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Date: Tue, 3 Sep 2013 16:48:50 -0400
From: Johannes Weiner <hannes@cmpxchg.org>
To: azurIt <azurit@pobox.sk>
Cc: Andrew Morton <akpm@linux-foundation.org>, Michal Hocko <mhocko@suse.cz>,
        David Rientjes <rientjes@google.com>,
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        linux-kernel@vger.kernel.org
Subject: Re: [patch 0/7] improve memcg oom killer robustness v2
Message-ID: <20130903204850.GA1412@cmpxchg.org>
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 <20130803170831.GB23319@cmpxchg.org>
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Hello azur,

On Mon, Sep 02, 2013 at 12:38:02PM +0200, azurIt wrote:
> >>Hi azur,
> >>
> >>here is the x86-only rollup of the series for 3.2.
> >>
> >>Thanks!
> >>Johannes
> >>---
> >
> >
> >Johannes,
> >
> >unfortunately, one problem arises: I have (again) cgroup which cannot be deleted :( it's a user who had very high memory usage and was reaching his limit very often. Do you need any info which i can gather now?

Did the OOM killer go off in this group?

Was there a warning in the syslog ("Fixing unhandled memcg OOM
context")?

If it happens again, could you check if there are tasks left in the
cgroup?  And provide /proc/<pid>/stack of the hung task trying to
delete the cgroup?

> Now i can definitely confirm that problem is NOT fixed :( it happened again but i don't have any data because i already disabled all debug output.

Which debug output?

Do you still have access to the syslog?

It's possible that, as your system does not deadlock on the OOMing
cgroup anymore, you hit a separate bug...

Thanks!

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [patch 0/7] improve memcg oom killer robustness v2
Date: Tue, 3 Sep 2013 16:48:50 -0400
Message-ID: <20130903204850.GA1412@cmpxchg.org>
References: <1375549200-19110-1-git-send-email-hannes@cmpxchg.org>
 <20130803170831.GB23319@cmpxchg.org>
 <20130830215852.3E5D3D66@pobox.sk>
 <20130902123802.5B8E8CB1@pobox.sk>
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To: azurIt <azurit@pobox.sk>
Cc: Andrew Morton <akpm@linux-foundation.org>, Michal Hocko <mhocko@suse.cz>, 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
List-Id: linux-arch.vger.kernel.org

Hello azur,

On Mon, Sep 02, 2013 at 12:38:02PM +0200, azurIt wrote:
> >>Hi azur,
> >>
> >>here is the x86-only rollup of the series for 3.2.
> >>
> >>Thanks!
> >>Johannes
> >>---
> >
> >
> >Johannes,
> >
> >unfortunately, one problem arises: I have (again) cgroup which cannot be deleted :( it's a user who had very high memory usage and was reaching his limit very often. Do you need any info which i can gather now?

Did the OOM killer go off in this group?

Was there a warning in the syslog ("Fixing unhandled memcg OOM
context")?

If it happens again, could you check if there are tasks left in the
cgroup?  And provide /proc/<pid>/stack of the hung task trying to
delete the cgroup?

> Now i can definitely confirm that problem is NOT fixed :( it happened again but i don't have any data because i already disabled all debug output.

Which debug output?

Do you still have access to the syslog?

It's possible that, as your system does not deadlock on the OOMing
cgroup anymore, you hit a separate bug...

Thanks!

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