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[Nikola Đipanov <ndipanov@xxxxxxxxxx>]

Public bug reported:

_default_block_device_names method of the compute manager, would call
the conductor block_device_mapping_update method with the wrong
arguments, causing a TypeError and ultimately the instance to fail.

This bug happens only when using a driver that does not provid it's own
implementation of default_device_names_for_instance, (currently only the
libvirt driver does this).

Also affects havana since https://review.openstack.org/#/c/40229/

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: havana-backport-potential

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https://bugs.launchpad.net/bugs/1260806

Title:
  Defaulting device names fails to update the database

Status in OpenStack Compute (Nova):
  New

Bug description:
  _default_block_device_names method of the compute manager, would call
  the conductor block_device_mapping_update method with the wrong
  arguments, causing a TypeError and ultimately the instance to fail.

  This bug happens only when using a driver that does not provid it's
  own implementation of default_device_names_for_instance, (currently
  only the libvirt driver does this).

  Also affects havana since https://review.openstack.org/#/c/40229/

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