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[Bug 1820337] Re: test_bfv_quota_race_local_delete intermittently fails with testtools.matchers._impl.MismatchError: ['bfv'] != []

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Matt Riedemann <mriedem.os@xxxxxxxxx>
Date: Tue, 26 Mar 2019 15:05:39 -0000
Reply-to: Bug 1820337 <1820337@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Changed in: nova
     Assignee: Matt Riedemann (mriedem) => Matthew Booth (mbooth-9)

** Also affects: nova/queens
   Importance: Undecided
       Status: New

** Also affects: nova/stein
   Importance: Undecided
       Status: New

** Also affects: nova/pike
   Importance: Undecided
       Status: New

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1820337

Title:
  test_bfv_quota_race_local_delete intermittently fails with
  testtools.matchers._impl.MismatchError: ['bfv'] != []

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) pike series:
  New
Status in OpenStack Compute (nova) queens series:
  New
Status in OpenStack Compute (nova) rocky series:
  New
Status in OpenStack Compute (nova) stein series:
  New

Bug description:
  Seen here:

  http://logs.openstack.org/72/640772/1/gate/nova-tox-functional-
  py35/44118f7/job-output.txt.gz#_2019-03-13_18_36_04_685027

  2019-03-13 18:36:04.685027 | ubuntu-xenial | {2} nova.tests.functional.regressions.test_bug_1806064.BootFromVolumeOverQuotaRaceDeleteTest.test_bfv_quota_race_local_delete [2.015433s] ... FAILED
  2019-03-13 18:36:04.685120 | ubuntu-xenial |
  2019-03-13 18:36:04.685187 | ubuntu-xenial | Captured traceback:
  2019-03-13 18:36:04.685251 | ubuntu-xenial | ~~~~~~~~~~~~~~~~~~~
  2019-03-13 18:36:04.685350 | ubuntu-xenial |     b'Traceback (most recent call last):'
  2019-03-13 18:36:04.685658 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/nova/tests/functional/regressions/test_bug_1806064.py", line 129, in test_bfv_quota_race_local_delete'
  2019-03-13 18:36:04.685776 | ubuntu-xenial |     b"    self.assertEqual(['bfv'], server['tags'])"
  2019-03-13 18:36:04.686080 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/testtools/testcase.py", line 411, in assertEqual'
  2019-03-13 18:36:04.686207 | ubuntu-xenial |     b'    self.assertThat(observed, matcher, message)'
  2019-03-13 18:36:04.686487 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/testtools/testcase.py", line 498, in assertThat'
  2019-03-13 18:36:04.686569 | ubuntu-xenial |     b'    raise mismatch_error'
  2019-03-13 18:36:04.686699 | ubuntu-xenial |     b"testtools.matchers._impl.MismatchError: ['bfv'] != []"
  2019-03-13 18:36:04.686740 | ubuntu-xenial |     b''
  2019-03-13 18:36:04.686770 | ubuntu-xenial |
  2019-03-13 18:36:04.686838 | ubuntu-xenial | Captured pythonlogging:
