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[Slawek Kaplonski <1834079@xxxxxxxxxxxxxxxxxx>]

I have no idea why it started failing around 21st of June but IMO it is
related to using lib/neutron instead of lib/neutron-legacy on subsides.

Please look at Devstack log from master branch ("good" run): http://logs.openstack.org/35/667035/4/check/tempest-slow-py3/ec61a4e/compute1/logs/devstacklog.txt.gz#_2019-06-24_15_31_24_020 - br-ex is created by devstack there.
And in case of failed run which You pointed, bridge isn't created.

I "fixed" it in master branch some time ago:
https://review.opendev.org/#/c/662480/ and now proposed backport to
stein: https://review.opendev.org/#/c/667216/ and rocky:
https://review.opendev.org/#/c/667218/

** Also affects: devstack
   Importance: Undecided
       Status: New

** Changed in: devstack
     Assignee: (unassigned) => Slawek Kaplonski (slaweq)

** No longer affects: neutron

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https://bugs.launchpad.net/bugs/1834079

Title:
  "Bridge br-ex for physical network public does not exist. Agent
  terminated!" in tempest-slow job(s) on stable branches

Status in devstack:
  New

Bug description:
  Seen in a stable/stein change here:

  http://logs.openstack.org/43/665143/1/check/tempest-slow-
  py3/c36a4a8/compute1/logs/screen-neutron-
  agent.txt.gz?level=TRACE#_Jun_24_10_58_51_041785

  Jun 24 10:58:50.296667 ubuntu-bionic-ovh-gra1-0008250201 neutron-
  openvswitch-agent[15936]: ERROR ovsdbapp.backend.ovs_idl.idlutils [-]
  Unable to open stream to tcp:127.0.0.1:6640 to retrieve schema:
  Connection refused

  Jun 24 10:58:51.041785 ubuntu-bionic-ovh-gra1-0008250201 neutron-
  openvswitch-agent[15936]: ERROR
  neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [None
  req-c7de08ad-67af-4e9f-91aa-37bc0ec08deb None None] Bridge br-ex for
  physical network public does not exist. Agent terminated!

  This seems to only show up in the tempest-slow* jobs on stable
  branches for some reason:

  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Bridge
  %20br-
  ex%20for%20physical%20network%20public%20does%20not%20exist.%20Agent%20terminated!%5C%22%20AND%20tags%3A%5C
  %22screen-neutron-agent.txt%5C%22&from=7d

  It also appears that this started around June 21.

  The tempest-slow job runs slow scenario tests that other jobs like
  tempest-full won't run, e.g.:

  TestNetworkAdvancedServerOps.test_server_connectivity_cold_migration
  TestNetworkAdvancedServerOps.test_server_connectivity_live_migration
  TestNetworkAdvancedServerOps.test_server_connectivity_resize

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