This was discussed on the mailing list earlier I believe:

http://www.mail-archive.com/openstack@lists.launchpad.net/msg08475.html

The solution appears to be to upgrade to a newer libvirt.

Vish

On Mar 28, 2012, at 6:01 AM, Guilherme Birk wrote:

> No one is having this issue?
> 
> From: guib...@hotmail.com
> To: openstack@lists.launchpad.net
> Date: Fri, 23 Mar 2012 19:48:04 +0000
> Subject: [Openstack] KVM crash.
> 
> I'm having problems with KVM on a single node installation. My problem is 
> like these ones: 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=42703
> http://www.spinics.net/lists/kvm/msg67635.html
> 
> The KVM normally crashes when I'm doing a load test with a large number of 
> connections on the VM's.
> 
> This appears to not happen using a dual node installation, with the 
> nova-compute running with a dedicated machine.
> 
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