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Re: [Xen-users] hvm boot causing dom0 to crash

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] hvm boot causing dom0 to crash
From: Mark Chaney <macscr@xxxxxxxxxx>
Date: Tue, 20 Jul 2010 09:32:34 -0500
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Nothing had changed on the dom0 that I know of. Other guests on running on that dom0 fine and its stable. Nothing happens until I try starting that hvm. As far as the HVM, I had run aptitude update/upgrade on it, but it the day before, but I had done that with the other debian hvm on the other dom0 and its not having issues. =/

- Mark

On 07/20/2010 07:30 AM, Pasi Kärkkäinen wrote:
On Tue, Jul 20, 2010 at 03:27:47AM -0500, Mark Chaney wrote:
I am running Xen 3.4.3 on CentOS 5.5 x86_64, with kernel 2.6.18-194.8.1.el5xen. 
My fully virtualized guest (HVM) is running Debian 5 with kernel 2.6.33 x86_64. 
The debian guest had been running for over 10 days with no issues until i 
rebooted it. Now every time i try to start up the guest, the entire dom0 
crashes and reboots. Whats odd is that I have a very similar debian guest (used 
the same appliance iso) running on another dom0 that is not having these same 
issues. They are at two different locations, so I cant easily test the 
troublesome guest on a different dom0 and vice versa. This last time i tried to 
start the guest it seemed to go almost through the boot processes, but then 
suddenly rebooted the guest and it got all the way to the starting firewall 
part before it crashed the dom0.

Below if the guests cfg if it helps:

name = "mailcleaner_ent_mx2"
maxmem = 4096
memory = 1024
vcpus = 2
builder = "hvm"
kernel = "/usr/lib/xen/boot/hvmloader"
boot = "c"
pae = 1
acpi = 1
apic = 1
localtime = 0
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
device_model = "/usr/lib64/xen/bin/qemu-dm"
vfb = [ "type=vnc,vncunused=1,keymap=en-us" ]
disk = [ "phy:/dev/VolGroup00/mailcleaner_ent_mx2,hda,w", ",hdc:cdrom,r" ]
vif = [ "mac=00:16:36:47:cc:e3,bridge=eth0,script=vif-bridge,vifname=vif-1.0" ]
parallel = "none"
serial = "pty"


Any ideas on what I should be looking for? I really need to get this guest back 
up ASAP as its the secondary mx mail server that im testing and it has some 
email on it already that I need to deliver to my test accounts.

Did you change something in the guest when it started crashing? Or something in 
the dom0?
Are you sure your hardware is OK ?

A guest should never crash host/hypervisor/dom0..

-- Pasi



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