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[Gaël THEROND <2048097@xxxxxxxxxxxxxxxxxx>]

Complementary information for those who would be the same case than me:

First, the patch is for source based image, if you're building from
binary that won't work as the dependency graph is computed from the
CentOS Cloud SIG repository which call for unpatched 0.6.6 release as
yoga release is EOL/UNMAINTAINED.

Second, even if using the sources method, you won't be able to build a
working image without few tricks as would it be CentOS 8 Stream or
CentOS 9 Stream, they do not provide fixed pyroute2 library.

The patch relying on the distribution packages to provide a greater
version than what the neutron archive upper-constraints.txt request not
gonna work in here as CentOS rely on EPEL for this library and as of
this day (07/23/2024) the only provided package is
python3-pyroute2-0.5.14 which doesn't contain the appropriate flags
matching patch.

So, in order to fix while using CentOS Based image, the only solution
is:

1°/ - Use source based images (No luck with binary images, sorry).
2°/ - Override the neutron image upper-constraints.txt pyroute2 version with version 0.6.10 (0.6.11 is preferred).

Point 2 can be achieve using openstack-base or neutron-base blocks
override or just a plain dirty patch of the Dockerfile template itself
depending on your CI workflow.

** Changed in: nova
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/2048097

Title:
  VIF unplug operation failing on Rocky Linux 9.3 (Yoga)

Status in OpenStack Compute (nova):
  Fix Released

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

  VIF unplug operations are failing on Rocky Linux 9.3 with stable/yoga.
  This is caused by incompatibility between pyroute2 0.6.6 (yoga u-c)
  and the Rocky Linux 9.3 kernel.

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

  * Launch a virtual machine
  * Try to resize the virtual machine

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

  The resize operation succeeds (assuming enough resources are
  available).

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

  The resize operation will fail and a similar traceback will be logged
  in nova-compute:

  Traceback (most recent call last):
    File "/var/lib/kolla/venv/lib/python3.9/site-packages/os_vif/__init__.py", line 110, in unplug
      plugin.unplug(vif, instance_info)
    File "/var/lib/kolla/venv/lib/python3.9/site-packages/vif_plug_ovs/ovs.py", line 445, in unplug
      self._unplug_bridge(vif, instance_info)
    File "/var/lib/kolla/venv/lib/python3.9/site-packages/vif_plug_ovs/ovs.py", line 376, in _unplug_bridge
      linux_net.delete_bridge(vif.bridge_name, v1_name)
    File "/var/lib/kolla/venv/lib/python3.9/site-packages/oslo_privsep/priv_context.py", line 271, in _wrap
      return self.channel.remote_call(name, args, kwargs,
    File "/var/lib/kolla/venv/lib/python3.9/site-packages/oslo_privsep/daemon.py", line 215, in remote_call
      raise exc_type(*result[2])
  pr2modules.netlink.exceptions.NetlinkError: (95, 'Operation not supported')

  Note that this was resolved in Ubuntu by backporting a fix from
  pyroute2 0.6.10. For more details see
  https://bugs.launchpad.net/ubuntu/+source/pyroute2/+bug/1995469

  We successfully reproduced the fix by backporting the following
  commit:
  https://github.com/svinota/pyroute2/commit/1eb08312de30a083bcfddfaa9c1d5e124b6368df

  Environment
  ===========

  This should be reproducible with Nova stable/yoga at the time of writing, when running on Rocky Linux 9.3:
  5.14.0-362.8.1.el9_3.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Nov 8 17:36:32 UTC 2023

  Hypervisor is KVM:
  qemu-kvm-7.2.0-14.el9_2.5.x86_64
  libvirt-daemon-9.0.0-10.3.el9_2.x86_64

  Storage is Ceph (Quincy).

  Networking is Neutron with OpenVSwitch.

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