linux-kernel - Re: [PATCH?] race between cgroup_subsys->fork() and cgroup

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Message-ID: <20151125195410.GD14240@htj.duckdns.org>
Date:	Wed, 25 Nov 2015 14:54:10 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Aleksa Sarai <cyphar@...har.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Li Zefan <lizefan@...wei.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH?] race between cgroup_subsys->fork() and cgroup_migrate()

On Wed, Nov 25, 2015 at 02:51:38PM -0500, Tejun Heo wrote:
> Sounds perfect.  As this needs to go through -stable, can you please
> resend the patch with proper description and SOB?  Please also update
> the now incorrect comment in can_attach.

Ooh, the patch triggers RCU warning from task_css().  It's spurious
and I think the right thing to do at least for now is using
task_css_check() and explain what's going on.

Thanks.

-- 
tejun
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