Re: [RFC PATCH v2 07/17] cgroup: Prevent kill_css() from being called more than once

[Waiman Long]

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@xxxxxxxxxx>
> 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