From: Tejun Heo <tj@kernel.org>
To: Mandeep Singh Baines <msb@chromium.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>,
linux-kernel@vger.kernel.org,
containers@lists.linux-foundation.org, cgroups@vger.kernel.org,
stable@kernel.org,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Oleg Nesterov <oleg@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Paul Menage <paul@paulmenage.org>,
Olof Johansson <olofj@chromium.org>
Subject: Re: [PATCH] cgroups: fix a css_set not found bug in cgroup_attach_proc
Date: Thu, 15 Dec 2011 13:23:29 -0800 [thread overview]
Message-ID: <20111215212329.GH32002@google.com> (raw)
In-Reply-To: <1323977803-5385-1-git-send-email-msb@chromium.org>
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
next prev parent reply other threads:[~2011-12-15 21:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-15 19:36 [PATCH] cgroups: fix a css_set not found bug in cgroup_attach_proc Mandeep Singh Baines
2011-12-15 21:23 ` Tejun Heo [this message]
2011-12-16 2:12 ` Li Zefan
2011-12-19 17:13 ` Tejun Heo
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