linux-kernel - Re: [BUG] Linux 2.6.28.4 freezing on a 32-bits x86 Thinkpad T43p

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Message-ID: <20090211201349.GB32122@Krystal>
Date:	Wed, 11 Feb 2009 15:13:49 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Avi Kivity <avi@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, Greg KH <greg@...ah.com>,
	ltt-dev@...ts.casi.polymtl.ca, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [BUG] Linux 2.6.28.4 freezing on a 32-bits x86 Thinkpad T43p

* Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> 
> > Here is a new backtrace, taken with a huge amount of debugging active, which still 
> > points to an interrupt handler nested over kvm_mmu_pte_write as the culprit. It's 
> > weird that the kvm code gets called on my modest Pentium M laptop, which I think 
> > has no VT-x support at all. I am not running any KVM VMs on this machine. The 
> > problem still happens on 2.6.28.4, and Slub redzones did not identify any memory 
> > corruption. This could be due to kvm_mmu_pte_write which either should not be 
> > called at all, or due to improper interrupt disabling in this function.
> 
> Does latest tip:master fix it? In particular this one:
> 
>   9cf161a: x86/cpa: make sure cpa is safe to call in lazy mmu mode
> 
> fixes a crasher related to KVM and mmu notifiers ...
> 
> 	Ingo

I'll try to apply commit 
9cf161a: x86/cpa: make sure cpa is safe to call in lazy mmu mode

To my 2.6.28.4 kernel to change the configuration minimally and see if
it helps. I guess we'll have to wait a few days before the problem is
reproduced, and even more if it's not. :)

Thanks a lot!

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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