neutron GET ports 500 error: 'NoneType' object has no attribute 'qos_policy_id'

[Eric K]

In congress dsvm gate job, neutron qos plugin began experiencing the following 500 error (master branch neutron==14.0.0.0b2.dev52):

2019-01-15 20:05:52,245 25432 INFO [tempest.lib.common.rest_client] Request (TestNeutronV2Driver:test_neutronv2_ports_tables): 500 GET http://146.20.110.24:9696/v2.0/ports 8.637s
2019-01-15 20:05:52,245 25432 DEBUG [tempest.lib.common.rest_client] Request - Headers: {'X-Auth-Token': '<omitted>', 'Accept': 'application/json', 'Content-Type': 'application/json'}
        Body: None
    Response - Headers: {u'x-openstack-request-id': 'req-7b3d042a-af94-419c-ab38-a698bfcc77f5', 'status': '500', u'date': 'Tue, 15 Jan 2019 20:05:52 GMT', u'connection': 'close', 'content-location': 'http://146.20.110.24:9696/v2.0/ports', u'content-type': 'application/json', u'content-length': '150'}
        Body: {"NeutronError": {"message": "Request Failed: internal server error while processing your request.", "type": "HTTPInternalServerError", "detail": ""}}

But less than a minute later the same call seems to succeed:
2019-01-15 20:06:06,165 25432 INFO [tempest.lib.common.rest_client] Request (TestNeutronV2Driver:test_neutronv2_ports_tables): 200 GET http://146.20.110.24:9696/v2.0/ports 3.911s
2019-01-15 20:06:06,166 25432 DEBUG [tempest.lib.common.rest_client] Request - Headers: {'X-Auth-Token': '<omitted>', 'Accept': 'application/json', 'Content-Type': 'application/json'}
        Body: None

Selected log neutron q-svc log:
ERROR neutron.pecan_wsgi.hooks.translation [None req-7b3d042a-af94-419c-ab38-a698bfcc77f5 tempest-TestNeutronV2Driver-1133229655 tempest-TestNeutronV2Driver-1133229655] GET failed.: AttributeError: 'NoneType' object has no attribute 'qos_policy_id'
[...]
ERROR oslo_messaging.rpc.server File "/opt/stack/new/neutron/neutron/services/qos/qos_plugin.py", line 102, in _extend_port_resource_request
ERROR oslo_messaging.rpc.server if net.qos_policy_id:
ERROR oslo_messaging.rpc.server AttributeError: 'NoneType' object has no attribute 'qos_policy_id'
[http://logs.openstack.org/74/621974/2/check/congress-devstack-api-mysql/8c0dd86/logs/screen-q-svc.txt.gz?level=ERROR#_Jan_15_20_07_10_822453]

The timing and the file suggests the error may have something to do with this recent neutron merge:
https://github.com/openstack/neutron/commit/83eb3e16138cbf3cd2df723020c07ac2f65c88ce

All environmental information is available here: http://logs.openstack.org/74/621974/2/check/congress-devstack-api-mysql/8c0dd86/
http://logs.openstack.org/74/621974/2/check/congress-devstack-api-mysql/8c0dd86/zuul-info/zuul-info.primary.txt

Additional logs are available here:
http://logs.openstack.org/74/621974/2/check/congress-devstack-api-mysql/8c0dd86/logs/

[Brian Haley (brian-haley)]

This is a duplicate of https://bugs.launchpad.net/neutron/+bug/1809134 - patch in progress https://review.openstack.org/#/c/626401/