linux-kernel - Re: [pre-2.6.23 REGRESSION] 2.6.23-rc3-git1 crash/stuck on VIA CN700 system

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Message-ID: <20070905163724.GC31880@one.firstfloor.org>
Date:	Wed, 5 Sep 2007 18:37:24 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Stefan Becker <Stefan.Becker@...ia.com>
Cc:	ext Andi Kleen <andi@...stfloor.org>,
	ext Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [pre-2.6.23 REGRESSION] 2.6.23-rc3-git1 crash/stuck on VIA CN700 system

> flags		: fpu vme de pse tsc msr pae mce cx8 apic mtrr pge cmov pat 
> clflush acpi mmx fxsr sse sse2 tm up pni est tm2 rng rng_en ace ace_en 

Hmm, I can't really see anything wrong. This means the original
version of the patch you found had a few problems, but they
were all fixed later and only applied with CONFIG_PARAVIRT enabled anyways.

As a stab in the dark since the CPU has clflush can you please 
comment out the  

  if (cpu_has_clflush)
                asm("clflush (%0) " :: "r" (addr) : "memory");

statement in arch/i386/kernel/alternative.c and see if it makes a difference?
Perhaps your CPU doesn't like that (it seems to have clflush) 

If that doesn't help it might be needed to revert the patch
hunk by hunk to see which text_poke() invocation caused it.

-Andi
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