linux-kernel - Re: [patch 0/7] improve memcg oom killer robustness v2

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Message-ID: <20130904115741.GA28285@dhcp22.suse.cz>
Date:	Wed, 4 Sep 2013 13:57:41 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	azurIt <azurit@...ox.sk>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, cgroups@...r.kernel.org, x86@...nel.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 0/7] improve memcg oom killer robustness v2

On Wed 04-09-13 11:45:23, azurIt wrote:
[...]
> My script has just detected (and killed) another freezed cgroup. I
> must say that i'm not 100% sure that cgroup was really freezed but it
> has 99% or more memory usage for at least 30 seconds (well, or it has
> 99% memory usage in both two cases the script was checking it). Here
> are stacks of processes inside it before they were killed:
[...]
> pid: 26536
> stack:
> [<ffffffff81080a45>] refrigerator+0x95/0x160
> [<ffffffff8106ac2b>] get_signal_to_deliver+0x1cb/0x540
> [<ffffffff8100188b>] do_signal+0x6b/0x750
> [<ffffffff81001fc5>] do_notify_resume+0x55/0x80
> [<ffffffff815cb662>] retint_signal+0x3d/0x7b
> [<ffffffffffffffff>] 0xffffffffffffffff

[...]

This task is sitting in the refigerator which means it has been frozen
by the freezer cgroup most probably. I am not familiar with the
implementation but my recollection is that you have to thaw that group
in order the killed process can pass away.
-- 
Michal Hocko
SUSE Labs
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