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[Xen-users] Xen system hang or freeze

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Xen system hang or freeze
From: Paraic Gallagher <paraic.gallagher@xxxxxxxxx>
Date: Fri, 3 Apr 2009 15:56:28 +0100
Delivery-date: Fri, 03 Apr 2009 07:57:12 -0700
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Hi all,

This is my first post to the list, I hope someone out there can help!

I am running xen 3.0.3, with CentOS 5.2 based Dom0 (kernel-xen-2.6.18-92.1.22.el5)

Recently I have noticed some complete system lockups on a few different servers. Neither Dom0 or any of the guests respond to pings, connecting a keyboard and monitor to the system only shows a blank screen. Nothing is written to logs at time of lockup.

The problem is very difficult to reproduce and seems very random by nature. Sometimes if a system is left running for a few weeks it will happen, other times it can happen after a reboot. I have tried taxing the system running various scripts, rebooting numerous times, and creating/destroying a few guests, etc but no luck. It seems like a hardware issue but has been reproduced on a few different machines.

For a while (clutching at straws) I thought it was due to changes in the clock (from daylight savings) so tried changing time backwards and forwards but this had no effect.

Has anyone else out there seen a problem like this? Is there any way to diagnose it when it does happen. (It is very frustrating to have a hanged system where you cannot access for any information).

If anyone wants any further info or ideas on what I could try please let me know.

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