entity():
> se->vprot -= avruntime;
But how does it cause failure to pick? All vrpot does at pick is:
/* curr needs to be queued and eligible first. */
if (curr && (!curr->on_rq || !entity_eligible(cfs_rq, curr)))
curr = NULL;
/* vprot only helps for early return below. */
if (curr && protect && protect_slice(curr))
return curr;
Worst case "curr" runs till it loses eligibility even if vprot wraps
and becomes a large value and moreover, wouldn't vruntime_cmp() in
protect_slice() which compares the signed difference catch it?
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-16 3:14 ` K Prateek Nayak
@ 2026-02-16 10:59 ` Dietmar Eggemann
2026-02-17 14:37 ` Dietmar Eggemann
2026-02-17 22:02 ` Shubhang Kaushik
1 sibling, 1 reply; 70+ messages in thread
From: Dietmar Eggemann @ 2026-02-16 10:59 UTC (permalink / raw)
To: K Prateek Nayak, Shubhang Kaushik, Peter Zijlstra, mingo
Cc: juri.lelli, vincent.guittot, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel, dsmythies
On 16.02.26 04:14, K Prateek Nayak wrote:
> Hello Shubhang,
>
> On 2/14/2026 12:50 PM, Shubhang Kaushik wrote:
>> Hi Peter,
>>
>> On Fri, 30 Jan 2026, Peter Zijlstra wrote:
>>
>>> Two issues related to reweight_entity() were raised; poking at all that got me
>>> these patches.
>>>
>>> They're in queue.git/sched/core and I spend most of yesterday staring at traces
>>> trying to find anything wrong. So far, so good.
>>>
>>> Please test.
>>>
>>>
>>
>> I’m seeing a consistent NULL pointer dereference in pick_task_fair() when running hackbench on an Ampere Altra (80 cores arm64). This is happening after applying the complete patchset on the latest 6.19.0+ kernel with PREEMPT_DYNAMIC (full), CONFIG_SCHED_CLUSTER and NOHZ_FULL enabled.
>
> Can you confirm you using the latest changes from:
>
> git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core
>
> at commit bdba3187771c ("sched/fair: Use full weight to __calc_delta()")
> since this series has undergone some churn throughout the week?
I saw the same issue on my Arm64 big.Little board (12 CPUs) with the old
'queue.git sched/core' (i.e before s/div_s64()/div64_long()) in:
sched/fair: Increase weight bits for avg_vruntime
and test:
for ((i=0; i<20000; i++)) do yes > /dev/null & done
It's gone with:
git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core
commit bdba3187771c ("sched/fair: Use full weight to __calc_delta()")
Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
[...]
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-16 10:59 ` Dietmar Eggemann
@ 2026-02-17 14:37 ` Dietmar Eggemann
0 siblings, 0 replies; 70+ messages in thread
From: Dietmar Eggemann @ 2026-02-17 14:37 UTC (permalink / raw)
To: K Prateek Nayak, Shubhang Kaushik, Peter Zijlstra, mingo
Cc: juri.lelli, vincent.guittot, rostedt, bsegall, mgorman, vschneid,
linux-kernel, wangtao554, quzicheng, wuyun.abel, dsmythies
On 16.02.26 11:59, Dietmar Eggemann wrote:
> On 16.02.26 04:14, K Prateek Nayak wrote:
>> Hello Shubhang,
>>
>> On 2/14/2026 12:50 PM, Shubhang Kaushik wrote:
>>> Hi Peter,
>>>
>>> On Fri, 30 Jan 2026, Peter Zijlstra wrote:
[...]
> I saw the same issue on my Arm64 big.Little board (12 CPUs) with the old
> 'queue.git sched/core' (i.e before s/div_s64()/div64_long()) in:
>
> sched/fair: Increase weight bits for avg_vruntime
>
> and test:
>
> for ((i=0; i<20000; i++)) do yes > /dev/null & done
>
> It's gone with:
>
> git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core
>
> commit bdba3187771c ("sched/fair: Use full weight to __calc_delta()")
>
> Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
>
> [...]
No regression spotted on 'hammerdb - mysqld' ('client/LDG - server/SUT'
running on different ARM64 VMs)
AWS VM LDG (c7g.16xlarge) and SUT (m7gd.16xlarge ('maxcpus=16 nr_cpus=16').
