Message-ID: <48AEFDF6.7020504@zytor.com>
Date: Fri, 22 Aug 2008 10:57:10 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: "Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br>,
       Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.{26.2,27-rc} oops on virtualbox
References: <20080820162925.75a5e064@doriath.conectiva> <48ADDF4F.2020401@zytor.com> <48AE5FCF.6030103@zytor.com> <20080822065012.GV14110@elte.hu> <20080822113941.147a1db0@doriath.conectiva> <20080822153451.GA8390@Krystal> <20080822132948.57e47076@doriath.conectiva> <48AEF457.5020100@zytor.com> <20080822174529.GA13020@Krystal>
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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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