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

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Message-ID: <47C7EDE4.9040909@gmail.com>
Date:	Fri, 29 Feb 2008 12:35:00 +0100
From:	Jiri Olsa <olsajiri@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] soft lockup detected with ipcs

Andrew Morton wrote:
> 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.

I'll try to get the netconsole..

The trigger is simple just type ipcs and press enter :)
I noticed that running from xterm freeze all the time.
It wont freeze up sometimes running directly from terminal.

I also tried to reproduce it in qemu but with no luck.
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