  2019-03-13 18:36:04.686905 | ubuntu-xenial | ~~~~~~~~~~~~~~~~~~~~~~~
  2019-03-13 18:36:04.695625 | ubuntu-xenial |     b"2019-03-13 18:36:02,849 INFO [nova.api.openstack.placement.objects.resource_provider] Synced traits from os_traits into API DB: {'HW_NIC_SRIOV_QOS_RX', 'HW_CPU_X86_SVM', 'HW_CPU_X86_AVX512VL', 'HW_GPU_API_DIRECT3D_V9_0', 'HW_NIC_OFFLOAD_SG', 'HW_NIC_OFFLOAD_TSO', 'HW_NIC_OFFLOAD_GSO', 'HW_GPU_API_CUDA_V2_0', 'HW_GPU_RESOLUTION_W3840H2160', 'HW_GPU_API_OPENGL_V1_2', 'HW_CPU_X86_AVX2', 'HW_GPU_API_CUDA_V7_0', 'HW_CPU_X86_AVX512BW', 'HW_CPU_HYPERTHREADING', 'HW_NIC_SRIOV_TRUSTED', 'HW_GPU_RESOLUTION_W2560H1600', 'HW_CPU_X86_TBM', 'HW_GPU_API_OPENGL_V4_2', 'HW_NIC_OFFLOAD_RX', 'HW_NIC_OFFLOAD_TXVLAN', 'HW_NIC_ACCEL_ECC', 'HW_CPU_X86_AVX512CD', 'HW_NIC_VMDQ', 'HW_GPU_MAX_DISPLAY_HEADS_1', 'HW_CPU_AARCH64_SHA512', 'HW_GPU_API_OPENGL_V3_3', 'HW_GPU_RESOLUTION_W800H600', 'HW_CPU_AARCH64_SM4', 'COMPUTE_VOLUME_ATTACH_WITH_TAG', 'HW_CPU_AARCH64_ASIMDHP', 'HW_CPU_AARCH64_DCPOP', 'HW_CPU_AARCH64_FCMA', 'HW_GPU_API_OPENCL_V2_0', 'HW_NIC_ACCEL_RSA', 'HW_GPU_API_VULKAN', 'HW_GPU_MAX_DISPLAY_HEADS_2', 'HW_NIC_DCB_PFC', 'HW_GPU_API_DIRECT3D_V9_0L', 'HW_NIC_MULTIQUEUE', 'HW_GPU_RESOLUTION_W1600H1200', 'HW_CPU_X86_CLMUL', 'HW_GPU_API_CUDA_V7_1', 'HW_CPU_AARCH64_FPHP', 'HW_GPU_RESOLUTION_W640H480', 'HW_CPU_AARCH64_PMULL', 'HW_NIC_OFFLOAD_TXUDP', 'HW_GPU_MAX_DISPLAY_HEADS_6', 'HW_NIC_ACCEL_SSL', 'HW_CPU_X86_3DNOW', 'STORAGE_DISK_SSD', 'HW_GPU_RESOLUTION_W1680H1050', 'HW_NIC_DCB_ETS', 'HW_CPU_X86_SSE2', 'HW_NIC_OFFLOAD_RXHASH', 'HW_GPU_API_CUDA_V6_0', 'MISC_SHARES_VIA_AGGREGATE', 'HW_GPU_RESOLUTION_W1152H864', 'HW_CPU_X86_MPX', 'HW_GPU_RESOLUTION_W1360H768', 'HW_GPU_API_OPENGL_V1_5', 'HW_CPU_X86_F16C', 'HW_GPU_RESOLUTION_W1024H600', 'HW_CPU_X86_AVX512F', 'HW_GPU_API_DIRECT3D_V9_0B', 'HW_NIC_OFFLOAD_QINQ', 'HW_GPU_RESOLUTION_W1024H768', 'HW_GPU_API_OPENGL_V4_3', 'HW_GPU_API_OPENGL_V2_0', 'HW_GPU_API_DIRECT3D_V8_1', 'HW_NIC_OFFLOAD_GRO', 'HW_GPU_RESOLUTION_W1366H768', 'HW_CPU_X86_AVX512ER', 'HW_NIC_OFFLOAD_UFO', 'HW_CPU_AARCH64_SVE', 'HW_GPU_RESOLUTION_W1280H800', 'HW_NIC_ACCEL_LZS', 'COMPUTE_DEVICE_TAGGING', 'HW_CPU_AARCH64_ATOMICS', 'HW_NIC_OFFLOAD_RXVLAN', 'HW_GPU_API_CUDA_V5_0', 'HW_GPU_API_OPENCL_V1_0', 'HW_CPU_X86_BMI2', 'HW_CPU_X86_MMX', 'COMPUTE_VOLUME_MULTI_ATTACH', 'HW_NIC_OFFLOAD_LRO', 'HW_GPU_API_CUDA_V3_2', 'HW_NIC_OFFLOAD_UCS', 'COMPUTE_TRUSTED_CERTS', 'HW_CPU_AARCH64_ASIMDRDM', 'HW_NIC_OFFLOAD_SCS', 'COMPUTE_NET_ATTACH_INTERFACE', 'HW_CPU_AARCH64_SHA3', 'HW_CPU_X86_SSSE3', 'COMPUTE_VOLUME_EXTEND', 'HW_GPU_RESOLUTION_W1600H900', 'HW_GPU_API_OPENCL_V2_1', 'HW_CPU_AARCH64_CRC32', 'HW_GPU_API_OPENGL_V4_4', 'HW_GPU_API_DIRECTX_V10', 'HW_GPU_API_CUDA_V6_2', 'HW_GPU_API_OPENCL_V1_2', 'HW_GPU_API_OPENGL_V2_1', 