Xen users - Mar 2011 - “domain crashed” when creating new Xen instance (Unhandled invalid opcode fault/trap [#6] in domain)

I have downloaded a Xen virtual machine image from the appscale project, 
and I am trying to start it up. However once I run the command;

     xm create -c -f xen.conf

The instance immediately crashes and provides no console output. however 
it produces logs that I have posted below. but this is the error;

     [2011-03-01 12:34:03 xend.XendDomainInfo 3580] WARNING 
(XendDomainInfo:1178) Domain has crashed: name=appscale-1.4b id=10.

In the output from "xm dmesg" it has this;
(XEN) sysctl.c:51: Allowing physinfo call with newer ABI version
(XEN) mm.c:1471:d2 Bad L1 flags 800000
(XEN) traps.c:405:d2 Unhandled invalid opcode fault/trap [#6] in domain 
2 on VCPU 0 [ec=0000]
(XEN) domain_crash_sync called from entry.S
(XEN) Domain 2 (vcpu#0) crashed on cpu#3:
(XEN) ----[ Xen-3.1.2-194.32.1.el5  x86_64  debug=n  Not tainted ]----
(XEN) CPU:    3
(XEN) RIP:    e033:[<ffffffff8020b612>]

here is the full output http://fpaste.org/w1Bm/

I have managed to mount the root.img file locally and verify that it is 
actually an ext3 file system.

I am running Xen 3.0.3 that is a stock RPM from the CentOS 5 repos;

     # rpm -qa | grep -i xen xen-libs-3.0.3-105.el5_5.5
     xen-3.0.3-105.el5_5.5
     xen-libs-3.0.3-105.el5_5.5
     kernel-xen-2.6.18-194.32.1.el5


any suggestions on how to proceed with troubleshooting? (i am a newbie 
to Xen)

so far I have enabled console logging, but the log file is empty.

All the output into the log files is included here;
http://fpaste.org/va2s/


my startup configuration is like this;
# cat xen.conf

# Configuration file for the Xen instance AppScale, created
# bn VMBuilder
kernel = ''/boot/vmlinuz-2.6.27-7-server''
ramdisk = ''/boot/initrd.img-2.6.27-7-server''
memory = 1024
vcpus = 1

#gateway   = 192.168.2.1
#netmask   = 255.255.255.0
#broadcast = 192.168.2.255

root = ''/dev/sda1 ro''
disk = [
''file:/local/xen/domains/appscale1.4/root.img,sda1,w'',
]

name = ''appscale-1.4b''

dhcp    = ''dhcp''
vif         = [ ''mac=00:16:3B:72:10:E4'' ]

on_poweroff = ''destroy''
on_reboot   = ''restart''
on_crash    = ''restart''

extra = ''xencons=tty console=tty1 console=hvc0 debugger=y debug=y 
sync_console''







any suggestions on what the problem is?

Thanks,
Tom








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