linux-kernel - Re: x86-64 sporadic hang in 2.6.23rc7 and 2.6.22

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Message-ID: <47062A03.1000603@aitel.hist.no>
Date:	Fri, 05 Oct 2007 14:11:47 +0200
From:	Helge Hafting <helge.hafting@...el.hist.no>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: Re: x86-64 sporadic hang in  2.6.23rc7 and 2.6.22

Andi Kleen wrote:
> Helge Hafting <helge.hafting@...el.hist.no> writes:
>   
>> shrink_dcache_memory
>>     
>
> That usually means random memory corruption from somewhere -- dcache
> tends to use a lot of memory and when it is corrupted anywhere these 
> functions tend to crash while walking the lists. 
>
> Unfortunately memory corruption is hard to track down because
> the messenger is usually not the one to blame.
>
> Perhaps enable slab debugging and see if it turns
> something up. Could be also broken hardware. Does an older kernel
> run stable? If yes and if it can be reproduced bisecting would
> be good.
>   
I attempted bisecting - and failed. The problem is that
2.6.23rc7 seems very unstable, but 2.6.22rc4 is much better
but not perfect. 2.6.22rc4 only crashed once - it can compile for
hours and swap lots and keep running. But it died at least once.

I'll try running recent kernels with more debugging instead.
I think I used SLUB instead of SLAB - either way I can switch
that over to see if it changes things.

Helge Hafting

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