Server rebooting no kernel panic halt

[npolite]

Hello,

We have a server running CentOS 5 Linux 2.6.18-128.1.16.el5xen #1 SMP Tue Jun 30 06:39:23 EDT 2009 x86_64 x86_64 x86_64 GNU Linux. We've seen at random times that the server will just reboot and nothing is logged in messages. I tried to enable kdump but was only able to get a 5.4 gig dump since our /var directory is set to 10GB. Here is the messages I see before and after the server restart. I had thought that when a kernel panics, it is supposed to halt the system and not reboot it. My /proc/sys/kernel/panic is set to 0. I can run an update but want to have some sort of idea what is causing the issue and if the update will fix anything. I would appreciate any help that someone could provide.

Thanks,
Nick

May 13 20:05:22 hlotmt01 xinetd[3609]: EXIT: bpcd status=0 pid=1071 duration=1(sec)
May 13 20:05:22 hlotmt01 xinetd[3609]: START: bpcd pid=1072 from=10.203.1.1
May 13 20:05:23 hlotmt01 xinetd[3609]: EXIT: bpcd status=0 pid=1072 duration=1(sec)
May 13 20:21:26 hlotmt01 syslogd 1.4.1: restart.
May 13 20:21:26 hlotmt01 kernel: klogd 1.4.1, log source = /proc/kmsg started.
May 13 20:21:26 hlotmt01 kernel: Linux version 2.6.18-128.1.16.el5 () (gcc version 4.1.2 20080704
(Red Hat 4.1.2-44)) #1 SMP Tue Jun 30 06:07:26 EDT 2009

[Rubberman]

Have you tried a newer or different version of the kernel to see if the behavior stays the same? The current CentOS 5 kernel is 2.6.18-164. Also, are you running virtual machines at the time of the reboot? I see that you are using the xen-enabled kernel.

[previso]

Overheating will cause system reboot. I've had to upgrade the fans twice, the case fan and the vidcard fan. Check BIOS on unscheduled reboot and look at temperatures.