[Bug 2015090] Re: neutron.agent.dhcp.agent TypeError: 'bool' object is not subscriptable

[Felipe Reyes]

I think I found the root cause. This piece of code returns a True/False
instead of a device name[0], this is expected to be executed only when
there are network segments defined, although in this testing environment
there aren't, I'm collecting more information to understand and confirm
if this assumption is correct.

The code in question was merged in this review
https://review.opendev.org/c/openstack/neutron/+/840421

[0]
https://opendev.org/openstack/neutron/src/tag/22.0.0/neutron/agent/dhcp/agent.py#L219-L234

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Title:
  neutron.agent.dhcp.agent TypeError: 'bool' object is not subscriptable

Status in OpenStack Neutron Open vSwitch Charm:
  New
Status in neutron package in Ubuntu:
  New

Bug description:
  [Impact]

  In a fresh jammy-antelope environment the metadata service is not
  available to the overcloud deployed instances, this is an environment
  using neutron-openvswitch environment (not OVN), when looking into the
  logs the stacktrace below is suspicious. The metadata service becomes
  available when restarting the services (e.g. juju config neutron-
  openvswitch debug=True)

  [Test Case]

  ```
  git clone https://opendev.org/openstack/charm-neutron-openvswitch
  cd charm-neutron-openvswitch
  git review -d https://review.opendev.org/c/openstack/charm-neutron-openvswitch/+/873819
  tox -e build  # make sure charmcraft-2.1 is installed before
  tox -e func-target -- jammy-antelope
  ```

  [Stacktrace]

  2023-03-31 19:35:06.093 58625 DEBUG neutron.agent.dhcp.agent [-] Calling driver for network: 6d246d86-11b5-4d5f-aa9c-c2bcbcc28b62/seg=None action: get_metadata_bind_interface _call_driver /usr/lib/python3/dist-packages/neutron/agent/dhcp/agent.py:242
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent [-] 'bool' object is not subscriptable: TypeError: 'bool' object is not subscriptable
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/common/utils.py", line 182, in call
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     return func(*args, **kwargs)
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/dhcp/agent.py", line 434, in safe_configure_dhcp_for_network
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     self.configure_dhcp_for_network(network)
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/osprofiler/profiler.py", line 159, in wrapper
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     result = f(*args, **kwargs)
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/dhcp/agent.py", line 447, in configure_dhcp_for_network
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     self.update_isolated_metadata_proxy(network)
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/osprofiler/profiler.py", line 159, in wrapper
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     result = f(*args, **kwargs)
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/dhcp/agent.py", line 763, in update_isolated_metadata_proxy
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     self.enable_isolated_metadata_proxy(network)
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/osprofiler/profiler.py", line 159, in wrapper
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     result = f(*args, **kwargs)
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/dhcp/agent.py", line 819, in enable_isolated_metadata_proxy
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     metadata_driver.MetadataDriver.spawn_monitored_metadata_proxy(
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/metadata/driver.py", line 244, in spawn_monitored_metadata_proxy
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     ip_lib.IpAddrCommand(
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/ip_lib.py", line 609, in wait_until_address_ready
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     common_utils.wait_until_true(
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/common/utils.py", line 744, in wait_until_true
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     while not predicate():
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/ip_lib.py", line 594, in is_address_ready
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     addr_info = self.list(to=address)[0]
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/ip_lib.py", line 574, in list
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     devices = get_devices_with_ip(self._parent.namespace, name=self.name,
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/ip_lib.py", line 431, in name
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     return self._parent.name
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/ip_lib.py", line 416, in name
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent     return self._name[:constants.DEVICE_NAME_MAX_LEN]
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent TypeError: 'bool' object is not subscriptable
  2023-03-31 19:35:06.095 58625 ERROR neutron.agent.dhcp.agent 
  2023-03-31 19:35:06.099 58625 INFO neutron.agent.dhcp.agent [None req-4298bc12-95ea-476c-8503-7258e4454721 - - - - - -] Synchronizing state complete

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