Description of problem:
While trying to install latest ppc64 server dvd iso (e.g from nightly Fedora-Rawhide-20161108.n.1 ) using anaconda installer GUI, error message box appears as soon as anaconda GUI appears.

Additional information:
Checked with latest ppc64le and s390x rawhide nightly composes too. Seems to be a common problem.


Version-Release number of selected component:
anaconda-26.10-1

The following was filed automatically by anaconda:
anaconda 26.10-1 exception report
Traceback (most recent call first):
  File "/usr/lib64/python3.5/site-packages/gi/overrides/BlockDev.py", line 433, in wrapped
    raise self._xrules[e_type].new_exc(msg)
  File "/usr/lib/python3.5/site-packages/blivet/devices/dm.py", line 113, in status
    return blockdev.dm.map_exists(self.map_name, True, True)
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/devices/storage.py", line 146, in __init__
    if self.status:
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/devices/dm.py", line 84, in __init__
    parents=parents, sysfs_path=sysfs_path)
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/devices/dm.py", line 253, in __init__
    exists=exists, target="crypt")
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/devices/luks.py", line 62, in __init__
    uuid=None, exists=exists)
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/populator/helpers/luks.py", line 103, in run
    exists=True)
  File "/usr/lib/python3.5/site-packages/blivet/populator/populator.py", line 345, in handle_format
    helper_class(self, info, device).run()
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/populator/populator.py", line 318, in handle_device
    self.handle_format(info, device)
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/populator/populator.py", line 518, in _populate
    self.handle_device(dev)
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/populator/populator.py", line 451, in populate
    self._populate()
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/blivet.py", line 271, in reset
    self.devicetree.populate(cleanup_only=cleanup_only)
  File "/usr/lib/python3.5/site-packages/blivet/threads.py", line 45, in run_with_lock
    return m(*args, **kwargs)
  File "/usr/lib/python3.5/site-packages/blivet/osinstall.py", line 1175, in storage_initialize
    storage.reset()
  File "/usr/lib64/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.5/site-packages/pyanaconda/threads.py", line 251, in run
    threading.Thread.run(self, *args, **kwargs)
gi.overrides.BlockDev.BlockDevNotImplementedError: The function 'bd_dm_map_exists' called, but not implemented!

Additional info:
addons:         com_redhat_kdump
cmdline:        /usr/bin/python3  /sbin/anaconda
cmdline_file:   BOOT_IMAGE=/ppc/ppc64/vmlinuz ro
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         4.9.0-0.rc4.git0.1.fc26.ppc64
product:        Fedora
release:        Cannot get release name.
type:           anaconda
version:        rawhide