Created attachment 716006 [details]
blivet log

I have MD RAID array directly on a disk, without partition table:
$ mdadm -C -l 0 -n 3 /dev/md0  /dev/sda /dev/sdb{5,6}

Blivet throws an exception on blivet.reset()
  File "tools/blivet_init.py", line 27, in <module>
    b.reset()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 401, in reset
    self.devicetree.populate(cleanupOnly=cleanupOnly)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1787, in populate
    self._populate()
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 1885, in _populate
    self.addUdevDevice(dev)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 990, in addUdevDevice
    device = self.addUdevMDDevice(info)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 698, in addUdevMDDevice
    "devicetree as %s" % (name, device.name))
blivet.errors.DeviceTreeError: MD RAID device None already in devicetree as 0

Version-Release number of selected component (if applicable):
python-blivet-0.8-1.fc20.noarch