* Re: oom is broken in mmotm 2010-11-09-15-31 tree?
[not found] <1043135380.1026761291266384009.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
@ 2010-12-02 5:07 ` caiqian
2010-12-02 5:12 ` Linus Torvalds
0 siblings, 1 reply; 10+ messages in thread
From: caiqian @ 2010-12-02 5:07 UTC (permalink / raw)
To: CAI Qian
Cc: linux-mm, Michel Lespinasse, Rik van Riel, Wu Fengguang,
H. Peter Anvin, Linus Torvalds
> [ 580.192024] kswapd0 33 49939.236793 5021 120
> 49939.236793 39855.128906 456899.562827 /
Follow-up on this, kswapd0 was doing this from SysRq-T output,
[ 2836.085008] kswapd0 R running task 0 33 2 0x00000000
[ 2836.085008] ffff8802276f9b10 0000000000000046 0000000000000000 ffffffff8100a84e
[ 2836.085008] 00000000000136c0 00000000000136c0 00000000000136c0 ffff88022b70c590
[ 2836.085008] 00000000000136c0 ffff8802276f9fd8 00000000000136c0 00000000000136c0
[ 2836.085008] Call Trace:
[ 2836.085008] [<ffffffff8100a84e>] ? call_function_interrupt+0xe/0x20
[ 2836.085008] [<ffffffff81114594>] ? mem_cgroup_del_lru_list+0x42/0x76
[ 2836.085008] [<ffffffff8104a437>] __cond_resched+0x2a/0x35
[ 2836.085008] [<ffffffff8146503c>] _cond_resched+0x1b/0x22
[ 2836.085008] [<ffffffff810e03c7>] shrink_page_list+0x53/0x469
[ 2836.085008] [<ffffffff810df7ba>] ? update_isolated_counts.clone.27+0x13d/0x15b
[ 2836.085008] [<ffffffff810e0bcf>] shrink_inactive_list+0x22b/0x376
[ 2836.085008] [<ffffffff810db07c>] ? determine_dirtyable_memory+0x1d/0x26
[ 2836.085008] [<ffffffff810e12eb>] shrink_zone+0x32e/0x3ca
[ 2836.085008] [<ffffffff814665ae>] ? _raw_spin_lock+0xe/0x10
[ 2836.085008] [<ffffffff810e1e5d>] balance_pgdat+0x242/0x417
[ 2836.085008] [<ffffffff810e2258>] kswapd+0x226/0x23c
[ 2836.085008] [<ffffffff81069c8b>] ? autoremove_wake_function+0x0/0x39
[ 2836.085008] [<ffffffff81466617>] ? _raw_spin_unlock_irqrestore+0x17/0x19
[ 2836.085008] [<ffffffff810e2032>] ? kswapd+0x0/0x23c
[ 2836.085008] [<ffffffff810697da>] kthread+0x82/0x8a
[ 2836.085008] [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10
[ 2836.085008] [<ffffffff81069758>] ? kthread+0x0/0x8a
[ 2836.085008] [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10
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^ permalink raw reply [flat|nested] 10+ messages in thread* Re: oom is broken in mmotm 2010-11-09-15-31 tree?
2010-12-02 5:07 ` oom is broken in mmotm 2010-11-09-15-31 tree? caiqian
@ 2010-12-02 5:12 ` Linus Torvalds
2010-12-02 6:40 ` CAI Qian
0 siblings, 1 reply; 10+ messages in thread
From: Linus Torvalds @ 2010-12-02 5:12 UTC (permalink / raw)
To: caiqian
Cc: linux-mm, Michel Lespinasse, Rik van Riel, Wu Fengguang,
H. Peter Anvin
On Wed, Dec 1, 2010 at 9:07 PM, <caiqian@redhat.com> wrote:
>
>> [ 580.192024] kswapd0 33 49939.236793 5021 120
>> 49939.236793 39855.128906 456899.562827 /
> Follow-up on this, kswapd0 was doing this from SysRq-T output,
Ok, this does seem like a lot of pages are busy, so shrink_page_list
ends up just looping.
