Hi,
I have installed some 4.2.2 ovirt nodes (fresh installation) and upgraded them to 4.2.3 from the ovirt-engine UI.
All was right, but if I want to upgrade from 4.2.3 to any new version I got a failure in post script.
In the /tmp/imgbased.log I have the following error:

2018-09-17 14:28:09,073 [DEBUG] (MainThread) Calling: (['rmdir', u'/tmp/mnt.POEYF'],) {'close_fds': True, 'stderr': -2}
2018-09-17 14:28:09,080 [DEBUG] (MainThread) Returned:
2018-09-17 14:28:09,081 [ERROR] (MainThread) Failed to migrate etc
Traceback (most recent call last):
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/plugins/osupdater.py", line 118, in on_new_layer
    check_nist_layout(imgbase, new_lv)
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/plugins/osupdater.py", line 209, in check_nist_layout
    v.create(t, paths[t]["size"], paths[t]["attach"])
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/volume.py", line 48, in create
    "Path is already a volume: %s" % where
AssertionError: Path is already a volume: /var/crash
2018-09-17 14:28:09,092 [DEBUG] (MainThread) Calling binary: (['umount', '-l', u'/tmp/mnt.gt3IE'],) {}
2018-09-17 14:28:09,092 [DEBUG] (MainThread) Calling: (['umount', '-l', u'/tmp/mnt.gt3IE'],) {'close_fds': True, 'stderr': -2}
2018-09-17 14:28:09,181 [DEBUG] (MainThread) Returned:
2018-09-17 14:28:09,182 [DEBUG] (MainThread) Calling binary: (['rmdir', u'/tmp/mnt.gt3IE'],) {}
2018-09-17 14:28:09,182 [DEBUG] (MainThread) Calling: (['rmdir', u'/tmp/mnt.gt3IE'],) {'close_fds': True, 'stderr': -2}
2018-09-17 14:28:09,190 [DEBUG] (MainThread) Returned:
2018-09-17 14:28:09,190 [DEBUG] (MainThread) Calling binary: (['umount', '-l', u'/tmp/mnt.2weYe'],) {}
2018-09-17 14:28:09,190 [DEBUG] (MainThread) Calling: (['umount', '-l', u'/tmp/mnt.2weYe'],) {'close_fds': True, 'stderr': -2}
2018-09-17 14:28:09,389 [DEBUG] (MainThread) Returned:
2018-09-17 14:28:09,389 [DEBUG] (MainThread) Calling binary: (['rmdir', u'/tmp/mnt.2weYe'],) {}
2018-09-17 14:28:09,389 [DEBUG] (MainThread) Calling: (['rmdir', u'/tmp/mnt.2weYe'],) {'close_fds': True, 'stderr': -2}
2018-09-17 14:28:09,397 [DEBUG] (MainThread) Returned:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib64/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/__main__.py", line 53, in <module>
    CliApplication()
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/__init__.py", line 82, in CliApplication
    app.hooks.emit("post-arg-parse", args)
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/hooks.py", line 120, in emit
    cb(self.context, *args)
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/plugins/update.py", line 56, in post_argparse
    base_lv, _ = LiveimgExtractor(app.imgbase).extract(args.FILENAME)
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/plugins/update.py", line 118, in extract
    "%s" % size, nvr)
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/plugins/update.py", line 99, in add_base_with_tree
    new_layer_lv = self.imgbase.add_layer(new_base)
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/imgbase.py", line 192, in add_layer
    self.hooks.emit("new-layer-added", prev_lv, new_lv)
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/hooks.py", line 120, in emit
    cb(self.context, *args)
  File "/tmp/tmp.s2GHHNumuT/usr/lib/python2.7/site-packages/imgbased/plugins/osupdater.py", line 132, in on_new_layer
    raise ConfigMigrationError()
imgbased.plugins.osupdater.ConfigMigrationError

I have this on all nodes.
Today I tried to make a fresh 2.2 install on a test VM, execute "yum update", updated it to 2.3 and then I got tha same error again.
I did a default installation from ovirt-node-ng-installer-ovirt-4.2-2018040514.iso, automatic partitioning and nothing customized.
Is there anyone having the same issue or knowing how to solve it?
Thanks in advantage.
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