Pkg xen devel - Oct 2011 - Bug#644100: pygrub error if the root disk value is not the first in the list.

Package: xen-utils-4.0
Version: 4.0.1-2
Severity: normal
File: pygrub

pygrub error when trying to run a image created by xen-create-image
with partitions option.

----------------------------------------------------------------------------------------------------------------------------------------
[2011-10-02 21:36:08 1512] DEBUG (XendDomainInfo:101)
XendDomainInfo.create(['vm', ['name', 'builder'],
['memory', '512'],
['on_poweroff', 'destroy'], ['on_reboot',
'restart'], ['on_crash',
'restart'], ['on_xen
d_start', 'ignore'], ['on_xend_stop', 'ignore'],
['vcpus', '1'],
['oos', 1], ['bootloader',
'/usr/lib/xen-default/bin/pygrub'],
['bootloader_args', ''], ['image', ['linux',
['root', '/dev/xvda2
ro'], ['videoram
', 4], ['tsc_mode', 0], ['nomigrate', 0]]],
['s3_integrity', 1],
['device', ['vbd', ['uname',
'phy:/dev/data/builder-var'], ['dev',
'xvda5'], ['mode', 'w']]], ['device',
['vbd', ['uname',
'phy:/dev/data/builder
-usr'], ['dev', 'xvda4'], ['mode', 'w']]],
['device', ['vbd',
['uname', 'phy:/dev/data/builder-tmp'], ['dev',
'xvda3'], ['mode',
'w']]], ['device', ['vbd', ['uname',
'phy:/dev/data/builder-root'],
['dev', 'xvda
2'], ['mode', 'w']]], ['device', ['vbd',
['uname',
'phy:/dev/data/builder-swap'], ['dev', 'xvda1'],
['mode', 'w']]],
['device', ['vif', ['ip', '192.168.0.40'],
['mac',
'00:16:3E:E0:4F:D4'], ['bridge', 'eth0']]]
])
[2011-10-02 21:36:08 1512] DEBUG (XendDomainInfo:2508)
XendDomainInfo.constructDomain
[2011-10-02 21:36:08 1512] DEBUG (balloon:220) Balloon: 995444 KiB
free; need 16384; done.
[2011-10-02 21:36:08 1512] DEBUG (XendDomain:464) Adding Domain: 3
[2011-10-02 21:36:08 1512] DEBUG (XendDomainInfo:2818)
XendDomainInfo.initDomain: 3 256
[2011-10-02 21:36:08 14338] DEBUG (XendBootloader:113) Launching
bootloader as ['/usr/lib/xen-default/bin/pygrub',
'--args=root=/dev/xvda2 ro ',
'--output=/var/run/xend/boot/xenbl.24899', '/dev/data/builder-var
'].
[2011-10-02 21:36:08 1512] ERROR (XendBootloader:214) Boot loader
didn't return any data!
[2011-10-02 21:36:08 1512] ERROR (XendDomainInfo:483) VM start failed
Traceback (most recent call last):
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
469, in start
    XendTask.log_progress(31, 60, self._initDomain)
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendTask.py", line 209,
in log_progress
    retval = func(*args, **kwds)
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
2820, in _initDomain
    self._configureBootloader()
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
3266, in _configureBootloader
    bootloader_args, kernel, ramdisk, args)
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendBootloader.py", line
215, in bootloader
    raise VmError, msg
VmError: Boot loader didn't return any data!
[2011-10-02 21:36:08 1512] DEBUG (XendDomainInfo:3053)
XendDomainInfo.destroy: domid=3
[2011-10-02 21:36:08 1512] DEBUG (XendDomainInfo:2416) No device model
[2011-10-02 21:36:08 1512] DEBUG (XendDomainInfo:2418) Releasing devices
[2011-10-02 21:36:08 1512] ERROR (XendDomainInfo:106) Domain construction failed
Traceback (most recent call last):
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
104, in create
    vm.start()
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
469, in start
    XendTask.log_progress(31, 60, self._initDomain)
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendTask.py", line 209,
in log_progress
    retval = func(*args, **kwds)
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
2820, in _initDomain
    self._configureBootloader()
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendDomainInfo.py", line
3266, in _configureBootloader
    bootloader_args, kernel, ramdisk, args)
  File "/usr/lib/xen-4.0/lib/python/xen/xend/XendBootloader.py", line
215, in bootloader
    raise VmError, msg
VmError: Boot loader didn't return any data!
-------------------------------------------------------------------------------------------------------------------------------------------------
[snip]
root        = '/dev/xvda2 ro'
disk        = [
                  'phy:/dev/data/builder-var,xvda5,w',
                  'phy:/dev/data/builder-usr,xvda4,w',
                  'phy:/dev/data/builder-tmp,xvda3,w',
                  'phy:/dev/data/builder-root,xvda2,w',
                  'phy:/dev/data/builder-swap,xvda1,w',
              ]
[snip]
------------------------------------------------------------------------------------------------------------------------------------------------

I noticed the bootloader was trying to use builder-var partition
instead of right one builder-root. I placed the root line first and
just worked.

I really don't know if this is a bug in pygrub or xend but I hope this
report helps anyway.

Thanks in advance.