Kernel | Throughput | P50 latency. |
aarch64 | (NOPM) | (larger is worse) |
--------------------+-------------+-------------------+
tip sched/core * | baseline | baseline |
queue sched/core ** | +0.8% | -1.0% |
--------------------+-------------+--------------------
* e34881c84c25 - sched: Re-evaluate scheduling when migrating queued
tasks out of throttled cgroups (2026-02-03 Zicheng Qu)
** bdba3187771c - sched/fair: Use full weight to __calc_delta()
(2026-02-13 Peter Zijlstra)
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-16 3:14 ` K Prateek Nayak
2026-02-16 10:59 ` Dietmar Eggemann
@ 2026-02-17 22:02 ` Shubhang Kaushik
1 sibling, 0 replies; 70+ messages in thread
From: Shubhang Kaushik @ 2026-02-17 22:02 UTC (permalink / raw)
To: K Prateek Nayak, Peter Zijlstra, mingo
Cc: juri.lelli, vincent.guittot, dietmar.eggemann, rostedt, bsegall,
mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
[-- Attachment #1: Type: text/plain, Size: 2988 bytes --]
Hi Prateek,
On Mon, 16 Feb 2026, K Prateek Nayak wrote:
> Hello Shubhang,
>
> On 2/14/2026 12:50 PM, Shubhang Kaushik wrote:
>> Hi Peter,
>>
>> On Fri, 30 Jan 2026, Peter Zijlstra wrote:
>>
>>> Two issues related to reweight_entity() were raised; poking at all that got me
>>> these patches.
>>>
>>> They're in queue.git/sched/core and I spend most of yesterday staring at traces
>>> trying to find anything wrong. So far, so good.
>>>
>>> Please test.
>>>
>>>
>>
>> I’m seeing a consistent NULL pointer dereference in pick_task_fair() when running hackbench on an Ampere Altra (80 cores arm64). This is happening after applying the complete patchset on the latest 6.19.0+ kernel with PREEMPT_DYNAMIC (full), CONFIG_SCHED_CLUSTER and NOHZ_FULL enabled.
>
> Can you confirm you using the latest changes from:
>
> git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core
>
> at commit bdba3187771c ("sched/fair: Use full weight to __calc_delta()")
> since this series has undergone some churn throughout the week?
>
Okay. I was not using commit bdba3187771c in my first test. After
updating to that commit on sched/core, the issue is resolved on my
machine.
>>
>> The system triggers a level 2 translation fault because pick_eevdf() returns NULL despite the runqueue having active tasks (cfs_rq->nr_running
>>> 0). When pick_next_task_fair() attempts to dereference this NULL pointer
>> to access the task structure, the kernel Oopses at pick_task_fair+0x48/0x148.
>>
>> pick_task_fair <- pick_eevdf() <- [active tasks]
>>
>> The root cause is an underflow in reweight_entity():
>> se->vprot -= avruntime;
>
> But how does it cause failure to pick? All vrpot does at pick is:
>
> /* curr needs to be queued and eligible first. */
> if (curr && (!curr->on_rq || !entity_eligible(cfs_rq, curr)))
> curr = NULL;
>
Because of the precision drift, the min_vruntime jumps ahead of the
actual task runtime. This made the task look ineligible, so curr was
being set to NULL.
> /* vprot only helps for early return below. */
> if (curr && protect && protect_slice(curr))
> return curr;
>
Since curr was already NULL from the step above, the code skipped this
protection check entirely. It then tried to search the rest of the tree
for a new task. But again, as the math was broken it found nothing and
returned NULL. That’s why the kernel crashed.
>
> Worst case "curr" runs till it loses eligibility even if vprot wraps
> and becomes a large value and moreover, wouldn't vruntime_cmp() in
> protect_slice() which compares the signed difference catch it?
>
> --
> Thanks and Regards,
> Prateek
>
>
The vruntime_cmp() should the handle the math, but the drift made
the comparison logic invalid. The rounding errors in set_protect_slice()
caused vprot and vruntime to be out of sync, breaking the eligibility
invariants.
Commit bdba3187771c restores the symmetry using 64-bit math which
prevents the NULL return.
Regards,
Shubhang Kaushik
^ permalink raw reply [flat|nested] 70+ messages in thread
* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
` (6 preceding siblings ...)
