From: "azurIt" <azurit@pobox.sk>
To: "Johannes Weiner" <hannes@cmpxchg.org>
Cc: "Michal Hocko" <mhocko@suse.cz>,
"Andrew Morton" <akpm@linux-foundation.org>,
"David Rientjes" <rientjes@google.com>,
"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>,
"KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>,
linux-mm@kvack.org, cgroups@vger.kernel.org, x86@kernel.org,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [patch 0/7] improve memcg oom killer robustness v2
Date: Fri, 11 Oct 2013 00:59:45 +0200 [thread overview]
Message-ID: <20131011005945.33D49C21@pobox.sk> (raw)
In-Reply-To: <20131010001422.GB856@cmpxchg.org>
>On Wed, Oct 09, 2013 at 08:44:50PM +0200, azurIt wrote:
>> Joahnnes,
>>
>> i'm very sorry to say it but today something strange happened.. :) i was just right at the computer so i noticed it almost immediately but i don't have much info. Server stoped to respond from the net but i was already logged on ssh which was working quite fine (only a little slow). I was able to run commands on shell but i didn't do much because i was afraid that it will goes down for good soon. I noticed few things:
>> - htop was strange because all CPUs were doing nothing (totally nothing)
>> - there were enough of free memory
>> - server load was about 90 and was raising slowly
>> - i didn't see ANY process in 'run' state
>> - i also didn't see any process with strange behavior (taking much CPU, memory or so) so it wasn't obvious what to do to fix it
>> - i started to kill Apache processes, everytime i killed some, CPUs did some work, but it wasn't fixing the problem
>> - finally i did 'skill -kill apache2' in shell and everything started to work
>> - server monitoring wasn't sending any data so i have no graphs
>> - nothing interesting in logs
>>
>> I will send more info when i get some.
>
>Somebody else reported a problem on the upstream patches as well. Any
>chance you can confirm the stacks of the active but not running tasks?
Unfortunately i don't have any stacks but i will try to take some next time.
>It sounds like they are stuck on a waitqueue, the question is which
>one. I forgot to disable OOM for __GFP_NOFAIL allocations, so they
>could succeed and leak an OOM context. task structs are not
>reinitialized between alloc & free so a different task could later try
>to oom trylock a memcg that has been freed, fail, and wait
>indefinitely on the OOM waitqueue. There might be a simpler
>explanation but I can't think of anything right now.
>
>But the OOM context is definitely being leaked, so please apply the
>following for your next reboot:
It's installed, thank you!
azur
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next prev parent reply other threads:[~2013-10-10 22:59 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-03 16:59 Johannes Weiner
2013-08-03 16:59 ` [patch 1/7] arch: mm: remove obsolete init OOM protection Johannes Weiner
2013-08-06 6:34 ` Vineet Gupta
2013-08-03 16:59 ` [patch 2/7] arch: mm: do not invoke OOM killer on kernel fault OOM Johannes Weiner
2013-08-03 16:59 ` [patch 3/7] arch: mm: pass userspace fault flag to generic fault handler Johannes Weiner
2013-08-05 22:06 ` Andrew Morton
2013-08-05 22:25 ` Johannes Weiner
2013-08-03 16:59 ` [patch 4/7] x86: finish user fault error path with fatal signal Johannes Weiner
