[Xen-users] System unusable (hangs) after xm create - xen 4

[LDavis <ldavis@xxxxxxxxxxxxxx>]

Hello

I have a production server, on which I had to install a new OS.  
Unfortunately, xen is not willing to run any domUs!
Any help would be most highly appreciated.

My problem is essentially that described in this post, to which there was 
no answer at the time:
<http://lists.xensource.com/archives/html/xen-devel/2009-06/msg01147.html>

Symptoms:
When trying to xm create a previously functional (Xen 3.3 and 3.0) domU 
(with appropriate kernel), the system appears to lock up solid.
In fact, it still logs some things for a while.

Sometimes I can control-c out of the xm process, but the next command will 
lock it up just as hard.
Sometimes a ctrl-alt-del at the console is reported to the ssh session 
from which I work, but in no case does a reboot actually happen, and a 
hard reset is necessary to recover.

Environment:

Ubuntu 10.04 server
Kernel: 2.6.32.12-xen-2-gba739f9 (custom compile with huge initramfs)
Xen 4.0

This setup was developed based on instructions from here:
<http://bderzhavets.wordpress.com/2010/04/24/set-up-ubuntu-10-04-server-pv-domu-at-xen-4-0-dom0-pvops-2-6-32-10-kernel-dom0-on-top-of-ubuntu-10-04-server/>

Grub config block:

title           Xen 4.0 / Ubuntu 10.04 LTS, kernel 
2.6.32.12-xen-2-gba739f9
root            (hd0,5)
kernel /xen-4.0.0.gz
module /vmlinuz-2.6.32.12-xen-2-gba739f9 root=/dev/mapper/main-root ro
module /initrd.img-2.6.32.12-xen-2-gba739f9

domU config:

name = "[DOMUNAME]"
kernel = "/etc/xen/boot/vmlinuz-2.6.24-23-xen"
ramdisk = "/etc/xen/boot/initrd.img-2.6.24-23-xen"
root = "/dev/sda1 ro"
memory = 200
disk = [ "phy:/dev/mapper/virtuals-[DOMUNAME],sda1,w" ]
hostname="[DOMUNAME].[FQDN]"
vnc=0
nographic=1
serial='pty'
monitor=0

I have placed a full dom0 dmesg, lshw (--disable dmi), and xend.log here:
http://tinyurl.com/266osb3//dmesg.txt
http://tinyurl.com/266osb3//xend.log.txt
http://tinyurl.com/266osb3//lshw.html

The probably relevant portion of xend.log is:

[2010-05-14 13:10:57 1196] INFO (SrvDaemon:336) Xend changeset: 
unavailable.
[.]
[2010-05-14 13:10:58 1196] DEBUG (XendDomain:398) number of vcpus to use 
is 0
[2010-05-14 13:10:58 1196] DEBUG (XendDomainInfo:1891) 
XendDomainInfo.handleShutdownWatch
[2010-05-14 13:10:58 1196] WARNING (XendAPI:705) API call: VBD.set_device 
not found
[2010-05-14 13:10:58 1196] WARNING (XendAPI:705) API call: VBD.set_type 
not found
[2010-05-14 13:10:58 1196] WARNING (XendAPI:705) API call: 
session.get_all_records not found
[2010-05-14 13:10:58 1196] WARNING (XendAPI:705) API call: 
event.get_record not
found
[2010-05-14 13:10:58 1196] WARNING (XendAPI:705) API call: event.get_all 
not found
[2010-05-14 13:10:58 1196] WARNING (XendAPI:705) API call: VIF.set_device 
not found
[2010-05-14 13:10:58 1196] WARNING (XendAPI:705) API call: VIF.set_MAC not 
found[2010-05-14 13:10:58 1196] WARNING (XendAPI:705) API call: 
VIF.set_MTU not found[2010-05-14 13:10:58 1196] WARNING (XendAPI:705) API 
call: debug.get_all not found
[2010-05-14 13:10:58 1196] INFO (XMLRPCServer:156) Opening Unix domain 
socket XML-RPC server on /var/run/xend/xen-api.sock; authentication has 
been disabled for this server.
[2010-05-14 13:10:58 1196] INFO (XMLRPCServer:156) Opening Unix domain 
socket XML-RPC server on /var/run/xend/xmlrpc.sock.

Thanks

LDavis

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