CI: featureset020 (all tempest tests) promotion job fails with timeout on mtu test

[Sagi (Sergey) Shnaidman]

periodic-tripleo-ci-centos-7-ovb-1ctlr_1comp-featureset020-master job fails as it's stuck before all tempest tests finish.

https://logs.rdoproject.org/openstack-periodic/periodic-tripleo-ci-centos-7-ovb-1ctlr_1comp-featureset020-master/27498d9/console.txt.gz#_2017-12-09_23_38_17_566

Seems like it's always stuck on test:
neutron_tempest_plugin.api.test_trunk_negative.TrunkTestMtusJSON.test_add_subport_with_mtu_greater_than_trunk

https://logs.rdoproject.org/openstack-periodic/periodic-tripleo-ci-centos-7-ovb-1ctlr_1comp-featureset020-master/d47fea8/undercloud/home/jenkins/tempest_output.log.txt.gz

[wes hayutin (weshayutin)]

Is this related? https://bugs.launchpad.net/tripleo/+bug/1731988

[Ronelle Landy (rlandy)]

Wes, no, atm the mtu test is in the skip list so this bug can't be about that test afaict. Will investigate more

[Ronelle Landy (rlandy)]

Actually my mistake - that is a different mtu test

[Ronelle Landy (rlandy)]

Looks like this error started on 12/08. The test passes on and before 12/07. Master only failure.

[Ronelle Landy (rlandy)]

Testing with:

https://review.openstack.org/#/c/528292
https://review.openstack.org/#/c/527249
https://review.openstack.org/#/c/509660/

to see if changing the neutron mtu settings to match interface mtu settings fixes the hang.

Results will be delayed due to RDO Cloud upgrade.

[Ronelle Landy (rlandy)]

fs020 is running and passing now:

https://logs.rdoproject.org/openstack-periodic/periodic-tripleo-ci-centos-7-ovb-1ctlr_1comp-featureset020-master/5473580/

Closing this out