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

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Message-ID: <20151126160137.GB23581@redhat.com>
Date:	Thu, 26 Nov 2015 17:01:37 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
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 11/25, Tejun Heo wrote:
>
> And I spotted a bug in cgroup core in controller enable path.  While
> the race between fork and attach exists and needs to be fixed, I think
> the cgroup core bug is the main source of discrepancy.  Will update
> once I learn more.

OK. I do not know what exactly do you mean, perhaps if you fix this problem
the race between fork and attach goes away and in this case the fix I sent
is not needed? I'll wait for more info.

Oleg.

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