And that is indeed the bug that commit d88c0922fa0e should have fixed.
So please check whether the kernel you are running has that fix
applied to it or not.
Linus
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^ permalink raw reply [flat|nested] 10+ messages in thread* Re: oom is broken in mmotm 2010-11-09-15-31 tree?
2010-12-02 5:12 ` Linus Torvalds
@ 2010-12-02 6:40 ` CAI Qian
2010-12-02 6:48 ` CAI Qian
0 siblings, 1 reply; 10+ messages in thread
From: CAI Qian @ 2010-12-02 6:40 UTC (permalink / raw)
To: Linus Torvalds
Cc: linux-mm, Michel Lespinasse, Rik van Riel, Wu Fengguang,
H. Peter Anvin
> Ok, this does seem like a lot of pages are busy, so shrink_page_list
> ends up just looping.
>
> And that is indeed the bug that commit d88c0922fa0e should have
> fixed.
>
> So please check whether the kernel you are running has that fix
> applied to it or not.
Indeed, I was able to reproduce it anymore after applied this patch. Thanks.
CAI Qian
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^ permalink raw reply [flat|nested] 10+ messages in thread
[parent not found: <1415319777.1020071291259410217.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>]
* oom is broken in mmotm 2010-11-09-15-31 tree?
@ 2010-12-01 2:44 CAI Qian
2010-12-01 19:29 ` CAI Qian
0 siblings, 1 reply; 10+ messages in thread
From: CAI Qian @ 2010-12-01 2:44 UTC (permalink / raw)
To: linux-mm
Hi, just a head-up. When testing oom for this tree, my workstation is immediately having no response to ssh, Desktop actions and so on apart from ping. I am trying to bisect but looks like git public server is having problem.
# git pull
fatal: read error: Connection reset by peer
# git clone git://zen-kernel.org/kernel/mmotm.git
Cloning into mmotm...
fatal: read error: Connection reset by peer
CAI Qian
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^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: oom is broken in mmotm 2010-11-09-15-31 tree?
2010-12-01 2:44 CAI Qian
@ 2010-12-01 19:29 ` CAI Qian
2010-12-01 20:15 ` Linus Torvalds
0 siblings, 1 reply; 10+ messages in thread
From: CAI Qian @ 2010-12-01 19:29 UTC (permalink / raw)
To: linux-mm
Cc: Michel Lespinasse, Rik van Riel, Linus Torvalds, Wu Fengguang,
H. Peter Anvin
> Hi, just a head-up. When testing oom for this tree, my workstation is
> immediately having no response to ssh, Desktop actions and so on apart
> from ping. I am trying to bisect but looks like git public server is
> having problem.
>
> # git pull
> fatal: read error: Connection reset by peer
>
> # git clone git://zen-kernel.org/kernel/mmotm.git
> Cloning into mmotm...
> fatal: read error: Connection reset by peer
This turned out that it was introduced by,
d065bd810b6deb67d4897a14bfe21f8eb526ba99
mm: retry page fault when blocking on disk transfer
It was reproduced by:
1) ssh to the test box.
2) try to trigger oom a few times using a malloc program there.
Then, the test box will be unable to process any oom to kill the memory allocation program. If switch VCs for the test box and hit a few ENTER keys locally manually, it may process further oom. After roll-back this one commit, it had no problem to cope the above reproducers and always correctly killed the allocation programs.
CAI Qian
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^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: oom is broken in mmotm 2010-11-09-15-31 tree?
