From mboxrd@z Thu Jan  1 00:00:00 1970
From: mingo@elte.hu (Ingo Molnar)
Date: Wed, 11 Feb 2009 20:50:38 +0100
Subject: [ltt-dev] [BUG] Linux 2.6.28.4 freezing on a 32-bits x86
	Thinkpad T43p
In-Reply-To: <20090211193125.GA30975@Krystal>
References: <20090204211106.GA30824@Krystal> <20090204211759.GK22608@elte.hu>
	<20090211193125.GA30975@Krystal>
Message-ID: <20090211195038.GC25968@elte.hu>


* Mathieu Desnoyers <mathieu.desnoyers at polymtl.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