VM Server frozen in time

This time I have a really interesting problem :-)
One of our VM servers began performing really badly and would no longer let us ssh to it. (This also happend to a different server the other day, but we rebooted as there was no time to investigate.)
TOP on the server showed every process using 9999.00 % of the CPU
I ran date several times over the space of a few minutes and got the following -
Tue Aug 17 17:28:15 WST 2010
[root@bart log]# date
Tue Aug 17 17:28:15 WST 2010
[root@bart log]# date
Tue Aug 17 17:28:15 WST 2010
[root@bart log]# date
Tue Aug 17 17:28:15 WST 2010
[root@bart log]# date
Tue Aug 17 17:28:15 WST 2010
[root@bart log]# date
Tue Aug 17 17:28:15 WST 2010
[root@bart log]# hwclock
Wed 18 Aug 2010 09:17:21 AM WST -0.000000 seconds
[root@bart log]# date
Tue Aug 17 17:28:15 WST 2010
[root@bart log]# date
Tue Aug 17 17:28:15 WST 2010
[root@bart log]# date
Tue Aug 17 17:28:15 WST 2010
[root@bart log]# date
Tue Aug 17 17:28:15 WST 2010
It appears from this that our VM Server has stopped time.
We have found the following note -
http://kerneltrap.org/mailarchive/linux-kernel/2007/10/3/328324/thread
but are not sure if this applies to OVM 2.2.1 2.6.18-128.2.1.4.25.el5xen
We have Intel quad core CPU.
Does anyone know if there is a patch for this, and can I get it from the public yum or do I need to get a support contract?
Thanks in advance.
Rod

Not sure if it was exactly the same problem. The syptem we see in common is that you can no longer ssh to the server. (I think once the clock freezes it had trouble negotiating keys.)
This happened on the first box and we rebooted it.
When this happened on a different box, we investigated further to get the information I have supplied above.
The boxes are Identical. Quad core Intel. Core2Quad. On gigabyte motherboards GA-EP45-DS4p with 16gb OCZ ram. Multipath with qla2340 fibre card to SAN.
They are in the same server pool.
Thanks

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