From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Hajnoczi <stefanha@gmail.com>
Subject: Re: A non-responsive guest problem
Date: Mon, 22 Aug 2011 13:10:05 +0100
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On Mon, Aug 22, 2011 at 10:37 AM, Paul <flypen@gmail.com> wrote:
> Hi,
> I found the clock of guest OS has been changed. For example, today was Aug
> 22, but I found the time of guest was Mar 22 from the VNC desktop. The clock
> source of guest was kvm-clock. Was it related to KVM clock bug? How about it
> if I changed the clock to tsc?

If the guest is using 100% CPU but the kernel is still responsive at
some level you can use SysRq to gather information:
http://en.wikipedia.org/wiki/Magic_SysRq_key

Especially Alt+SysRQ+t is interesting because it prints the current
tasks to the console.

If you are able to get interactive access again then top(1) would be
interesting.

Stefan