'HW_GPU_API_DIRECT3D_V10_1', 'HW_NIC_ACCEL_IPSEC', 'HW_CPU_AARCH64_EVTSTRM', 'HW_CPU_X86_FMA3', 'HW_GPU_API_OPENGL_V4_0', 'HW_NIC_ACCEL_DEFLATE', 'HW_NIC_OFFLOAD_TX', 'HW_CPU_X86_SSE41', 'HW_GPU_API_OPENCL_V1_1', 'HW_NIC_OFFLOAD_SWITCHDEV', 'HW_GPU_API_OPENGL_V3_1', 'HW_NIC_OFFLOAD_GRE', 'HW_CPU_AARCH64_FP', 'HW_GPU_RESOLUTION_W1440H900', 'HW_GPU_API_DIRECT3D_V6_0', 'HW_NIC_SRIOV', 'HW_CPU_AARCH64_ASIMDDP', 'HW_GPU_API_OPENGL_V4_5', 'HW_CPU_X86_SSE', 'HW_CPU_X86_SSE4A', 'HW_CPU_X86_XOP', 'HW_NIC_SRIOV_MULTIQUEUE', 'HW_CPU_X86_SHA', 'HW_CPU_AARCH64_SM3', 'HW_GPU_RESOLUTION_W1280H768', 'HW_GPU_RESOLUTION_W1920H1080', 'HW_NIC_OFFLOAD_LSO', 'HW_GPU_RESOLUTION_W320H240', 'COMPUTE_VOLUME_ATTACH', 'HW_GPU_API_CUDA_V6_1', 'HW_GPU_API_DIRECT3D_V12_0', 'HW_CPU_AARCH64_ASIMD', 'HW_CPU_X86_ABM', 'HW_CPU_X86_AVX512DQ', 'HW_GPU_RESOLUTION_W7680H4320', 'HW_GPU_API_CUDA_V5_2', 'HW_CPU_X86_VMX', 'HW_GPU_API_DIRECT3D_V8_0', 'HW_GPU_API_CUDA_V1_0', 'HW_GPU_RESOLUTION_W2560H1440', 'HW_CPU_X86_SSE3', 'HW_GPU_API_DIRECT3D_V9_0C', 'HW_NIC_OFFLOAD_GENEVE', 'HW_GPU_API_CUDA_V3_7', 'HW_CPU_X86_FMA4', 'HW_GPU_API_DIRECT2D', 'HW_CPU_AARCH64_CPUID', 'HW_NIC_SRIOV_QOS_TX', 'HW_CPU_X86_AVX', 'HW_CPU_X86_AVX512PF', 'HW_CPU_AARCH64_AES', 'HW_GPU_API_CUDA_V1_1', 'COMPUTE_NET_ATTACH_INTERFACE_WITH_TAG', 'HW_GPU_MAX_DISPLAY_HEADS_4', 'HW_CPU_AARCH64_LRCPC', 'HW_GPU_API_OPENGL_V3_2', 'HW_GPU_API_OPENGL_V1_3', 'HW_CPU_X86_ASF', 'HW_CPU_X86_TSX', 'HW_GPU_API_CUDA_V3_5', 'HW_GPU_API_DIRECT3D_V11_2', 'HW_GPU_API_CUDA_V1_2', 'STORAGE_DISK_HDD', 'HW_CPU_AARCH64_SHA1', 'HW_GPU_API_DIRECT3D_V11_0', 'HW_CPU_X86_SGX', 'HW_NIC_PROGRAMMABLE_PIPELINE', 'HW_GPU_API_DIRECTX_V12', 'HW_NIC_OFFLOAD_FDF', 'HW_NIC_DCB_QCN', 'HW_GPU_API_DXVA', 'HW_CPU_X86_BMI', 'HW_NIC_OFFLOAD_L2CRC', 'HW_GPU_MAX_DISPLAY_HEADS_8', 'HW_GPU_API_OPENGL_V1_4', 'HW_GPU_API_OPENGL_V3_0', 'HW_GPU_API_CUDA_V1_3', 'HW_GPU_API_OPENGL_V4_1', 'HW_CPU_AARCH64_JSCVT', 'HW_GPU_API_OPENCL_V2_2', 'HW_NIC_ACCEL_TLS', 'HW_GPU_RESOLUTION_W1920H1200', 'HW_GPU_API_DIRECT3D_V11_3', 'HW_GPU_API_CUDA_V2_1', 'HW_GPU_API_CUDA_V5_3', 'HW_NIC_OFFLOAD_RDMA', 'HW_GPU_RESOLUTION_W1280H1024', 'HW_GPU_API_DIRECT3D_V11_1', 'HW_GPU_RESOLUTION_W1280H720', 'HW_GPU_API_CUDA_V3_0', 'HW_GPU_API_DIRECTX_V11', 'HW_GPU_API_DIRECT3D_V10_0', 'HW_NIC_OFFLOAD_TCS', 'HW_CPU_AARCH64_SHA2', 'HW_NIC_OFFLOAD_VXLAN', 'HW_CPU_X86_AESNI', 'HW_GPU_API_OPENGL_V1_1', 'HW_NIC_ACCEL_DIFFIEH', 'HW_CPU_X86_SSE42', 'HW_GPU_API_DIRECT3D_V7_0'}"
  2019-03-13 18:36:04.695837 | ubuntu-xenial |     b'2019-03-13 18:36:03,394 INFO [nova.service] Starting conductor node (version 18.1.1)'
  2019-03-13 18:36:04.696023 | ubuntu-xenial |     b'2019-03-13 18:36:03,418 INFO [nova.service] Starting scheduler node (version 18.1.1)'
