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[Bug 1936959] [NEW] [OVN Octavia Provider] Unable to delete Load Balancer with PENDING_DELETE

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Public bug reported:

While attempting to delete a Load Balancer the provisioning status is
moved to PENDING_DELETE and remains that way, blocking the deletion
process to finalize.

The following tracebacks were found on the logs regarding that specific
lb:

2021-07-17 13:49:26.131 19 INFO octavia.api.v2.controllers.load_balancer [req-b8b3cbd8-3014-4c45-9680-d4c67346ed1c - 1e38d4dfbfb7427787725df69fabc22b - default default] Sending delete Load Balancer 19d8e465-c704-40a9-b1fd-5b0824408e5d to provider ovn
2021-07-17 13:49:26.139 19 DEBUG ovn_octavia_provider.helper [-] Handling request lb_delete with info {'id': '19d8e465-c704-40a9-b1fd-5b0824408e5d', 'cascade': True} request_handler /usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py:303
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper [-] Exception occurred during deletion of loadbalancer: RuntimeError: dictionary changed size during iteration
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper Traceback (most recent call last):
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py", line 907, in lb_delete
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     status = self._lb_delete(loadbalancer, ovn_lb, status)
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py", line 960, in _lb_delete
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     for ls in self._find_lb_in_table(ovn_lb, 'Logical_Switch'):
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py", line 289, in _find_lb_in_table
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     return [item for item in self.ovn_nbdb_api.tables[table].rows.values()
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py", line 289, in <listcomp>
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     return [item for item in self.ovn_nbdb_api.tables[table].rows.values()
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib64/python3.6/_collections_abc.py", line 761, in __iter__
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     for key in self._mapping:
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper RuntimeError: dictionary changed size during iteration
2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper
2021-07-17 13:49:26.446 13 DEBUG octavia.common.keystone [req-267feb7e-2235-43d9-bec8-88ff532b9019 - 1e38d4dfbfb7427787725df69fabc22b - default default] Request path is / and it does not require keystone authentication process_request /usr/lib/python3.6/site-packages/octavia/common/keystone.py:77
2021-07-17 13:49:26.554 19 DEBUG ovn_octavia_provider.helper [-] Updating status to octavia: {'loadbalancers': [{'id': '19d8e465-c704-40a9-b1fd-5b0824408e5d', 'provisioning_status': 'ERROR', 'operating_status': 'ERROR'}], 'listeners': [{'id': '0806594a-4ed7-4889-81fa-6fd8d02b0d80', 'provisioning_status': 'DELETED', 'operating_status': 'OFFLINE'}], 'pools': [{'id': 'b8a98db0-6d2e-4745-b533-d2eb3548d1b9', 'provisioning_status': 'DELETED'}], 'members': [{'id': '08464181-728b-425a-b690-d3eb656f7e0a', 'provisioning_status': 'DELETED'}]} _update_status_to_octavia /usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py:32

The problem here is that using rows.values() is inherently racy as if
there are multiple threads running this can happen eventually.

** Affects: neutron
     Importance: High
     Assignee: Brian Haley (brian-haley)
         Status: In Progress


** Tags: ovn-octavia-provider

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https://bugs.launchpad.net/bugs/1936959

Title:
  [OVN Octavia Provider] Unable to delete Load Balancer with
  PENDING_DELETE

Status in neutron:
  In Progress

Bug description:
  While attempting to delete a Load Balancer the provisioning status is
  moved to PENDING_DELETE and remains that way, blocking the deletion
  process to finalize.

  The following tracebacks were found on the logs regarding that
  specific lb:

  2021-07-17 13:49:26.131 19 INFO octavia.api.v2.controllers.load_balancer [req-b8b3cbd8-3014-4c45-9680-d4c67346ed1c - 1e38d4dfbfb7427787725df69fabc22b - default default] Sending delete Load Balancer 19d8e465-c704-40a9-b1fd-5b0824408e5d to provider ovn
  2021-07-17 13:49:26.139 19 DEBUG ovn_octavia_provider.helper [-] Handling request lb_delete with info {'id': '19d8e465-c704-40a9-b1fd-5b0824408e5d', 'cascade': True} request_handler /usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py:303
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper [-] Exception occurred during deletion of loadbalancer: RuntimeError: dictionary changed size during iteration
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper Traceback (most recent call last):
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py", line 907, in lb_delete
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     status = self._lb_delete(loadbalancer, ovn_lb, status)
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py", line 960, in _lb_delete
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     for ls in self._find_lb_in_table(ovn_lb, 'Logical_Switch'):
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py", line 289, in _find_lb_in_table
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     return [item for item in self.ovn_nbdb_api.tables[table].rows.values()
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py", line 289, in <listcomp>
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     return [item for item in self.ovn_nbdb_api.tables[table].rows.values()
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper   File "/usr/lib64/python3.6/_collections_abc.py", line 761, in __iter__
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper     for key in self._mapping:
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper RuntimeError: dictionary changed size during iteration
  2021-07-17 13:49:26.196 19 ERROR ovn_octavia_provider.helper
  2021-07-17 13:49:26.446 13 DEBUG octavia.common.keystone [req-267feb7e-2235-43d9-bec8-88ff532b9019 - 1e38d4dfbfb7427787725df69fabc22b - default default] Request path is / and it does not require keystone authentication process_request /usr/lib/python3.6/site-packages/octavia/common/keystone.py:77
  2021-07-17 13:49:26.554 19 DEBUG ovn_octavia_provider.helper [-] Updating status to octavia: {'loadbalancers': [{'id': '19d8e465-c704-40a9-b1fd-5b0824408e5d', 'provisioning_status': 'ERROR', 'operating_status': 'ERROR'}], 'listeners': [{'id': '0806594a-4ed7-4889-81fa-6fd8d02b0d80', 'provisioning_status': 'DELETED', 'operating_status': 'OFFLINE'}], 'pools': [{'id': 'b8a98db0-6d2e-4745-b533-d2eb3548d1b9', 'provisioning_status': 'DELETED'}], 'members': [{'id': '08464181-728b-425a-b690-d3eb656f7e0a', 'provisioning_status': 'DELETED'}]} _update_status_to_octavia /usr/lib/python3.6/site-packages/ovn_octavia_provider/helper.py:32

  The problem here is that using rows.values() is inherently racy as if
  there are multiple threads running this can happen eventually.

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