linux-kernel - Re: Please backport commit 3812c8c8f39 to stable

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Message-ID: <CAM_iQpW4t_jKSCbS5J1N15FFChd=-UK3QOXrjjst64Rqe5KBTw@mail.gmail.com>
Date:	Fri, 3 Oct 2014 11:03:30 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org
Subject: Re: Please backport commit 3812c8c8f39 to stable

On Fri, Oct 3, 2014 at 8:13 AM, Michal Hocko <mhocko@...e.cz> wrote:
>
> That commit fixes an OOM deadlock. Not a soft lockup. Do you have the
> OOM killer report from the log? This would tell us that the killed task
> was indeed sleeping on the lock which is hold by the charger which
> triggered the OOM. I am little bit surprised that I do not see any OOM
> related functions on the stacks (maybe the code is inlined...).


Oh, did you see __mem_cgroup_try_charge() calls
schedule_timeout_uninterruptible() in stack trace? Yes, they are inlined
and I don't see any other possibilities for calling it.

>
> It would be better to know what exactly is going on before backporting
> this change because it is quite large.
>

I thought the stack trace I showed is obvious. :) I am very happy
to investigate if you see any other path calling
schedule_timeout_uninterruptible()
in __mem_cgroup_try_charge().
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