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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Looks like the regression was introduced in Ocata:
https://review.opendev.org/#/c/319379/

** Changed in: nova
       Status: New => Triaged

** Changed in: nova
   Importance: Undecided => Low

** Also affects: nova/train
   Importance: Undecided
       Status: New

** Also affects: nova/stein
   Importance: Undecided
       Status: New

** Also affects: nova/ocata
   Importance: Undecided
       Status: New

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

** Also affects: nova/queens
   Importance: Undecided
       Status: New

** Also affects: nova/pike
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1857306

Title:
  _bury_in_cell0 could not handle instance duplicate exception

Status in OpenStack Compute (nova):
  Triaged
Status in OpenStack Compute (nova) ocata series:
  New
Status in OpenStack Compute (nova) pike series:
  New
Status in OpenStack Compute (nova) queens series:
  New
Status in OpenStack Compute (nova) rocky series:
  New
Status in OpenStack Compute (nova) stein series:
  New
Status in OpenStack Compute (nova) train series:
  New

Bug description:
  For stable/stein

  if there were NoValidHost from scheduler, conductor should create
  Instance object in cell0. But I found if there is additional
  exception(InstanceExist) in the function, conductor could not catch
  the exception which result in instance state stuck in 'scheduling'.

  
  How to reproduce

  1. osapi_compute_unique_server_name_scope = True
  2. Cellv2
  3. Create instance with hostname which previously built and without any valid host.

  Result

  1. Conductor does not make instance DB creation in cell0 from
  _bury_in_cell0

  What to expect

  1. nova_cell0 create instance in cell0 with error state.

  Thanks

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