Date: Thu, 26 Nov 2015 17:01:37 +0100
From: Oleg Nesterov <oleg@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: Aleksa Sarai <cyphar@cyphar.com>, Johannes Weiner <hannes@cmpxchg.org>,
        Li Zefan <lizefan@huawei.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH?] race between cgroup_subsys->fork() and
	cgroup_migrate()
Message-ID: <20151126160137.GB23581@redhat.com>
References: <20151125163427.GA8139@redhat.com> <20151125195138.GC14240@htj.duckdns.org> <20151125195410.GD14240@htj.duckdns.org> <20151125204057.GF14240@htj.duckdns.org>
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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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