[PATCH AUTOSEL 6.8 11/30] drop_monitor: replace spin_lock by raw_spin_lock

Sasha Levin
2024-05-27T14:14:40Z

From: Wander Lairson Costa <wander@redhat.com>

[ Upstream commit f1e197a665c2148ebc25fe09c53689e60afea195 ]

trace_drop_common() is called with preemption disabled, and it acquires
a spin_lock. This is problematic for RT kernels because spin_locks are
sleeping locks in this configuration, which causes the following splat:

BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 449, name: rcuc/47
preempt_count: 1, expected: 0
RCU nest depth: 2, expected: 2
5 locks held by rcuc/47/449:
#0: ff1100086ec30a60 ((softirq_ctrl.lock)){+.+.}-{2:2}, at: __local_bh_disable_ip+0x105/0x210
#1: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: rt_spin_lock+0xbf/0x130
#2: ffffffffb394a280 (rcu_read_lock){....}-{1:2}, at: __local_bh_disable_ip+0x11c/0x210
#3: ffffffffb394a160 (rcu_callback){....}-{0:0}, at: rcu_do_batch+0x360/0xc70
#4: ff1100086ee07520 (&data->lock){+.+.}-{2:2}, at: trace_drop_common.constprop.0+0xb5/0x290
irq event stamp: 139909
hardirqs last enabled at (139908): [<ffffffffb1df2b33>] _raw_spin_unlock_irqrestore+0x63/0x80
hardirqs last disabled at (139909): [<ffffffffb19bd03d>] trace_drop_common.constprop.0+0x26d/0x290
softirqs last enabled at (139892): [<ffffffffb07a1083>] __local_bh_enable_ip+0x103/0x170
softirqs last disabled at (139898): [<ffffffffb0909b33>] rcu_cpu_kthread+0x93/0x1f0
Preemption disabled at:
[<ffffffffb1de786b>] rt_mutex_slowunlock+0xab/0x2e0
CPU: 47 PID: 449 Comm: rcuc/47 Not tainted 6.9.0-rc2-rt1+ #7
Hardware name: Dell Inc. PowerEdge R650/0Y2G81, BIOS 1.6.5 04/15/2022
Call Trace:
<TASK>
dump_stack_lvl+0x8c/0xd0
dump_stack+0x14/0x20
__might_resched+0x21e/0x2f0
rt_spin_lock+0x5e/0x130
? trace_drop_common.constprop.0+0xb5/0x290
? skb_queue_purge_reason.part.0+0x1bf/0x230
trace_drop_common.constprop.0+0xb5/0x290
? preempt_count_sub+0x1c/0xd0
? _raw_spin_unlock_irqrestore+0x4a/0x80
? __pfx_trace_drop_common.constprop.0+0x10/0x10
? rt_mutex_slowunlock+0x26a/0x2e0
? skb_queue_purge_reason.part.0+0x1bf/0x230
? __pfx_rt_mutex_slowunlock+0x10/0x10
? skb_queue_purge_reason.part.0+0x1bf/0x230
trace_kfree_skb_hit+0x15/0x20
trace_kfree_skb+0xe9/0x150
kfree_skb_reason+0x7b/0x110
skb_queue_purge_reason.part.0+0x1bf/0x230
? __pfx_skb_queue_purge_reason.part.0+0x10/0x10
? mark_lock.part.0+0x8a/0x520
...

trace_drop_common() also disables interrupts, but this is a minor issue
because we could easily replace it with a local_lock.

Replace the spin_lock with raw_spin_lock to avoid sleeping in atomic
context.

Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Reported-by: Hu Chunyu <chuhu@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/core/drop_monitor.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c
index b0f221d658be8..430ed18f8584c 100644
--- a/net/core/drop_monitor.c
+++ b/net/core/drop_monitor.c
@@ -74,7 +74,7 @@ struct net_dm_hw_entries {
};

struct per_cpu_dm_data {
- spinlock_t lock; /* Protects 'skb', 'hw_entries' and
+ raw_spinlock_t lock; /* Protects 'skb', 'hw_entries' and
* 'send_timer'
*/
union {
@@ -168,9 +168,9 @@ static struct sk_buff *reset_per_cpu_data(struct per_cpu_dm_data *data)
err:
mod_timer(&data->send_timer, jiffies + HZ / 10);
out:
- spin_lock_irqsave(&data->lock, flags);
+ raw_spin_lock_irqsave(&data->lock, flags);
swap(data->skb, skb);
- spin_unlock_irqrestore(&data->lock, flags);
+ raw_spin_unlock_irqrestore(&data->lock, flags);

if (skb) {
struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
@@ -225,7 +225,7 @@ static void trace_drop_common(struct sk_buff *skb, void *location)

local_irq_save(flags);
data = this_cpu_ptr(&dm_cpu_data);
- spin_lock(&data->lock);
+ raw_spin_lock(&data->lock);
dskb = data->skb;

if (!dskb)
@@ -259,7 +259,7 @@ static void trace_drop_common(struct sk_buff *skb, void *location)
}

out:
- spin_unlock_irqrestore(&data->lock, flags);
+ raw_spin_unlock_irqrestore(&data->lock, flags);
}

static void trace_kfree_skb_hit(void *ignore, struct sk_buff *skb,
@@ -314,9 +314,9 @@ net_dm_hw_reset_per_cpu_data(struct per_cpu_dm_data *hw_data)
mod_timer(&hw_data->send_timer, jiffies + HZ / 10);
}

- spin_lock_irqsave(&hw_data->lock, flags);
+ raw_spin_lock_irqsave(&hw_data->lock, flags);
swap(hw_data->hw_entries, hw_entries);
- spin_unlock_irqrestore(&hw_data->lock, flags);
+ raw_spin_unlock_irqrestore(&hw_data->lock, flags);

return hw_entries;
}
@@ -448,7 +448,7 @@ net_dm_hw_trap_summary_probe(void *ignore, const struct devlink *devlink,
return;

hw_data = this_cpu_ptr(&dm_hw_cpu_data);
- spin_lock_irqsave(&hw_data->lock, flags);
+ raw_spin_lock_irqsave(&hw_data->lock, flags);
hw_entries = hw_data->hw_entries;

if (!hw_entries)
@@ -477,7 +477,7 @@ net_dm_hw_trap_summary_probe(void *ignore, const struct devlink *devlink,
}

out:
- spin_unlock_irqrestore(&hw_data->lock, flags);
+ raw_spin_unlock_irqrestore(&hw_data->lock, flags);
}

static const struct net_dm_alert_ops net_dm_alert_summary_ops = {
@@ -1673,7 +1673,7 @@ static struct notifier_block dropmon_net_notifier = {

static void __net_dm_cpu_data_init(struct per_cpu_dm_data *data)
{
- spin_lock_init(&data->lock);
+ raw_spin_lock_init(&data->lock);
skb_queue_head_init(&data->drop_queue);
u64_stats_init(&data->stats.syncp);
}
--
2.43.0