linux-kernel - Re: [RFC PATCH v2 07/17] cgroup: Prevent kill

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Message-ID: <c541638f-b302-8c96-0dcd-f4b758a4a81f@redhat.com>
Date:   Wed, 17 May 2017 16:24:32 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, kernel-team@...com, pjt@...gle.com,
        luto@...capital.net, efault@....de
Subject: Re: [RFC PATCH v2 07/17] cgroup: Prevent kill_css() from being called
 more than once

On 05/17/2017 03:23 PM, Tejun Heo wrote:
> Hello,
>
> On Mon, May 15, 2017 at 09:34:06AM -0400, Waiman Long wrote:
>> The kill_css() function may be called more than once under the condition
>> that the css was killed but not physically removed yet followed by the
>> removal of the cgroup that is hosting the css. This patch prevents any
>> harmm from being done when that happens.
>>
>> Signed-off-by: Waiman Long <longman@...hat.com>
> So, this is a bug fix which isn't really related to this patchset.
> I'm applying it to cgroup/for-4.12-fixes w/ stable cc'd.
>
> Thanks.
>
Actually, this bug can be easily triggered with the resource domain
patch later in the series. I guess it can also happen in the current
code base, but I don't have a test that can reproduce it.

Regards,
Longman