[Qemu-discuss] QImgError - find_allocation: Assertion `offs >= start' failed

[Ala Hino]

Hello,

A user is hitting the following error when performing `qemu-img commit`:

2018-01-03 09:48:54,168+0000 ERROR (tasks/5) [root] Job
u'e4d77997-db47-4c60-8f2c-019edebe9917' failed (jobs:217)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/jobs.py", line 154, in run
    self._run()
  File "/usr/share/vdsm/storage/sdm/api/merge.py", line 65, in _run
    self.operation.wait_for_completion()
  File "/usr/lib/python2.7/site-packages/vdsm/qemuimg.py", line 329, in
wait_for_completion
    self.poll(timeout)
  File "/usr/lib/python2.7/site-packages/vdsm/qemuimg.py", line 324, in poll
    self.error)
QImgError: cmd=['/usr/bin/taskset', '--cpu-list', '0-31', '/usr/bin/nice',
'-n', '19', '/usr/bin/ionice', '-c', '3', '/usr/bin/qemu-img', 'commit',
'-p', '-t', 'none', '-b', u'/rhev/data-center/mnt/
glusterSD/bms-gluster01-am5:_rhevm/ab27a13a-7a82-4cf4-86fd-
3a6c697ccef9/images/3122bbad-e3d3-446a-90b9-eb6da08dad2a/
7fa44a95-2988-4866-924c-329713989ad0', '-f', 'qcow2',
u'/rhev/data-center/mnt/glusterSD/bms-gluster01-am5:_
rhevm/ab27a13a-7a82-4cf4-86fd-3a6c697ccef9/images/3122bbad-
e3d3-446a-90b9-eb6da08dad2a/8ba82ba8-32ea-4501-95e8-55ef42812c89'],
ecode=-6, stdout=, stderr=qemu-img: block/file-posix.c:1774:
find_allocation: Assertion `offs >= start' failed.
, message=None

Would appreciate any explanation of the error and what potentially could
cause it.

Thanks,
Ala