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

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Message-ID: <20080622095049.GB7285@cvg>
Date:	Sun, 22 Jun 2008 13:50:49 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Vegard Nossum <vegard.nossum@...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

[Vegard Nossum - Sun, Jun 22, 2008 at 11:42:50AM +0200]
| 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
| 

Thanks Vegard,

actually i'm not that spec in this area ;) but will take a look

		- Cyrill -
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