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Re: [Xen-users] Xen system hang or freeze

To: Martin Fernau <m.fernau@xxxxxxxxxx>
Subject: Re: [Xen-users] Xen system hang or freeze
From: Andrew Lyon <andrew.lyon@xxxxxxxxx>
Date: Sun, 5 Apr 2009 13:29:20 +0100
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On Sat, Apr 4, 2009 at 4:00 PM, Martin Fernau <m.fernau@xxxxxxxxxx> wrote:
> Hi,
> I just want to tell you that I've the same issue for one server!
> Hardware:
> Fujitsu Siemens PRIMERGY TX200 S4
> CPU: Intel Xeon Dual Quad E5405 2GhZ
> Hardware Raid: LSI Logic / Symbios Logic MegaRAID SAS 1078 with SAS HDDs
> I'm running 4 guests on it:
>  - Win2003
>  - Win2003
>  - Gentoo Linux
>  - Windows XP Prof
> The xen 3.3.0 is running on a gentoo with a 2.6.18-xen-r12 kernel.

I had the same problem with the 2.6.18-xen-rX Gentoo kernels, so I
made my own ebuild and patches from the openSUSE Xen patches, you can
get it from http://code.google.com/p/gentoo-xen-kernel/downloads/list


> The systems hangs round about all 3-4 weeks as far as I can tell. This server
> is quite new (from nov 2008) and the ServerView doesn't tell me anything about
> hardware problems. It seems from this point that the hardware is ok.
> If the server hangs then it's not responsive for any kind of input. Neither
> the network is working (ping to dom0 or one of the guests) nor
> keyboard/monitor of the server itself is responding to anything. Black
> screen.. nothing more. A hard reset is the only thing to get the system back
> to life.
> /var/log/messages just show nothing. It's like disconnecting the power cable.
> I have no idea and no hints about this problem.
> At the moment I've a cronjob running which collects some system informations
> of the dom0 every minute - I hope that the very last run (just before the next
> crash happens) will show me some kind of informations which maybe point me to
> the problem!? However - I currently have no clue which kind of informations
> will be helpful for this purpose. I currently log the following things every
> minute:
>  - dmesg
>  - free
>  - netstat -lnp
>  - ps aux
>  - w
>  - vgdisplay
>  - lvdisplay
> hints about other informations which could be helpful? any xen related
> commands?
> Interesting that you use lvm too. I also use lvm for my guests and use the
> snapshot functionality on a daily basis to backup the server to a tape. dom0
> is running on a normal partition. I use lvm 2.02.36
> Regards,
> Martin
> Am Freitag, 3. April 2009 16:56:28 schrieb Paraic Gallagher:
>> 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.
>> Regards,
>> Paraic.
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