On Thu, Dec 15, 2011 at 11:36:43AM -0800, Mandeep Singh Baines wrote:
> There is a BUG when migrating a PF_EXITING proc. Since css_set_prefetch()
> is not called for the PF_EXITING case, find_existing_css_set() will return
> NULL inside cgroup_task_migrate() causing a BUG.
>
> This bug is easy to reproduce. Create a zombie and echo its pid to
> cgroup.procs.
>
> $ cat zombie.c
> \#include <unistd.h>
>
> int main()
> {
> if (fork())
> pause();
> return 0;
> }
> $
>
> We are hitting this bug pretty regularly on ChromeOS.
>
> This bug is already fixed by Tejun Heo's cgroup patchset which is
> targetted for the next merge window:
>
> https://lkml.org/lkml/2011/11/1/356
>
> I've create a smaller patch here which just fixes this bug so that a
> fix can be merged into the current release and stable.
Looks safe to me. Li?
Thanks.
--
tejun
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