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[Elod Illes <1868033@xxxxxxxxxxxxxxxxxx>]

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

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

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

** Changed in: nova/train
       Status: New => Fix Released

** Changed in: nova/ussuri
       Status: New => Fix Committed

** Changed in: nova/stein
       Status: New => Fix Committed

** Changed in: nova/stein
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1868033

Title:
  Booting instance with pci_device fails during rocky->stein live
  upgrade

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) stein series:
  Fix Released
Status in OpenStack Compute (nova) train series:
  Fix Released
Status in OpenStack Compute (nova) ussuri series:
  Fix Committed

Bug description:
  Environment:

  Stein nova-conductor having set upgrade_levels to rocky 
  Rocky nova-compute

  Boot an instance with a flavour that has a pci_device

  Error:

  Failed to publish message to topic 'nova': maximum recursion depth
  exceeded: RuntimeError: maximum recursion depth exceeded

  
  Tracked this down it it continually trying to backport the InstancePCIRequests:

  It gets as arguments:
  objinst={u'nova_object.version': u'1.1', u'nova_object.name': u'InstancePCIRequests', u'nova_object.data': {u'instance_uuid': u'08212b12-8fa8-42d9-8d3e-52ed60a64135', u'requests': [{u'nova_object.version': u'1.3', u'nova_object.name': u'InstancePCIRequest', u'nova_object.data': {u'count': 1, u'is_new': False, u'numa_policy': None, u'request_id': None, u'requester_id': None, u'alias_name': u'V100-32G', u'spec': [{u'vendor_id': u'10de', u'product_id': u'1db6'}]}, u'nova_object.namespace': u'nova'}]}, u'nova_object.namespace': u'nova'}, 

  object_versions={u'InstancePCIRequests': '1.1', 'InstancePCIRequest':
  '1.2'}

  
  It fails because it doesn't backport the individual InstancePCIRequest inside the InstancePCIRequests object and so keeps trying.

  Error it shows is: IncompatibleObjectVersion: Version 1.3 of
  InstancePCIRequest is not supported, supported version is 1.2


  I have fixed this in our setup by altering obj_make_compatible to
  downgrade the individual requests to version 1.2 which seems to work
  and all is good

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