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[Bug 2068644] [NEW] Issue associating floating IP with OVN load balancer

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Public bug reported:

Version: yoga

I'm seeing this failure when trying to associate a floating IP to a OVN
based loadbalancer:

    Maintenance task: Failed to fix resource 990f1d44-2401-49ba-b8c5-aedf7fb0c1ec (type: floatingips): TypeError: 'NoneType' object is not iterable
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance Traceback (most recent call last):
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py", line 400, in check_for_inconsistencies
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     self._fix_create_update(admin_context, row)
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py", line 239, in _fix_create_update
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     res_map['ovn_create'](context, n_obj)
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py", line 467, in _create_floatingip_and_pf
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     self._ovn_client.create_floatingip(context, floatingip)
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 1201, in create_floatingip
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     LOG.error('Unable to create floating ip in gateway '
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     self.force_reraise()
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     raise self.value
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 1197, in create_floatingip
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     self._create_or_update_floatingip(floatingip, txn=txn)
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 1007, in _create_or_update_floatingip
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     commands.extend(
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance TypeError: 'NoneType' object is not iterable
    2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance 

Unsure if that is masking another issue, but seems like even in master
_handle_lb_fip_cmds can return None e.g:

https://github.com/openstack/neutron/blob/11027e3e1ef9a58d5b2faa575a3764bd33cd2a08/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py#L975

Unsure of the consqeuences of returning an empty list instead. Would
that allow floating IP association to succeed?

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2068644

Title:
  Issue associating floating IP with OVN load balancer

Status in neutron:
  New

Bug description:
  Version: yoga

  I'm seeing this failure when trying to associate a floating IP to a
  OVN based loadbalancer:

      Maintenance task: Failed to fix resource 990f1d44-2401-49ba-b8c5-aedf7fb0c1ec (type: floatingips): TypeError: 'NoneType' object is not iterable
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance Traceback (most recent call last):
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py", line 400, in check_for_inconsistencies
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     self._fix_create_update(admin_context, row)
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py", line 239, in _fix_create_update
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     res_map['ovn_create'](context, n_obj)
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/maintenance.py", line 467, in _create_floatingip_and_pf
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     self._ovn_client.create_floatingip(context, floatingip)
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 1201, in create_floatingip
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     LOG.error('Unable to create floating ip in gateway '
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     self.force_reraise()
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     raise self.value
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 1197, in create_floatingip
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     self._create_or_update_floatingip(floatingip, txn=txn)
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance   File "/var/lib/kolla/venv/lib/python3.9/site-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py", line 1007, in _create_or_update_floatingip
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance     commands.extend(
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance TypeError: 'NoneType' object is not iterable
      2024-06-06 15:25:22.565 40 ERROR neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.maintenance 

  Unsure if that is masking another issue, but seems like even in master
  _handle_lb_fip_cmds can return None e.g:

  https://github.com/openstack/neutron/blob/11027e3e1ef9a58d5b2faa575a3764bd33cd2a08/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovn_client.py#L975

  Unsure of the consqeuences of returning an empty list instead. Would
  that allow floating IP association to succeed?

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