Random server reboot after update to CentOS 5.3

[Peter Hopfgartner]

Dear ML

We upgraded a Dell Poweredge PE 1950 Server the 8th of May. Since then
the server rebooted 3 times without external cause (it is located in a
server farm with redundant power supply etc.). Looking at the servers
monitoring infrastructure with Dell's own OpenManage tools, I  get
strange errors:

[root at servernew ~]# omreport system esmlog

(....)

Severity      : Critical
Date and Time : Mon May 11 17:46:59 2009
Description   : System Software event: run-time critical stop was asserted

Severity      : Critical
Date and Time : Fri May 15 21:07:57 2009
Description   : System Software event: run-time critical stop was asserted

Severity      : Critical
Date and Time : Wed May 20 21:00:53 2009
Description   : System Software event: run-time critical stop was asserted


(...)

This class of errors never happened before in over a year that the
server is running.

There is no mention of any anomaly, except the boot messages itself, in
/var/log/messages.

The server runs the 64 bit flavor of CentOS hosting some XEN virtual
machines and some PostgreSQL and MySQL databases. It run without any
issues with CentOS 5.1 and 5.2.

I interpreted these issues as some kernel/software related problem, but
do not know how to make a more accurate diagnosis of the problem.

Can anybody give me some hint? Has anybody had some similar issue?

Regards,

Peter

P.S.: Some further info:

exact software stack CentOS: updated 5.3 + PostgreSQL from CentOS 
Testing and some homebuild GIS package

uname -a: Linux servernew 2.6.18-128.1.10.el5xen #1 SMP Thu May 7 
11:07:18 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

[root at servernew ~]# omreport about

Product name : Server Administrator Install Core (subscription)
Version      : 5.5.0
Copyright    : Copyright (C) Dell Inc. 1995-2008. All rights reserved.
Company      : Dell Inc.


-- 

Dott. Peter Hopfgartner

R3 GIS Srl - GmbH
Via Johann Kravogl-Str. 2
I-39012 Meran/Merano (BZ)
Email: peter.hopfgartner at r3-gis.com
Tel. : +39 0473 494949
Fax  : +39 0473 069902
www  : http://www.r3-gis.com