[CentOS] Random server reboot after update to CentOS 5.3

[JohnS]

On Wed, 2009-05-27 at 18:03 -0500, Dave Jones wrote:

> 
> I am experiencing the same issue with random reboots after a 5.3
> upgrade.  Sometimes it will go for days without rebooting then today
> it has rebooted 6 times at random times.  I have modified grub.conf to
> go back to 2.6.18-92.1.22.el5xen on my dom0 and my only domU so we
> will see what happens (or hopefully doesn't happen) the next few days.
> 
> I have a 3.0 P4 CPU with HT that does not support 64-bit so it's
> running an i686 kernel. 
---
 A P4 with HT...? This may not be your problem but I have several P4
CPUs with HT Enabled. Do you get messages in /var/log/messages/ about
your cpu temp is above thresh hold and that will throttle back cpu 0 or
1 constanlty? Also just currious are you using "p4-clockmod" driver? On
a reboot that had happened those were the messages I had in my logs. 

JohnStanley