linux-kernel - Re: [PATCH] mm: memcontrol: fix possible css ref leak on oom

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Message-ID: <20160530072628.GG22928@dhcp22.suse.cz>
Date:	Mon, 30 May 2016 09:26:28 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: memcontrol: fix possible css ref leak on oom

On Fri 27-05-16 13:36:29, Johannes Weiner wrote:
> On Mon, May 23, 2016 at 07:02:10PM +0300, Vladimir Davydov wrote:
> > mem_cgroup_oom may be invoked multiple times while a process is handling
> > a page fault, in which case current->memcg_in_oom will be overwritten
> > leaking the previously taken css reference.
> 
> There is a task_in_memcg_oom() check before calling mem_cgroup_oom().
> 
> How can this happen?

Ble, I have missed that... Thanks for pointing that out

-- 
Michal Hocko
SUSE Labs