2026-02-14 7:20 ` Shubhang Kaushik
@ 2026-02-17 4:20 ` K Prateek Nayak
2026-02-18 18:37 ` Shubhang Kaushik
8 siblings, 0 replies; 70+ messages in thread
From: K Prateek Nayak @ 2026-02-17 4:20 UTC (permalink / raw)
To: Peter Zijlstra, mingo
Cc: juri.lelli, vincent.guittot, dietmar.eggemann, rostedt, bsegall,
mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
wuyun.abel, dsmythies
Hello Peter,
On 1/30/2026 3:04 PM, Peter Zijlstra wrote:
> Two issues related to reweight_entity() were raised; poking at all that got me
> these patches.
>
> They're in queue.git/sched/core and I spend most of yesterday staring at traces
> trying to find anything wrong. So far, so good.
>
> Please test.
For queue:sched/core at commit bdba3187771c ("sched/fair: Use full
weight to __calc_delta()"), here are the results:
o tl;dr
No consistent regressions observed so far. Ones that have a large
%diff either have a small baseline (like < 10us latency for schbench)
or have a large CV (like for 16-groups of hackbench).
Feel free to include:
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
o Full results
Baseline was commit cee73b1e840c ("Merge tag 'riscv-for-linus-7.0-mw1'
of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux"). Testing
was done on a 2 x 128C/256T 4th Generation EPYC system (Zen4c) with
boost enabled and C2 disabled.
==================================================================
Test : hackbench
Units : Normalized time in seconds
Interpretation: Lower is better
Statistic : AMean
==================================================================
Case: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
1-groups 1.00 [ -0.00](11.97) 1.09 [ -8.80](15.94)
2-groups 1.00 [ -0.00](14.01) 1.07 [ -7.40]( 8.55)
4-groups 1.00 [ -0.00]( 8.54) 0.98 [ 1.60]( 6.49)
8-groups 1.00 [ -0.00]( 2.78) 1.03 [ -3.01]( 2.35)
16-groups 1.00 [ -0.00]( 3.64) 1.08 [ -7.55]( 7.69)
==================================================================
Test : tbench
Units : Normalized throughput
Interpretation: Higher is better
Statistic : AMean
==================================================================
Clients: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
1 1.00 [ 0.00]( 0.20) 1.01 [ 1.04]( 0.06)
2 1.00 [ 0.00]( 0.37) 1.01 [ 1.22]( 0.07)
4 1.00 [ 0.00]( 0.37) 1.02 [ 1.53]( 0.35)
8 1.00 [ 0.00]( 0.43) 1.01 [ 1.10]( 0.57)
16 1.00 [ 0.00]( 0.11) 1.01 [ 0.83]( 0.25)
32 1.00 [ 0.00]( 1.61) 1.01 [ 0.86]( 0.57)
64 1.00 [ 0.00]( 0.19) 1.00 [ 0.21]( 1.48)
128 1.00 [ 0.00]( 0.22) 0.99 [ -1.23]( 1.53)
256 1.00 [ 0.00]( 0.22) 1.01 [ 0.58]( 0.42)
512 1.00 [ 0.00]( 2.23) 1.02 [ 1.83]( 3.35)
1024 1.00 [ 0.00]( 0.58) 1.00 [ 0.10]( 0.45)
2048 1.00 [ 0.00]( 0.46) 1.01 [ 0.51]( 0.07)
==================================================================
Test : stream-10
Units : Normalized Bandwidth, MB/s
Interpretation: Higher is better
Statistic : HMean
==================================================================
Test: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
Copy 1.00 [ 0.00]( 0.94) 1.00 [ -0.31]( 1.61)
Scale 1.00 [ 0.00]( 0.85) 1.00 [ -0.45]( 2.04)
Add 1.00 [ 0.00]( 0.84) 0.99 [ -0.55]( 1.77)
