linux-kernel - Re: [PATCH] cgroup: avoid attaching a cgroup root to two different superblocks

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Message-ID: <20170411000123.GC28603@wtj.duckdns.org>
Date:   Tue, 11 Apr 2017 09:01:23 +0900
From:   Tejun Heo <tj@...nel.org>
To:     Zefan Li <lizefan@...wei.com>
Cc:     dvyukov@...gle.com, LKML <linux-kernel@...r.kernel.org>,
        Cgroups <cgroups@...r.kernel.org>
Subject: Re: [PATCH] cgroup: avoid attaching a cgroup root to two different
 superblocks

On Fri, Apr 07, 2017 at 04:51:55PM +0800, Zefan Li wrote:
> We end up using the same cgroup root for two different superblocks,
> so percpu_ref_kill() will be called twice on the same root when the
> two superblocks are destroyed.
> 
> We should fix to make sure the superblock pinning is really successful.
> 
> Cc: stable@...r.kernel.org # 3.16+
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> Signed-off-by: Zefan Li <lizefan@...wei.com>

Applied to cgroup/for-4.11-fixes.

Thanks.

-- 
tejun