linux-kernel - Re: v2.6.26-rc7/cgroups: circular locking dependency

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Message-ID: <19f34abd0806220242p62b9a044la6dd8843e5055f84@mail.gmail.com>
Date:	Sun, 22 Jun 2008 11:42:50 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Cyrill Gorcunov" <gorcunov@...il.com>
Cc:	"Paul Menage" <menage@...gle.com>,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: v2.6.26-rc7/cgroups: circular locking dependency

On Sun, Jun 22, 2008 at 11:10 AM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> [Vegard Nossum - Sat, Jun 21, 2008 at 07:38:59PM +0200]
> |  =======================================================
> |  [ INFO: possible circular locking dependency detected ]
> |  2.6.26-rc7 #25
> |  -------------------------------------------------------
> |  bash/10032 is trying to acquire lock:
> |   (&cpu_hotplug.lock){--..}, at: [<c015efbc>] get_online_cpus+0x2c/0x40
> |
> |  but task is already holding lock:
> |   (cgroup_mutex){--..}, at: [<c0160e6f>] cgroup_lock+0xf/0x20

...

> Hi Vegard,
>
> would be interesting to see your config please

Here is my config and vmlinux:

http://www.kernel.org/pub/linux/kernel/people/vegard/kernels/20080621-v2.6.26-rc7/

By the way, I was doing CPU hotplug/unplug at the time.

Thanks :)


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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