  2019-03-13 18:36:04.696222 | ubuntu-xenial |     b"2019-03-13 18:36:03,447 INFO [nova.virt.driver] Loading compute driver 'fake.SmallFakeDriver'"
  2019-03-13 18:36:04.696401 | ubuntu-xenial |     b'2019-03-13 18:36:03,447 INFO [nova.service] Starting compute node (version 18.1.1)'
  2019-03-13 18:36:04.696782 | ubuntu-xenial |     b'2019-03-13 18:36:03,478 WARNING [nova.compute.manager] No compute node record found for host compute. If this is the first time this service is starting on this host, then you can ignore this warning.'
  2019-03-13 18:36:04.697117 | ubuntu-xenial |     b'2019-03-13 18:36:03,478 WARNING [nova.compute.monitors] Excluding nova.compute.monitors.cpu monitor virt_driver. Not in the list of enabled monitors (CONF.compute_monitors).'
  2019-03-13 18:36:04.697340 | ubuntu-xenial |     b'2019-03-13 18:36:03,483 WARNING [nova.compute.resource_tracker] No compute node record for compute:fake-mini'
  2019-03-13 18:36:04.697649 | ubuntu-xenial |     b'2019-03-13 18:36:03,488 INFO [nova.compute.resource_tracker] Compute node record created for compute:fake-mini with uuid: 01b19de8-1ab7-4e7b-ab4d-e075de00ccc8'
  2019-03-13 18:36:04.705131 | ubuntu-xenial |     b'2019-03-13 18:36:03,523 INFO [nova.api.openstack.placement.requestlog] 127.0.0.1 "GET /placement/resource_providers/01b19de8-1ab7-4e7b-ab4d-e075de00ccc8/allocations" status: 404 len: 303 microversion: 1.0'
  2019-03-13 18:36:04.705527 | ubuntu-xenial |     b'2019-03-13 18:36:03,524 INFO [nova.compute.resource_tracker] Final resource view: name=fake-mini phys_ram=8192MB used_ram=512MB phys_disk=1028GB used_disk=0GB total_vcpus=2 used_vcpus=0 pci_stats=[]'
  2019-03-13 18:36:04.705934 | ubuntu-xenial |     b'2019-03-13 18:36:03,545 INFO [nova.api.openstack.placement.requestlog] 127.0.0.1 "GET /placement/resource_providers?in_tree=01b19de8-1ab7-4e7b-ab4d-e075de00ccc8" status: 200 len: 26 microversion: 1.14'
  2019-03-13 18:36:04.706247 | ubuntu-xenial |     b'2019-03-13 18:36:03,555 INFO [nova.api.openstack.placement.requestlog] 127.0.0.1 "POST /placement/resource_providers" status: 200 len: 832 microversion: 1.20'
  2019-03-13 18:36:04.706700 | ubuntu-xenial |     b'2019-03-13 18:36:03,556 INFO [nova.scheduler.client.report] [req-c1e03ec8-485a-4fd2-8447-521ee1d3b2e1] Created resource provider record via placement API for resource provider with UUID 01b19de8-1ab7-4e7b-ab4d-e075de00ccc8 and name fake-mini.'
  2019-03-13 18:36:04.707086 | ubuntu-xenial |     b'2019-03-13 18:36:03,567 INFO [nova.api.openstack.placement.requestlog] 127.0.0.1 "GET /placement/resource_providers/01b19de8-1ab7-4e7b-ab4d-e075de00ccc8/inventories" status: 200 len: 54 microversion: 1.0'
