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[Elod Illes <2040264@xxxxxxxxxxxxxxxxxx>]

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

** Also affects: nova/2024.1
   Importance: Undecided
       Status: Fix Committed

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

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

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

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https://bugs.launchpad.net/bugs/2040264

Title:
  VM rebuild fails after Zed->2023.1 upgrade

Status in OpenStack Compute (nova):
  Fix Committed
Status in OpenStack Compute (nova) 2024.1 series:
  Fix Committed
Status in OpenStack Compute (nova) antelope series:
  New
Status in OpenStack Compute (nova) bobcat series:
  New
Status in OpenStack Compute (nova) zed series:
  New

Bug description:
  Description
  ===========

  After upgrade of nova, including compute and conductor nodes, VM
  rebuild fails. All computes, that have service state UP, and all
  conductors are having version 66. Though, there was 1 compute during
  upgrade that is DOWN, which does have version 64.

  Due to it conductor negotiates minimal version to 64, which is still
  acceptable minimal RPC version though that leads to not passing
  another required argument.

  
  Steps to reproduce
  ==================

  * Setup env with Nova version 26.2.0
  * Perform upgrade to 27.1.0 where 1 compute will be down or not upgraded (and thus can't update it's rpc version to latest 66)
  * Try to re-build the VM: openstack server rebuild <server_uuid> --image <image_uuid>

  Expected result
  ===============

  VM is rebuild

  
  Actual result
  =============

  VM is stuck in rebuilding state with following trace in nova-compute

  
  Logs & Configs
  ==============
  Stack trace from nova-compute:
  https://paste.openstack.org/show/biUIcOzMCx0YlsFob2KK/

  Nova-conductor does negotiation by minimal version:
  INFO nova.compute.rpcapi [None req-2670be51-8233-4269-ac6a-f49486e8893d - - - - - -] Automatically selected compute RPC version 6.1 from minimum service version 64

  Potentially, there's another issue upgrading from Yoga to 2023.1 related to this:
  https://github.com/openstack/nova/commit/30aab9c234035b49c7e2cdc940f624a63eeffc1b#diff-47eb12598e353b9e0689707d7b477353200d0aa3ed13045ffd3d017ee7d9e753R3709

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