From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tetsuo Handa <penguin-kernel-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>
Subject: Re: WARNING in handle_mm_fault
Date: Wed, 25 Nov 2015 19:51:13 +0900
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To: Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Dmitry Vyukov <dvyukov-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Cc: Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, "linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org" <linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, syzkaller <syzkaller-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>, Kostya Serebryany <kcc-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Alexander Potapenko <glider-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Sasha Levin <sasha.levin-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>, Eric Dumazet <edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Greg Thelen <gthelen-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>

On 2015/11/25 17:44, Michal Hocko wrote:
> Sasha has reported the same thing some time ago
> http://www.spinics.net/lists/cgroups/msg14075.html. Tejun had a theory
> http://www.spinics.net/lists/cgroups/msg14078.html but we never got down
> to the solution.

Did you check assembly code?
https://gcc.gnu.org/ml/gcc/2012-02/msg00005.html