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[Brian Elliott <bdelliott@xxxxxxxxx>]

Public bug reported:

Commit 0c22f71fb338b1aa7c4a2b30555449a464ad3874 introduced a filter that
allowed the cells scheduler to route instance builds to cells with a
matching 'prominent' hypervisor version.
(nova.cells.filters.image_properties.ImagePropertiesFilter).

This filter has a bug where the set of cell capabilities is mutated via
set pop().  This causes a race where the filter can fail if it runs
again before the capabilities list gets repopulated from the child cell.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1325705

Title:
  Cells - prominent hypervisor version filter bug

Status in OpenStack Compute (Nova):
  New

Bug description:
  Commit 0c22f71fb338b1aa7c4a2b30555449a464ad3874 introduced a filter
  that allowed the cells scheduler to route instance builds to cells
  with a matching 'prominent' hypervisor version.
  (nova.cells.filters.image_properties.ImagePropertiesFilter).

  This filter has a bug where the set of cell capabilities is mutated
  via set pop().  This causes a race where the filter can fail if it
  runs again before the capabilities list gets repopulated from the
  child cell.

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