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[Adam Gandelman <1438920@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Tempest recently made some changes around specifying fixed network to
instances during spawn.  When this happens during an icehouse->juno
partial upgrade, we fail to spawn instances and they are stuck in
scheduling.

Conductor logs show:

oslo.messaging.rpc.dispatcher [req-047d24c2-6477-4838-afde-cc3c7371b19e
VolumesV2ActionsTest-21337662 VolumesV2ActionsTest-1578486140] Exception
during message handling: need more than 2 values to unpack

It looks like there is code in Nova to handle this case during an icehouse partial upgrade, but only takes into account doing so with Neutron:
https://git.openstack.org/cgit/openstack/nova/tree/nova/compute/rpcapi.py#n982  This needs some special casing to handle NetworkRequestList objects for nova-network, as well.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1438920

Title:
  specification of a nova network to instance during icehouse->juno
  partial upgrade fails

Status in OpenStack Compute (Nova):
  New

Bug description:
  Tempest recently made some changes around specifying fixed network to
  instances during spawn.  When this happens during an icehouse->juno
  partial upgrade, we fail to spawn instances and they are stuck in
  scheduling.

  Conductor logs show:

  oslo.messaging.rpc.dispatcher [req-047d24c2-6477-4838-afde-
  cc3c7371b19e VolumesV2ActionsTest-21337662
  VolumesV2ActionsTest-1578486140] Exception during message handling:
  need more than 2 values to unpack

  It looks like there is code in Nova to handle this case during an icehouse partial upgrade, but only takes into account doing so with Neutron:
  https://git.openstack.org/cgit/openstack/nova/tree/nova/compute/rpcapi.py#n982  This needs some special casing to handle NetworkRequestList objects for nova-network, as well.

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