2010-12-01 19:29 ` CAI Qian
@ 2010-12-01 20:15 ` Linus Torvalds
2010-12-01 21:40 ` Michel Lespinasse
2010-12-02 4:26 ` CAI Qian
0 siblings, 2 replies; 10+ messages in thread
From: Linus Torvalds @ 2010-12-01 20:15 UTC (permalink / raw)
To: CAI Qian
Cc: linux-mm, Michel Lespinasse, Rik van Riel, Wu Fengguang,
H. Peter Anvin
On Wed, Dec 1, 2010 at 11:29 AM, CAI Qian <caiqian@redhat.com> wrote:
>>
>> Hi, just a head-up. When testing oom for this tree, my workstation is
>> immediately having no response to ssh, Desktop actions and so on apart
>> from ping. I am trying to bisect but looks like git public server is
>> having problem.
>
> This turned out that it was introduced by,
>
> d065bd810b6deb67d4897a14bfe21f8eb526ba99
> mm: retry page fault when blocking on disk transfer
>
> It was reproduced by:
> 1) ssh to the test box.
> 2) try to trigger oom a few times using a malloc program there.
Interesting. That commit is not supposed to make any semantic
difference at all. And even if we do end up in the retry path, the
arch/x86/mm/fault.c code is very explicitly designed so that it
retries only _once_.
Michel, any ideas? I could see problems with the mmap_sem if
VM_FAULT_OOM is set at the same time as VM_FAULT_RETRY, but I can't
see how that could ever happen.
Anybody?
CAI, can you get any output from sysrq-W when this happens?
Linus
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^ permalink raw reply [flat|nested] 10+ messages in thread* Re: oom is broken in mmotm 2010-11-09-15-31 tree?
2010-12-01 20:15 ` Linus Torvalds
@ 2010-12-01 21:40 ` Michel Lespinasse
2010-12-02 4:26 ` CAI Qian
1 sibling, 0 replies; 10+ messages in thread
From: Michel Lespinasse @ 2010-12-01 21:40 UTC (permalink / raw)
To: Linus Torvalds
Cc: CAI Qian, linux-mm, Rik van Riel, Wu Fengguang, H. Peter Anvin
On Wed, Dec 1, 2010 at 12:15 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Wed, Dec 1, 2010 at 11:29 AM, CAI Qian <caiqian@redhat.com> wrote:
>>>
>>> Hi, just a head-up. When testing oom for this tree, my workstation is
>>> immediately having no response to ssh, Desktop actions and so on apart
>>> from ping. I am trying to bisect but looks like git public server is
>>> having problem.
>>
>> This turned out that it was introduced by,
>>
>> d065bd810b6deb67d4897a14bfe21f8eb526ba99
>> mm: retry page fault when blocking on disk transfer
>>
>> It was reproduced by:
>> 1) ssh to the test box.
>> 2) try to trigger oom a few times using a malloc program there.
>
> Interesting. That commit is not supposed to make any semantic
> difference at all. And even if we do end up in the retry path, the
> arch/x86/mm/fault.c code is very explicitly designed so that it
> retries only _once_.
>
> Michel, any ideas? I could see problems with the mmap_sem if
> VM_FAULT_OOM is set at the same time as VM_FAULT_RETRY, but I can't
> see how that could ever happen.
>
> Anybody?
>
> CAI, can you get any output from sysrq-W when this happens?
Things are known to be broken between
d065bd810b6deb67d4897a14bfe21f8eb526ba99 and
d88c0922fa0e2c021a028b310a641126c6d4b7dc. CAI, do you have that in
your tree ? Also, can you test at
d065bd810b6deb67d4897a14bfe21f8eb526ba99 with
d88c0922fa0e2c021a028b310a641126c6d4b7dc cherry-picked on ?
--
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
--
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^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: oom is broken in mmotm 2010-11-09-15-31 tree?
2010-12-01 20:15 ` Linus Torvalds
2010-12-01 21:40 ` Michel Lespinasse
@ 2010-12-02 4:26 ` CAI Qian
1 sibling, 0 replies; 10+ messages in thread
From: CAI Qian @ 2010-12-02 4:26 UTC (permalink / raw)
To: Linus Torvalds
Cc: linux-mm, Michel Lespinasse, Rik van Riel, Wu Fengguang,
H. Peter Anvin
> Interesting. That commit is not supposed to make any semantic
> difference at all. And even if we do end up in the retry path, the
> arch/x86/mm/fault.c code is very explicitly designed so that it
> retries only _once_.