  2019-03-13 18:36:04.707475 | ubuntu-xenial |     b'2019-03-13 18:36:03,585 INFO [nova.api.openstack.placement.requestlog] 127.0.0.1 "PUT /placement/resource_providers/01b19de8-1ab7-4e7b-ab4d-e075de00ccc8/inventories" status: 200 len: 399 microversion: 1.26'
  2019-03-13 18:36:04.707738 | ubuntu-xenial |     b'2019-03-13 18:36:03,592 INFO [nova.api.openstack.requestlog] 127.0.0.1 "GET /v2.1" status: 204 len: 0 microversion: - time: 0.000460'
  2019-03-13 18:36:04.708095 | ubuntu-xenial |     b'2019-03-13 18:36:03,632 INFO [nova.api.openstack.requestlog] 127.0.0.1 "GET /v2.1/6f70656e737461636b20342065766572/flavors/detail" status: 200 len: 2747 microversion: 2.52 time: 0.034817'
  2019-03-13 18:36:04.708440 | ubuntu-xenial |     b'2019-03-13 18:36:03,770 INFO [nova.api.openstack.requestlog] 127.0.0.1 "POST /v2.1/6f70656e737461636b20342065766572/servers" status: 202 len: 480 microversion: 2.52 time: 0.132783'
  2019-03-13 18:36:04.708847 | ubuntu-xenial |     b'2019-03-13 18:36:03,814 INFO [nova.api.openstack.requestlog] 127.0.0.1 "GET /v2.1/6f70656e737461636b20342065766572/servers/8dba4237-4817-4f31-a930-35a8ab7e7469" status: 200 len: 1183 microversion: 2.52 time: 0.039646'
  2019-03-13 18:36:04.709248 | ubuntu-xenial |     b'2019-03-13 18:36:03,872 INFO [nova.api.openstack.placement.requestlog] 127.0.0.1 "GET /placement/allocation_candidates?limit=1000&resources=MEMORY_MB%3A512%2CVCPU%3A1" status: 200 len: 307 microversion: 1.25'
  2019-03-13 18:36:04.709610 | ubuntu-xenial |     b'2019-03-13 18:36:04,231 INFO [nova.api.openstack.placement.requestlog] 127.0.0.1 "GET /placement/allocations/8dba4237-4817-4f31-a930-35a8ab7e7469" status: 200 len: 19 microversion: 1.0'
  2019-03-13 18:36:04.709987 | ubuntu-xenial |     b'2019-03-13 18:36:04,263 INFO [nova.api.openstack.placement.requestlog] 127.0.0.1 "PUT /placement/allocations/8dba4237-4817-4f31-a930-35a8ab7e7469" status: 204 len: 0 microversion: 1.25'
  2019-03-13 18:36:04.710248 | ubuntu-xenial |     b'2019-03-13 18:36:04,315 WARNING [nova.scheduler.utils] Failed to compute_task_build_instances: test_bfv_quota_race_local_delete'
  2019-03-13 18:36:04.710436 | ubuntu-xenial |     b'2019-03-13 18:36:04,316 WARNING [nova.scheduler.utils] Setting instance to ERROR state.'
  2019-03-13 18:36:04.710629 | ubuntu-xenial |     b'2019-03-13 18:36:04,470 ERROR [oslo_messaging.rpc.server] Exception during message handling'
  2019-03-13 18:36:04.710727 | ubuntu-xenial |     b'Traceback (most recent call last):'
  2019-03-13 18:36:04.711030 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/oslo_messaging/rpc/server.py", line 163, in _process_incoming'
  2019-03-13 18:36:04.711144 | ubuntu-xenial |     b'    res = self.dispatcher.dispatch(message)'
  2019-03-13 18:36:04.711438 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/oslo_messaging/rpc/dispatcher.py", line 265, in dispatch'
