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Date: Wed, 4 Sep 2013 13:57:41 +0200
From: Michal Hocko <mhocko@suse.cz>
To: azurIt <azurit@pobox.sk>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
        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
Message-ID: <20130904115741.GA28285@dhcp22.suse.cz>
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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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