Triad 1.00 [ 0.00]( 0.78) 1.00 [ -0.46]( 1.63)
==================================================================
Test : stream-100
Units : Normalized Bandwidth, MB/s
Interpretation: Higher is better
Statistic : HMean
==================================================================
Test: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
Copy 1.00 [ 0.00]( 1.16) 1.00 [ 0.34]( 0.45)
Scale 1.00 [ 0.00]( 1.53) 1.01 [ 0.59]( 0.53)
Add 1.00 [ 0.00]( 1.14) 1.01 [ 0.60]( 0.47)
Triad 1.00 [ 0.00]( 1.14) 1.01 [ 0.52]( 0.34)
==================================================================
Test : netperf
Units : Normalized Througput
Interpretation: Higher is better
Statistic : AMean
==================================================================
Clients: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
1-clients 1.00 [ 0.00]( 0.14) 1.01 [ 0.96]( 0.10)
2-clients 1.00 [ 0.00]( 0.34) 1.01 [ 0.92]( 0.24)
4-clients 1.00 [ 0.00]( 0.13) 1.01 [ 0.71]( 0.94)
8-clients 1.00 [ 0.00]( 0.46) 1.01 [ 0.69]( 0.27)
16-clients 1.00 [ 0.00]( 0.62) 1.01 [ 0.74]( 0.91)
32-clients 1.00 [ 0.00]( 1.19) 1.01 [ 1.04]( 1.19)
64-clients 1.00 [ 0.00]( 1.81) 1.01 [ 0.62]( 1.64)
128-clients 1.00 [ 0.00]( 1.90) 1.00 [ 0.30]( 1.93)
256-clients 1.00 [ 0.00]( 1.76) 1.00 [ 0.27]( 1.75)
512-clients 1.00 [ 0.00]( 6.23) 0.99 [ -0.52]( 5.66)
768-clients 1.00 [ 0.00](33.00) 0.99 [ -0.91](34.32)
1024-clients 1.00 [ 0.00](38.21) 1.00 [ -0.18](32.98)
==================================================================
Test : schbench
Units : Normalized 99th percentile latency in us
Interpretation: Lower is better
Statistic : Median
==================================================================
#workers: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
1 1.00 [ -0.00](15.02) 1.47 [-47.06](32.99)
2 1.00 [ -0.00](17.83) 0.97 [ 2.94]( 4.58)
4 1.00 [ -0.00](12.22) 1.00 [ -0.00]( 3.07)
8 1.00 [ -0.00]( 2.38) 1.00 [ -0.00]( 2.38)
16 1.00 [ -0.00]( 1.92) 1.08 [ -7.69]( 3.15)
32 1.00 [ -0.00]( 2.37) 1.00 [ -0.00]( 0.78)
64 1.00 [ -0.00]( 0.85) 1.01 [ -0.85]( 3.92)
128 1.00 [ -0.00]( 1.21) 1.00 [ -0.48]( 1.47)
256 1.00 [ -0.00]( 0.39) 1.00 [ -0.00](12.20)
512 1.00 [ -0.00]( 0.20) 1.02 [ -2.07]( 2.04)
768 1.00 [ -0.00]( 5.68) 0.97 [ 3.11]( 7.62)
1024 1.00 [ -0.00]( 4.23) 1.01 [ -0.77]( 4.71)
==================================================================
Test : new-schbench-requests-per-second
Units : Normalized Requests per second
Interpretation: Higher is better
Statistic : Median
==================================================================
#workers: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
1 1.00 [ 0.00]( 0.00) 1.00 [ 0.00]( 0.00)
2 1.00 [ 0.00]( 0.15) 1.00 [ -0.29]( 0.00)
4 1.00 [ 0.00]( 0.00) 1.00 [ -0.29]( 0.00)
8 1.00 [ 0.00]( 0.00) 1.00 [ -0.29]( 0.00)
16 1.00 [ 0.00]( 0.15) 1.00 [ -0.29]( 0.15)
32 1.00 [ 0.00]( 0.15) 0.99 [ -0.59]( 0.15)
64 1.00 [ 0.00]( 0.15) 0.99 [ -0.59]( 0.00)
128 1.00 [ 0.00](13.29) 0.84 [-16.00](16.15)
256 1.00 [ 0.00]( 0.00) 1.00 [ 0.00]( 0.00)
512 1.00 [ 0.00]( 1.72) 1.00 [ 0.00]( 1.26)
768 1.00 [ 0.00]( 0.44) 0.99 [ -1.18]( 0.00)
1024 1.00 [ 0.00]( 0.37) 0.99 [ -0.54]( 0.42)
