linux-kernel - Re: [BUG] soft lockup detected with ipcs

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Message-ID: <Pine.LNX.4.64.0802291241080.7699@twin.jikos.cz>
Date:	Fri, 29 Feb 2008 12:43:19 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Jiri Olsa <olsajiri@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] soft lockup detected with ipcs

On Fri, 29 Feb 2008, Jiri Olsa wrote:

> when I run 'ipcs' my system freeze up immediatelly. I was able to get 
> kernel BUG message once, I think it is not printed out all the time it 
> freeze.
> I tried on 2.6.24, 2.6.20 and 2.6.18.
> I attached screenshot from 2.6.18 freeze and config.

Could you please turn all the lock debugging options in your .config on 
(most importantly CONFIG_PROVE_LOCKING, and all the other lock debugging 
options might come handy too) and try again, to see if we get any debug 
error messages? I'd guess that someone is holding mqueue_inode_info->lock 
for too long or there is some AB-BA deadlock on it, which lockdep and 
friends might be able to diagnose.

-- 
Jiri Kosina
SUSE Labs

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