linux-kernel - Re: KVM induced panic on 2.6.38[2367] & 2.6.39

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Message-ID: <4E51F8D4.5070804@redhat.com>
Date:	Mon, 22 Aug 2011 09:36:04 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Brad Campbell <lists2009@...rfbargle.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>, CaT <cat@....com.au>,
	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: KVM induced panic on 2.6.38[2367] & 2.6.39

On 08/20/2011 04:16 PM, Brad Campbell wrote:
> Author: Alexander Duyck <alexander.h.duyck@...el.com>
> Date:   Thu Jul 1 13:28:27 2010 +0000
>
>     x86: Drop CONFIG_MCORE2 check around setting of NET_IP_ALIGN
>
>     This patch removes the CONFIG_MCORE2 check from around 
> NET_IP_ALIGN.  It is
>     based on a suggestion from Andi Kleen.  The assumption is that 
> there are
>     not any x86 cores where unaligned access is really slow, and this 
> change
>     would allow for a performance improvement to still exist on 
> configurations
>     that are not necessarily optimized for Core 2.
>
>     Cc: Andi Kleen <ak@...ux.intel.com>
>     Cc: Thomas Gleixner <tglx@...utronix.de>
>     Cc: Ingo Molnar <mingo@...hat.com>
>     Cc: "H. Peter Anvin" <hpa@...or.com>
>     Cc: x86@...nel.org
>     Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
>     Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>     Acked-by: H. Peter Anvin <hpa@...or.com>
>     Signed-off-by: David S. Miller <davem@...emloft.net>
>
> :040000 040000 5a15867789080a2f67a74b17c4422f85b7a9fb4a 
> b98769348bd765731ca3ff03b33764257e23226c M    arch
>
> I can confirm this bug exists in the 3.0 kernel, however I'm unable to 
> reproduce it on todays git.
>
> So anyone using netfilter, kvm and bridge on kernels between 
> 2.6.36-rc1 and 3.0 may hit this bug, but it looks like it is fixed in 
> the current 3.1-rc kernels.
>

Thanks for this effort.  I don't think this patch is buggy in itself, it 
merely exposed another bug which was fixed later on.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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