It seems it started happening with the move to xenial, so maybe a libvirt issue. https://bugs.launchpad.net/tacker/+bug/1515768 is a previous occurrence of it.
Adding nova has thre is a 500, so there ought to be a bug. ** Also affects: nova Importance: Undecided Status: New -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1643268 Title: test_cancel_update_server_with_port failing with non-convergence intermittently Status in heat: New Status in OpenStack Compute (nova): New Bug description: test_cancel_update_server_with_port seems to be failing[1] intermittently with non-convergence with 2016-11-20 04:36:45.142985 | 2016-11-20 04:36:45.141 | heat_integrationtests.common.exceptions.StackBuildErrorException: Stack CancelUpdateTest-297766966/b0208a66-631e-4716-8785-91819afaf1a5 is in ROLLBACK_FAILED status due to 'ClientException: resources.Server: Failed to attach network adapter device to 01ce1b55 -167d-4b16-a265-35661f4c1b48 (HTTP 500) (Request-ID: req- c7044e7e-b245-4d78-9709-b92c544673b9)' From the nova logs it looks like a libvirt error[2]. Not checked if this is a nova issue or not. Filing this bug to track it. [1] http://logs.openstack.org/76/398476/1/gate/gate-heat-dsvm-functional-orig-mysql-lbaasv2-ubuntu-xenial/1e38d87/console.html#_2016-11-20_04_36_45_142985 [2] http://logs.openstack.org/76/398476/1/gate/gate-heat-dsvm- functional-orig-mysql-lbaasv2-ubuntu- xenial/1e38d87/logs/screen-n-cpu.txt.gz?level=ERROR#_2016-11-20_04_26_56_121 To manage notifications about this bug go to: https://bugs.launchpad.net/heat/+bug/1643268/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp