linux-kernel - Re: 2.6.{26.2,27-rc} oops on virtualbox

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Message-ID: <48AEFDF6.7020504@zytor.com>
Date:	Fri, 22 Aug 2008 10:57:10 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.{26.2,27-rc} oops on virtualbox

Mathieu Desnoyers wrote:
> 
> The patch which turns on this bug this this important change to the
> apply paravirt : it disables interrupts _near_ the code patching,
> _within_ the loop. Before, interrupts were disabled outside of the loop.
> It needs to disable interrupts within the loop to be able to use vmap in
> text_poke().
> 
> So I bet VirtualBox has a race in the way it handles interrupt
> disabling.
> 

That seems a bit far-fetched.  The fault is in an initcall, and there 
are no interrupts involved.  Perhaps VirtualBox doesn't manage its 
tcache correctly, but I don't see this as being interrupt-related.

	-hpa
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