>
> Michel, any ideas? I could see problems with the mmap_sem if
> VM_FAULT_OOM is set at the same time as VM_FAULT_RETRY, but I can't
> see how that could ever happen.
>
> Anybody?
>
> CAI, can you get any output from sysrq-W when this happens?
Hi Linus, please see below,
CAI Qian
[ 580.191996] SysRq : Show Blocked State
[ 580.192024] task PC stack pid father
[ 580.192024] Sched Debug Version: v0.09, 2.6.36+ #22
[ 580.192024] now at 580203.234510 msecs
[ 580.192024] .jiffies : 4295247509
[ 580.192024] .sysctl_sched_latency : 18.000000
[ 580.192024] .sysctl_sched_min_granularity : 2.250000
[ 580.192024] .sysctl_sched_wakeup_granularity : 3.000000
[ 580.192024] .sysctl_sched_child_runs_first : 0
[ 580.192024] .sysctl_sched_features : 31855
[ 580.192024] .sysctl_sched_tunable_scaling : 1 (logaritmic)
[ 580.192024]
[ 580.192024] cpu#0, 2826.528 MHz
[ 580.192024] .nr_running : 1
[ 580.192024] .load : 1024
[ 580.192024] .nr_switches : 35799
[ 580.192024] .nr_load_updates : 128515
[ 580.192024] .nr_uninterruptible : 0
[ 580.192024] .next_balance : 4295.247545
[ 580.192024] .curr->pid : 1366
[ 580.192024] .clock : 580191.025058
[ 580.192024] .cpu_load[0] : 1024
[ 580.192024] .cpu_load[1] : 1016
[ 580.192024] .cpu_load[2] : 957
[ 580.192024] .cpu_load[3] : 872
[ 580.192024] .cpu_load[4] : 799
[ 580.192024] .yld_count : 140
[ 580.192024] .sched_switch : 0
[ 580.192024] .sched_count : 44224
[ 580.192024] .sched_goidle : 6268
[ 580.192024] .avg_idle : 1000000
[ 580.192024] .ttwu_count : 11413
[ 580.192024] .ttwu_local : 8684
[ 580.192024] .bkl_count : 0
[ 580.192024]
[ 580.192024] cfs_rq[0]:/
[ 580.192024] .exec_clock : 125215.744234
[ 580.192024] .MIN_vruntime : 0.000001
[ 580.192024] .min_vruntime : 45692.541683
[ 580.192024] .max_vruntime : 0.000001
[ 580.192024] .spread : 0.000000
[ 580.192024] .spread0 : 0.000000
[ 580.192024] .nr_running : 1
[ 580.192024] .load : 1024
[ 580.192024] .nr_spread_over : 4
[ 580.192024] .shares : 0
[ 580.192024]
[ 580.192024] rt_rq[0]:/
[ 580.192024] .rt_nr_running : 0
[ 580.192024] .rt_throttled : 0
[ 580.192024] .rt_time : 0.000000
[ 580.192024] .rt_runtime : 950.000000
[ 580.192024]
[ 580.192024] runnable tasks:
[ 580.192024] task PID tree-key switches prio exec-runtime sum-exec sum-sleep
[ 580.192024] ----------------------------------------------------------------------------------------------------------
[ 580.192024] R sendmail 1366 45692.541683 9276 120 45692.541683 46469.996943 411694.347209 /
[ 580.192024]
[ 580.192024] cpu#1, 2826.528 MHz
[ 580.192024] .nr_running : 2
[ 580.192024] .load : 2048
[ 580.192024] .nr_switches : 46514
[ 580.192024] .nr_load_updates : 130936
[ 580.192024] .nr_uninterruptible : 0
[ 580.192024] .next_balance : 4295.247917
[ 580.192024] .curr->pid : 1295
[ 580.192024] .clock : 580557.002284
[ 580.192024] .cpu_load[0] : 2048
