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

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Message-ID: <4DE61A2B.7000008@fnarfbargle.com>
Date:	Wed, 01 Jun 2011 18:53:31 +0800
From:	Brad Campbell <lists2009@...rfbargle.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, linux-mm <linux-mm@...ck.org>
Subject: Re: KVM induced panic on 2.6.38[2367] & 2.6.39

On 01/06/11 17:41, Avi Kivity wrote:
> On 06/01/2011 12:40 PM, Avi Kivity wrote:
>>
>> bridge and netfilter, IIRC this was also the problem last time.
>>
>> Do you have any ebtables loaded?

Never heard of them, but making a cursory check just in case..

brad@srv:/raid10/src/linux-2.6.39$ grep EBTABLE .config
# CONFIG_BRIDGE_NF_EBTABLES is not set

>> Can you try building a kernel without ebtables? Without netfilter at all?

Well, without netfilter I can't get it to crash. The problem is without 
netfilter I can't actually use it the way I use it to get it to crash.

I rebooted into a netfilter kernel, and did all the steps I'd used on 
the no-netfilter kernel and it ticked along happily.

So the result of the experiment is inconclusive. Having said that, the 
backtraces certainly smell networky.

To get it to crash, I have to start IE in the VM and https to the public 
address of the machine, which is then redirected by netfilter back into 
another of the VM's.

I can https directly to the other VM's address, but that does not cause 
it to crash, however without netfilter loaded I can't bounce off the 
public IP. It's all rather confusing really.

What next Sherlock?

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