==================================================================
Test : new-schbench-wakeup-latency
Units : Normalized 99th percentile latency in us
Interpretation: Lower is better
Statistic : Median
==================================================================
#workers: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
1 1.00 [ -0.00](14.91) 1.25 [-25.00](11.07)
2 1.00 [ -0.00](18.20) 1.00 [ -0.00]( 4.43)
4 1.00 [ -0.00](15.10) 0.92 [ 7.69]( 9.11)
8 1.00 [ -0.00]( 4.84) 1.00 [ -0.00]( 0.00)
16 1.00 [ -0.00]( 0.00) 1.09 [ -9.09]( 4.43)
32 1.00 [ -0.00]( 4.84) 0.91 [ 9.09]( 0.00)
64 1.00 [ -0.00](10.68) 1.00 [ -0.00]( 5.53)
128 1.00 [ -0.00]( 9.68) 1.20 [-20.00]( 9.11)
256 1.00 [ -0.00]( 3.88) 0.96 [ 4.37]( 2.17)
512 1.00 [ -0.00]( 1.80) 1.00 [ -0.37]( 1.43)
768 1.00 [ -0.00]( 0.92) 1.00 [ -0.00]( 0.00)
1024 1.00 [ -0.00]( 0.00) 1.00 [ -0.00]( 2.64)
==================================================================
Test : new-schbench-request-latency
Units : Normalized 99th percentile latency in us
Interpretation: Lower is better
Statistic : Median
==================================================================
#workers: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
1 1.00 [ -0.00]( 0.27) 1.00 [ -0.00]( 0.00)
2 1.00 [ -0.00]( 0.00) 1.00 [ -0.26]( 0.00)
4 1.00 [ -0.00]( 0.14) 1.00 [ -0.26]( 0.00)
8 1.00 [ -0.00]( 0.00) 1.00 [ -0.26]( 0.00)
16 1.00 [ -0.00]( 0.14) 1.00 [ -0.26]( 0.00)
32 1.00 [ -0.00]( 0.27) 1.01 [ -0.53]( 0.49)
64 1.00 [ -0.00]( 0.14) 1.01 [ -0.53](30.11)
128 1.00 [ -0.00]( 2.99) 1.04 [ -4.41]( 3.96)
256 1.00 [ -0.00]( 0.52) 0.99 [ 1.15]( 0.43)
512 1.00 [ -0.00]( 2.81) 1.01 [ -1.22]( 2.69)
768 1.00 [ -0.00]( 0.46) 0.97 [ 3.27]( 0.46)
1024 1.00 [ -0.00]( 0.14) 1.00 [ -0.35]( 0.29)
I reran hackbench just to make sure the regression was a blip and as
expected there isn't any regression on the rerun:
==================================================================
Test : hackbench-rerun
Units : Normalized time in seconds
Interpretation: Lower is better
Statistic : AMean
==================================================================
Case: upstream:cee73b1e840c[pct imp](CV) queue:sched/core[pct imp](CV)
1-groups 1.00 [ -0.00](13.66) 0.93 [ 6.88]( 3.91)
2-groups 1.00 [ -0.00]( 9.40) 0.87 [ 12.95](14.81)
4-groups 1.00 [ -0.00]( 3.58) 0.98 [ 2.03]( 3.67)
8-groups 1.00 [ -0.00]( 3.52) 1.01 [ -1.28]( 2.73)
16-groups 1.00 [ -0.00]( 7.05) 0.99 [ 1.11]( 3.96)
--
Thanks and Regards,
Prateek
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-01-30 9:34 [PATCH 0/4] sched: Various reweight_entity() fixes Peter Zijlstra
` (7 preceding siblings ...)
2026-02-17 4:20 ` K Prateek Nayak
@ 2026-02-18 18:37 ` Shubhang Kaushik
2026-02-19 7:53 ` Peter Zijlstra
8 siblings, 1 reply; 70+ messages in thread
From: Shubhang Kaushik @ 2026-02-18 18:37 UTC (permalink / raw)
To: Peter Zijlstra, mingo
Cc: juri.lelli, vincent.guittot, dietmar.eggemann, rostedt, bsegall,
mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies
Hello Peter,
On Fri, 30 Jan 2026, Peter Zijlstra wrote:
> Two issues related to reweight_entity() were raised; poking at all that got me
> these patches.
