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

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Message-ID: <20090211195038.GC25968@elte.hu>
Date:	Wed, 11 Feb 2009 20:50:38 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
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


* 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
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