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RE: [Xen-users] How do I find out why Dom0 crashes on guest startup?

To: "Schober Walter" <Walter.Schober@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] How do I find out why Dom0 crashes on guest startup?
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Date: Fri, 18 May 2007 12:12:15 +0200
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Thread-topic: [Xen-users] How do I find out why Dom0 crashes on guest startup?

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Schober Walter
> Sent: 18 May 2007 11:08
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] How do I find out why Dom0 crashes on 
> guest startup?
> Before Wednesday all run fine. Then I must have done 
> something - I tried to get rid of those IPMI error messages 
> on starting hpasm, installed the latest RPMs from HP website 
> - but can't tell exactly when it started that the DomU 
> startup crashed my Dom0.
> Anyway ... How can I find out now, what exactly causes my Dom0 
> to crash? Which logs would tell me that? 
> /var/log/messages: Sometimes xenbr changes into forwarding of 
> tap0 before, sometimes not. 
> /var/log/xen/xend.log: The only thing that sounds strange: 
> [2007-05-18 11:56:58 xend 3475] DEBUG (XendDomain:153) number 
> of vcpus to use is 0 
> Meanwhile: hp-OpenIMPI, hpasm, hprsm, cmanic removed, 
> OpenIPMI removed. 
> Still, the Dom0 crashed (just reboots, no output on Display, 
> SSH connection interrupted) on starting a DomU. 

Are you able to get serial output from the server to another machine? 

If so, set xen to use "console=com1 com1=115200,8n1".

If not, try adding "noreboot". 

[Both of these are arguments on the "xen.gz" line in your

> System: Centos 5 x86_64 @ HP DL360G5, latest yum update done. 
> Will attach more info on config, when needed. 
> Many thanks! 
> Walter 

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