  2019-03-13 18:36:04.711577 | ubuntu-xenial |     b'    return self._do_dispatch(endpoint, method, ctxt, args)'
  2019-03-13 18:36:04.711879 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/oslo_messaging/rpc/dispatcher.py", line 194, in _do_dispatch'
  2019-03-13 18:36:04.711979 | ubuntu-xenial |     b'    result = func(ctxt, **new_args)'
  2019-03-13 18:36:04.712232 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/nova/conductor/manager.py", line 1323, in schedule_and_build_instances'
  2019-03-13 18:36:04.712312 | ubuntu-xenial |     b'    cell_mapping_cache)'
  2019-03-13 18:36:04.712589 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/oslo_utils/excutils.py", line 220, in __exit__'
  2019-03-13 18:36:04.712670 | ubuntu-xenial |     b'    self.force_reraise()'
  2019-03-13 18:36:04.712955 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/oslo_utils/excutils.py", line 196, in force_reraise'
  2019-03-13 18:36:04.713077 | ubuntu-xenial |     b'    six.reraise(self.type_, self.value, self.tb)'
  2019-03-13 18:36:04.713325 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/.tox/py35/lib/python3.5/site-packages/six.py", line 693, in reraise'
  2019-03-13 18:36:04.713391 | ubuntu-xenial |     b'    raise value'
  2019-03-13 18:36:04.713645 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/nova/conductor/manager.py", line 1316, in schedule_and_build_instances'
  2019-03-13 18:36:04.713748 | ubuntu-xenial |     b'    orig_num_req=len(build_requests))'
  2019-03-13 18:36:04.714063 | ubuntu-xenial |     b'  File "/home/zuul/src/git.openstack.org/openstack/nova/nova/tests/functional/regressions/test_bug_1806064.py", line 96, in stub_check_num_instances_quota'
  2019-03-13 18:36:04.714174 | ubuntu-xenial |     b"    'test_bfv_quota_race_local_delete')"
  2019-03-13 18:36:04.714324 | ubuntu-xenial |     b'nova.exception.TooManyInstances: test_bfv_quota_race_local_delete'
  2019-03-13 18:36:04.714731 | ubuntu-xenial |     b'2019-03-13 18:36:04,475 INFO [nova.api.openstack.requestlog] 127.0.0.1 "GET /v2.1/6f70656e737461636b20342065766572/servers/8dba4237-4817-4f31-a930-35a8ab7e7469" status: 200 len: 1340 microversion: 2.52 time: 0.109376'
  2019-03-13 18:36:04.714777 | ubuntu-xenial |     b''

  Interestingly this seems to be only happening in stable branches:

  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22testtools.matchers._impl.MismatchError%3A%20%5B'bfv'%5D%20!%3D%20%5B%5D%5C%22%20AND%20tags%3A%5C%22console%5C%22&from=7d

To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1820337/+subscriptions
References

[Bug 1820337] [NEW] test_bfv_quota_race_local_delete intermittently fails with testtools.matchers._impl.MismatchError: ['bfv'] != []
From: Matt Riedemann, 2019-03-15