From: Rik van Riel <riel@redhat.com>
To: Udo van den Heuvel <udovdh@xs4all.nl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: BUG or virtualbox issue?
Date: Fri, 26 Dec 2008 14:42:03 -0500 [thread overview]
Message-ID: <4955338B.2010804@redhat.com> (raw)
In-Reply-To: <4954C095.3080300@xs4all.nl>
Udo van den Heuvel wrote:
> Hello,
>
> Just started virtualbox for the first time on x86_64 Phenom system; is
> this a kernel issue or something for the VirtualBox people?
>
> Dec 26 12:20:01 surfplank2 kernel: BUG: using smp_processor_id() in
> preemptible [00000000] code: VirtualBox/26774
> Dec 26 12:20:01 surfplank2 kernel: caller is RTMpCpuId+0x9/0x10 [vboxdrv]
> Dec 26 12:20:01 surfplank2 kernel: Pid: 26774, comm: VirtualBox Not
> tainted 2.6.28 #3
Looks like the virtualbox code forgot to switch off
preemption before calling smp_processor_id().
This is broken, because the thread could get de-scheduled
and re-scheduled onto another CPU, which means the code
could end up using the wrong smp processor ID.
--
All rights reversed.
prev parent reply other threads:[~2008-12-26 19:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-26 11:31 BUG or virtualbox issue? Udo van den Heuvel
2008-12-26 19:42 ` Rik van Riel [this message]
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