Mine

root@wuhjuhbuh:/var/log/xen# tail -0f xend.log 
[2007-02-10 14:03:08 xend.XendDomainInfo 2749] DEBUG (__init__:1072) XendDomainInfo.create(['vm', ['name', 'test'], ['memory', 128], ['vcpus', 1], ['image', ['linux', ['kernel', '/boot/vmlinuz-2.6.17-10-generic'], ['root', '/dev/sda1 ro'], ['args', '4']]], ['device', ['vbd', ['uname', 'file:/xen/images/test.disk'], ['dev', 'sda1'], ['mode', 'w']]], ['device', ['vbd', ['uname', 'file:/xen/images/test.swap'], ['dev', 'sda2'], ['mode', 'w']]], ['device', ['vif', ['bridge', 'xenbr0']]]])
[2007-02-10 14:03:08 xend.XendDomainInfo 2749] DEBUG (__init__:1072) parseConfig: config is ['vm', ['name', 'test'], ['memory', 128], ['vcpus', 1], ['image', ['linux', ['kernel', '/boot/vmlinuz-2.6.17-10-generic'], ['root', '/dev/sda1 ro'], ['args', '4']]], ['device', ['vbd', ['uname', 'file:/xen/images/test.disk'], ['dev', 'sda1'], ['mode', 'w']]], ['device', ['vbd', ['uname', 'file:/xen/images/test.swap'], ['dev', 'sda2'], ['mode', 'w']]], ['device', ['vif', ['bridge', 'xenbr0']]]]
[2007-02-10 14:03:08 xend.XendDomainInfo 2749] DEBUG (__init__:1072) parseConfig: result is {'shadow_memory': None, 'uuid': None, 'on_crash': None, 'on_reboot': None, 'localtime': None, 'image': ['linux', ['kernel', '/boot/vmlinuz-2.6.17-10-generic'], ['root', '/dev/sda1 ro'], ['args', '4']], 'on_poweroff': None, 'bootloader_args': None, 'cpus': None, 'name': 'test', 'backend': [], 'vcpus': 1, 'cpu_weight': None, 'features': None, 'vcpu_avail': None, 'memory': 128, 'device': [('vbd', ['vbd', ['uname', 'file:/xen/images/test.disk'], ['dev', 'sda1'], ['mode', 'w']]), ('vbd', ['vbd', ['uname', 'file:/xen/images/test.swap'], ['dev', 'sda2'], ['mode', 'w']]), ('vif', ['vif', ['bridge', 'xenbr0']])], 'bootloader': None, 'cpu': None, 'maxmem': None}
[2007-02-10 14:03:08 xend.XendDomainInfo 2749] DEBUG (__init__:1072) XendDomainInfo.construct: None
[2007-02-10 14:03:08 xend.XendDomainInfo 2749] DEBUG (__init__:1072) XendDomainInfo.initDomain: 26 1.0
[2007-02-10 14:03:08 xend 2749] DEBUG (__init__:1072) Balloon: 131416 KiB free; need 131072; done.
[2007-02-10 14:03:08 xend 2749] INFO (__init__:1072) buildDomain os=linux dom=26 vcpus=1
[2007-02-10 14:03:08 xend 2749] DEBUG (__init__:1072) dom            = 26
[2007-02-10 14:03:08 xend 2749] DEBUG (__init__:1072) image          = /boot/vmlinuz-2.6.17-10-generic
[2007-02-10 14:03:08 xend 2749] DEBUG (__init__:1072) store_evtchn   = 1
[2007-02-10 14:03:08 xend 2749] DEBUG (__init__:1072) console_evtchn = 2
[2007-02-10 14:03:08 xend 2749] DEBUG (__init__:1072) cmdline        =  root=/dev/sda1 ro 4
[2007-02-10 14:03:08 xend 2749] DEBUG (__init__:1072) ramdisk        = 
[2007-02-10 14:03:08 xend 2749] DEBUG (__init__:1072) vcpus          = 1
[2007-02-10 14:03:08 xend 2749] DEBUG (__init__:1072) features       = 
[2007-02-10 14:03:08 xend.XendDomainInfo 2749] ERROR (__init__:1072) Domain construction failed
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 195, in create
    vm.initDomain()
  File "/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1363, in initDomain
    raise VmError(str(exn))
VmError: (22, 'Invalid argument')
[2007-02-10 14:03:08 xend.XendDomainInfo 2749] DEBUG (__init__:1072) XendDomainInfo.destroy: domid=26
[2007-02-10 14:03:08 xend.XendDomainInfo 2749] DEBUG (__init__:1072) XendDomainInfo.destroyDomain(26)