linux-kernel - Re: [PATCH] cgroup: avoid attaching a cgroup root to two different superblocks, take 2

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Message-ID: <20170428220720.GJ22354@htj.duckdns.org>
Date:   Fri, 28 Apr 2017 18:07:20 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Zefan Li <lizefan@...wei.com>
Cc:     avagin@...tuozzo.com, Dmitry Vyukov <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, take 2

On Wed, Apr 19, 2017 at 10:15:59AM +0800, Zefan Li wrote:
> Commit bfb0b80db5f9 is broken. Now we try to fix the race by delaying
> the initialization of cgroup root refcnt until a superblock has been
> allocated.
>
> Cc: stable@...r.kernel.org # 3.16+
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> Reported-by: Andrei Vagin <avagin@...tuozzo.com>
> Tested-by: Andrei Vagin <avagin@...tuozzo.com>
> Signed-off-by: Zefan Li <lizefan@...wei.com>

Applied to cgroup/for-4.12 w/o the stable tag.  Let's wait this one
out.  It's unlikely to trigger in real use cases and if we decide that
this needs to be in -stable, we can ask Greg later.

> Again I didn't receive your reply. I believe the problem is in my side.
> I'll see if there's some network administrator who can look into this
> issue, but I don't have much hope...

Bummer.  Is there another address I can cc? :(

Thanks.

-- 
tejun