2013-08-03 16:59 ` [patch 5/7] mm: memcg: enable memcg OOM killer only for user faults Johannes Weiner
2013-08-05 9:18 ` Michal Hocko
2013-08-03 16:59 ` [patch 6/7] mm: memcg: rework and document OOM waiting and wakeup Johannes Weiner
2013-08-03 17:00 ` [patch 7/7] mm: memcg: do not trap chargers with full callstack on OOM Johannes Weiner
2013-08-05 9:54 ` Michal Hocko
2013-08-05 20:56 ` Johannes Weiner
2013-08-03 17:08 ` [patch 0/7] improve memcg oom killer robustness v2 Johannes Weiner
2013-08-09 9:06 ` azurIt
2013-08-30 19:58 ` azurIt
2013-09-02 10:38 ` azurIt
2013-09-03 20:48 ` Johannes Weiner
2013-09-04 7:53 ` azurIt
2013-09-04 8:18 ` azurIt
2013-09-05 11:54 ` Johannes Weiner
2013-09-05 12:43 ` Michal Hocko
2013-09-05 16:18 ` Johannes Weiner
2013-09-09 12:36 ` Michal Hocko
2013-09-09 12:56 ` Michal Hocko
2013-09-12 12:59 ` Johannes Weiner
2013-09-16 14:03 ` Michal Hocko
2013-09-05 13:24 ` Michal Hocko
2013-09-09 13:10 ` azurIt
2013-09-09 17:28 ` Johannes Weiner
2013-09-09 19:59 ` azurIt
2013-09-09 20:12 ` Johannes Weiner
2013-09-09 20:18 ` azurIt
2013-09-09 21:08 ` azurIt
2013-09-10 18:13 ` azurIt
2013-09-10 18:37 ` Johannes Weiner
2013-09-10 19:32 ` azurIt
2013-09-10 20:12 ` Johannes Weiner
2013-09-10 21:08 ` azurIt
2013-09-10 21:18 ` Johannes Weiner
2013-09-10 21:32 ` azurIt
2013-09-10 22:03 ` Johannes Weiner
2013-09-11 12:33 ` azurIt
2013-09-11 18:03 ` Johannes Weiner
2013-09-11 18:54 ` azurIt
2013-09-11 19:11 ` Johannes Weiner
2013-09-11 19:41 ` azurIt
2013-09-11 20:04 ` Johannes Weiner
2013-09-14 10:48 ` azurIt
2013-09-16 13:40 ` Michal Hocko
2013-09-16 14:01 ` azurIt
2013-09-16 14:06 ` Michal Hocko
2013-09-16 14:13 ` azurIt
2013-09-16 14:57 ` Michal Hocko
2013-09-16 15:05 ` azurIt
2013-09-16 15:17 ` Johannes Weiner
2013-09-16 15:24 ` azurIt
2013-09-16 15:25 ` Michal Hocko
2013-09-16 15:40 ` azurIt
2013-09-16 20:52 ` azurIt
2013-09-17 0:02 ` Johannes Weiner
2013-09-17 11:15 ` azurIt
2013-09-17 14:10 ` Michal Hocko
2013-09-18 14:03 ` azurIt
2013-09-18 14:24 ` Michal Hocko
2013-09-18 14:33 ` azurIt
2013-09-18 14:42 ` Michal Hocko
2013-09-18 18:02 ` azurIt
2013-09-18 18:36 ` Michal Hocko
[not found] ` <20130918160304.6EDF2729-Rm0zKEqwvD4@public.gmane.org>
2013-09-18 18:04 ` Johannes Weiner
[not found] ` <20130918180455.GD856-druUgvl0LCNAfugRpC6u6w@public.gmane.org>
2013-09-18 18:19 ` Johannes Weiner
2013-09-18 19:55 ` Johannes Weiner
2013-09-18 20:52 ` azurIt
2013-09-25 7:26 ` azurIt
2013-09-26 16:54 ` azurIt
2013-09-26 19:27 ` Johannes Weiner
2013-09-27 2:04 ` azurIt
2013-10-07 11:01 ` azurIt
[not found] ` <20131007130149.5F5482D8-Rm0zKEqwvD4@public.gmane.org>
2013-10-07 19:23 ` Johannes Weiner
2013-10-09 18:44 ` azurIt
2013-10-10 0:14 ` Johannes Weiner
2013-10-10 22:59 ` azurIt [this message]
2013-09-17 11:20 ` azurIt
2013-09-16 10:22 ` azurIt
2013-09-04 9:45 ` azurIt
2013-09-04 11:57 ` Michal Hocko
2013-09-04 12:10 ` azurIt
2013-09-04 12:26 ` Michal Hocko
2013-09-04 12:39 ` azurIt
2013-09-05 9:14 ` azurIt
2013-09-05 9:53 ` Michal Hocko
2013-09-05 10:17 ` azurIt
2013-09-05 11:17 ` Michal Hocko
2013-09-05 11:47 ` azurIt
2013-09-05 12:03 ` Michal Hocko
2013-09-05 12:33 ` azurIt
2013-09-05 12:45 ` Michal Hocko
2013-09-05 13:00 ` azurIt
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