[ 580.192024] .cpu_load[1] : 1520
[ 580.192024] .cpu_load[2] : 1679
[ 580.192024] .cpu_load[3] : 1513
[ 580.192024] .cpu_load[4] : 1688
[ 580.192024] .yld_count : 124
[ 580.192024] .sched_switch : 0
[ 580.192024] .sched_count : 54526
[ 580.192024] .sched_goidle : 6063
[ 580.192024] .avg_idle : 1000000
[ 580.192024] .ttwu_count : 9145
[ 580.192024] .ttwu_local : 5902
[ 580.192024] .bkl_count : 0
[ 580.192024]
[ 580.192024] cfs_rq[1]:/
[ 580.192024] .exec_clock : 122340.374690
[ 580.192024] .MIN_vruntime : 51807.120538
[ 580.192024] .min_vruntime : 51807.120538
[ 580.192024] .max_vruntime : 51807.120538
[ 580.192024] .spread : 0.000000
[ 580.192024] .spread0 : 6114.578855
[ 580.192024] .nr_running : 2
[ 580.192024] .load : 2048
[ 580.192024] .nr_spread_over : 1
[ 580.192024] .shares : 0
[ 580.192024]
[ 580.192024] rt_rq[1]:/
[ 580.192024] .rt_nr_running : 0
[ 580.192024] .rt_throttled : 0
[ 580.192024] .rt_time : 0.000000
[ 580.192024] .rt_runtime : 950.000000
[ 580.192024]
[ 580.192024] runnable tasks:
[ 580.192024] task PID tree-key switches prio exec-runtime sum-exec sum-sleep
[ 580.192024] ----------------------------------------------------------------------------------------------------------
[ 580.192024] kworker/1:1 30 51798.120538 3390 120 51798.120538 14.488166 578377.071351 /
[ 580.192024] Rhald-addon-inpu 1295 52383.947330 3612 120 52388.948353 21427.078504 454223.044707 /
[ 580.192024] sshd 1494 51807.120538 4985 120 51807.120538 41792.344148 43008.912088 /
[ 580.192024]
[ 580.192024] cpu#2, 2826.528 MHz
[ 580.192024] .nr_running : 3
[ 580.192024] .load : 3072
[ 580.192024] .nr_switches : 38687
[ 580.192024] .nr_load_updates : 128857
[ 580.192024] .nr_uninterruptible : 0
[ 580.192024] .next_balance : 4295.248178
[ 580.192024] .curr->pid : 1002
[ 580.192024] .clock : 580830.001334
[ 580.192024] .cpu_load[0] : 3072
[ 580.192024] .cpu_load[1] : 2688
[ 580.192024] .cpu_load[2] : 2231
[ 580.192024] .cpu_load[3] : 2408
[ 580.192024] .cpu_load[4] : 2606
[ 580.192024] .yld_count : 0
[ 580.192024] .sched_switch : 0
[ 580.192024] .sched_count : 49977
[ 580.192024] .sched_goidle : 4442
[ 580.192024] .avg_idle : 1000000
[ 580.192024] .ttwu_count : 7958
[ 580.192024] .ttwu_local : 5710
[ 580.192024] .bkl_count : 0
[ 580.192024]
[ 580.192024] cfs_rq[2]:/
[ 580.192024] .exec_clock : 122185.543310
[ 580.192024] .MIN_vruntime : 49939.236793
[ 580.192024] .min_vruntime : 49948.236793
[ 580.192024] .max_vruntime : 49939.236793
[ 580.192024] .spread : 0.000000
[ 580.192024] .spread0 : 4255.695110
[ 580.192024] .nr_running : 3
[ 580.192024] .load : 3072
[ 580.192024] .nr_spread_over : 5
[ 580.192024] .shares : 0
[ 580.192024]
[ 580.192024] rt_rq[2]:/
[ 580.192024] .rt_nr_running : 0
[ 580.192024] .rt_throttled : 0
[ 580.192024] .rt_time : 0.000000
[ 580.192024] .rt_runtime : 950.000000
[ 580.192024]
