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

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Message-Id: <20080229032902.a1a235df.akpm@linux-foundation.org>
Date:	Fri, 29 Feb 2008 03:29:02 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jiri Olsa <olsajiri@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] soft lockup detected with ipcs

On Fri, 29 Feb 2008 12:01:27 +0100 Jiri Olsa <olsajiri@...il.com> wrote:

> Andrew Morton wrote:
> > On Fri, 29 Feb 2008 11:46:24 +0100 Jiri Olsa <olsajiri@...il.com> 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.
> > 
> > how weird.  Lots of people are surely running ipcs and not seeing this.
> > 
> > Can you suggest what's different about your setup?
>
> no idea :) I noticed like 2 weeks ago... I probably changed some config,
> but I dont remember what it was, I'll try to figure out.
> 
> Anyway I can reproduce this immediatelly, so I can run any diag you'd need to see.
> 

(reversed top-posting - please don't do that ;))

Strange.  I guess as a first step it would be good if you can get a full
backtrace - can you set up netconsole
(Documentation/networking/netconsole.txt) and grab that?

We have your config.  Can you tell us how you're triggering it?  Does a
particular workload have to be run, or is it triggerable straight after
bootup?

Thanks.
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