Brian Mathis wrote:
On Mon, Oct 3, 2011 at 10:16 PM, Negative negativebinomial@gmail.com wrote:
I built guest vm's one for Windows 7 and one for Windows XP using the virtual machine manager on a  just updated to centos 5.7, and they are both crashing the host machine. They run only  for a few minutes, but suddenly freeze, crashing the host.  There is no networking. No X. No way to drop out of X. The only way out is a hard reboot. I don't see anything in the logs -- messages or libvirt logs -- immediately before the crash.
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Is this new hardware? Have you run any hardware burn testing (CPU, RAM, etc...) and/or memtest86+ on the RAM? This sounds like a hardware issue to me.
I agree with Brian - it may be coincidental that you built the VMs, and then it started crashing.
One other question: is selinux enabled?
mark