>
> They're in queue.git/sched/core and I spend most of yesterday staring at traces
> trying to find anything wrong. So far, so good.
>
> Please test.
>
>
Analysis of commit bdba3187771c ("sched/fair: Use full weight to
__calc_delta()") confirms it resolves a scaling bottleneck present in the
v7.0-rc baseline (cee73b1e840c).
On Ampere Altra (80 cores) non-SMT SMP with CONFIG_NOHZ_FULL and
CONFIG_SCHED_CLUSTER enabled, the baseline suffered from vruntime
distortion that caused significant scheduling jitter, resulting in
measurable performance cliffs under high parallel load.
Llama AIO for Inference Scaling : The baseline shows a performance cliffs
at high thread counts, due to the scheduler miscalculating time slices
for tail threads, which forced the entire synchronous inference batch to
wait. The patch corrects the delta calculation for predictable scaling.
n_threads Baseline (cee73b1e840c) Patched (bdba3187771c) Diff
51 8.46 t/s 12.12 t/s +43.3%
52 17.75 t/s 22.26 t/s +25.4%
64 12.40 t/s 14.66 t/s +18.2%
Hackbench scaling in the baseline was non-linear indicating excessive
scheduling overhead as process counts increased. By using the full weight
for delta calculations, the patch reduces unnecessary migrations and
improves message throughput.
Task Count Baseline(sec) Patched(sec) Throughput
16 Processes 51.25s 44.09s +16.2%
32 Processes 92.42s 78.09s +18.3%
Tested-by: Shubhang Kaushik <shubhang@os.amperecomputing.com>
Regards,
Shubhang Kaushik
^ permalink raw reply [flat|nested] 70+ messages in thread* Re: [PATCH 0/4] sched: Various reweight_entity() fixes
2026-02-18 18:37 ` Shubhang Kaushik
@ 2026-02-19 7:53 ` Peter Zijlstra
0 siblings, 0 replies; 70+ messages in thread
From: Peter Zijlstra @ 2026-02-19 7:53 UTC (permalink / raw)
To: Shubhang Kaushik
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, vschneid, linux-kernel, wangtao554, quzicheng,
kprateek.nayak, wuyun.abel, dsmythies
On Wed, Feb 18, 2026 at 10:37:19AM -0800, Shubhang Kaushik wrote:
> Hello Peter,
>
> On Fri, 30 Jan 2026, Peter Zijlstra wrote:
>
> > Two issues related to reweight_entity() were raised; poking at all that got me
> > these patches.
> >
> > They're in queue.git/sched/core and I spend most of yesterday staring at traces
> > trying to find anything wrong. So far, so good.
> >
> > Please test.
> >
> >
>
> Analysis of commit bdba3187771c ("sched/fair: Use full weight to
> __calc_delta()") confirms it resolves a scaling bottleneck present in the
> v7.0-rc baseline (cee73b1e840c).
>
> On Ampere Altra (80 cores) non-SMT SMP with CONFIG_NOHZ_FULL and
> CONFIG_SCHED_CLUSTER enabled, the baseline suffered from vruntime distortion
> that caused significant scheduling jitter, resulting in measurable
> performance cliffs under high parallel load.
>
> Llama AIO for Inference Scaling : The baseline shows a performance cliffs at
> high thread counts, due to the scheduler miscalculating time slices for tail
> threads, which forced the entire synchronous inference batch to wait. The
> patch corrects the delta calculation for predictable scaling.
>
> n_threads Baseline (cee73b1e840c) Patched (bdba3187771c) Diff
> 51 8.46 t/s 12.12 t/s +43.3%
> 52 17.75 t/s 22.26 t/s +25.4%
> 64 12.40 t/s 14.66 t/s +18.2%
>
> Hackbench scaling in the baseline was non-linear indicating excessive
> scheduling overhead as process counts increased. By using the full weight
> for delta calculations, the patch reduces unnecessary migrations and
> improves message throughput.
>
> Task Count Baseline(sec) Patched(sec) Throughput
> 16 Processes 51.25s 44.09s +16.2%
> 32 Processes 92.42s 78.09s +18.3%
>
> Tested-by: Shubhang Kaushik <shubhang@os.amperecomputing.com>
These are excellent results, thanks!
Let me finally get around to posting them.
^ permalink raw reply [flat|nested] 70+ messages in thread
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