linux-kernel - Re: 3.10.16 cgroup css_set

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Message-ID: <20131115081929.GA11530@mtj.dyndns.org>
Date:	Fri, 15 Nov 2013 17:19:29 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Shawn Bohrer <shawn.bohrer@...il.com>
Cc:	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Li Zefan <lizefan@...wei.com>
Subject: Re: 3.10.16 cgroup css_set_lock deadlock

On Thu, Nov 14, 2013 at 05:25:29PM -0600, Shawn Bohrer wrote:
> In trying to reproduce the cgroup_mutex deadlock I reported earlier
> in https://lkml.org/lkml/2013/11/11/574 I believe I encountered a
> different issue that I'm also unable to understand. This machine
> started out reporting some soft lockups that look to me like they are
> on a read_lock(css_set_lock):
> 
...
> RIP: 0010:[<ffffffff8109253c>]  [<ffffffff8109253c>] cgroup_attach_task+0xdc/0x7a0
...
>  [<ffffffff81092e87>] attach_task_by_pid+0x167/0x1a0
>  [<ffffffff81092ef3>] cgroup_tasks_write+0x13/0x20

Most likely the bug fixed by ea84753c98a7 ("cgroup: fix to break the
while loop in cgroup_attach_task() correctly").  3.10.19 contains the
backported fix.

Thanks.

-- 
tejun
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