[ 580.192024] runnable tasks:
[ 580.192024] task PID tree-key switches prio exec-runtime sum-exec sum-sleep
[ 580.192024] ----------------------------------------------------------------------------------------------------------
[ 580.192024] kworker/2:1 31 49939.236793 3110 120 49939.236793 16.244410 577598.865226 /
[ 580.192024] kswapd0 33 49939.236793 5021 120 49939.236793 39855.128906 456899.562827 /
[ 580.192024] R irqbalance 1002 50700.231326 10599 120 50705.232536 37995.007739 451842.051677 /
[ 580.192024]
[ 580.192024] cpu#3, 2826.528 MHz
[ 580.192024] .nr_running : 2
[ 580.192024] .load : 2048
[ 580.192024] .nr_switches : 28514
[ 580.192024] .nr_load_updates : 142983
[ 580.192024] .nr_uninterruptible : 0
[ 580.192024] .next_balance : 4295.248441
[ 580.192024] .curr->pid : 1517
[ 580.192024] .clock : 581105.001367
[ 580.192024] .cpu_load[0] : 2048
[ 580.192024] .cpu_load[1] : 2048
[ 580.192024] .cpu_load[2] : 6702
[ 580.192024] .cpu_load[3] : 6746
[ 580.192024] .cpu_load[4] : 5982
[ 580.192024] .yld_count : 179
[ 580.192024] .sched_switch : 0
[ 580.192024] .sched_count : 38579
[ 580.192024] .sched_goidle : 5981
[ 580.192024] .avg_idle : 1000000
[ 580.192024] .ttwu_count : 8881
[ 580.192024] .ttwu_local : 7007
[ 580.192024] .bkl_count : 0
[ 580.192024]
[ 580.192024] cfs_rq[3]:/
[ 580.192024] .exec_clock : 135810.747600
[ 580.192024] .MIN_vruntime : 64636.582469
[ 580.192024] .min_vruntime : 64645.582469
[ 580.192024] .max_vruntime : 64636.582469
[ 580.192024] .spread : 0.000000
[ 580.192024] .spread0 : 18953.040786
[ 580.192024] .nr_running : 3
[ 580.192024] .load : 8148
[ 580.192024] .nr_spread_over : 4
[ 580.192024] .shares : 0
[ 580.192024]
[ 580.192024] rt_rq[3]:/
[ 580.192024] .rt_nr_running : 0
[ 580.192024] .rt_throttled : 0
[ 580.192024] .rt_time : 0.000000
[ 580.192024] .rt_runtime : 950.000000
[ 580.192024]
[ 580.192024] runnable tasks:
[ 580.192024] task PID tree-key switches prio exec-runtime sum-exec sum-sleep
[ 580.192024] ----------------------------------------------------------------------------------------------------------
[ 580.192024] kworker/3:1 32 64636.582469 4854 120 64636.582469 856.962108 576060.366837 /
[ 580.192024] audispd 952 64636.582469 96 112 64636.582469 7948.252669 553967.243338 /
[ 580.192024] R oom01 1517 65744.576906 64 120 65748.577669 11613.730238 0.000000 /
[ 580.192024]
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2010-12-02 5:07 ` oom is broken in mmotm 2010-11-09-15-31 tree? caiqian
2010-12-02 5:12 ` Linus Torvalds
2010-12-02 6:40 ` CAI Qian
2010-12-02 6:48 ` CAI Qian
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2010-12-02 3:11 ` caiqian
2010-12-01 2:44 CAI Qian
2010-12-01 19:29 ` CAI Qian
2010-12-01 20:15 ` Linus Torvalds
2010-12-01 21:40 ` Michel Lespinasse
2010-12-02 4:26 ` CAI Qian
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