Some additional information regarding how the bug was found:
During the upgrade the ovs runs, deleting the ports. They don't come
back, even after restarting the services, which suggests an issue within
the neutron openvswitch agent in terms of re-creating ports that have
been deleted.
from the ovsdb-tool -mm show-log tool on the neutron-gateway AFTER the
upgrade.
```
record 44: 2020-06-25 19:10:48.024
table Interface row "tap03282320-fb" (74bf6e22):
delete row
table Interface row "tap7e15b3c6-e3" (d331a9b6):
delete row
table Interface row "tap8e76995d-a6" (f8ca1e54):
delete row
table Port row "tap03282320-fb" (d891c2a5):
delete row
table Port row "tap7e15b3c6-e3" (8f105882):
delete row
table Port row "tap8e76995d-a6" (b5f389e0):
delete row
table Bridge row "br-int" (56555638):
ports=[704ecf79-ff42-44bd-a72c-c586f59f433b,
dcfd1c64-2e07-4bf7-8815-a96950384705, f38673c2-87c9-4ce1-b160-236637caf8d2]
table Open_vSwitch row 70200fb1 (70200fb1):
next_cfg=111
```
i.e. it was asked to be deleted.
from syslog (during upgrade):
```
Jun 25 19:10:44 juju-ed722c-mojo-14 systemd[1]: Stopping Openstack Neutron Open
vSwitch Plugin Agent...
Jun 25 19:10:44 juju-ed722c-mojo-14 ovsdb-client:
ovs|00001|fatal_signal|WARN|terminating with signal 15 (Terminated)
Jun 25 19:10:46 juju-ed722c-mojo-14 systemd[1]: Stopped Openstack Neutron Open
vSwitch Plugin Agent.
Jun 25 19:10:46 juju-ed722c-mojo-14 systemd[1]: Stopped OpenStack Neutron OVS
cleanup.
Jun 25 19:10:46 juju-ed722c-mojo-14 systemd[1]: Stopping OpenStack Neutron OVS
cleanup...
Jun 25 19:10:46 juju-ed722c-mojo-14 systemd[1]: Starting OpenStack Neutron OVS
cleanup...
Jun 25 19:10:48 juju-ed722c-mojo-14 kernel: [ 6499.589055] device
tap03282320-fb left promiscuous mode
Jun 25 19:10:48 juju-ed722c-mojo-14 kernel: [ 6499.611240] device
tap7e15b3c6-e3 left promiscuous mode
Jun 25 19:10:48 juju-ed722c-mojo-14 kernel: [ 6499.612612] device
tap8e76995d-a6 left promiscuous mode
Jun 25 19:10:48 juju-ed722c-mojo-14 systemd[1]: Started OpenStack Neutron OVS
cleanup.
Jun 25 19:10:48 juju-ed722c-mojo-14 systemd[1]: Starting Openstack Neutron Open
vSwitch Plugin Agent...
Jun 25 19:10:48 juju-ed722c-mojo-14 systemd[1]: Started Openstack Neutron Open
vSwitch Plugin Agent.
Jun 25 19:10:48 juju-ed722c-mojo-14 systemd[1]: Reloading.
Jun 25 19:10:48 juju-ed722c-mojo-14 systemd[1]: Stopping Openstack Neutron Open
vSwitch Plugin Agent...
Jun 25 19:10:48 juju-ed722c-mojo-14 systemd[1]: Stopped Openstack Neutron Open
vSwitch Plugin Agent.
Jun 25 19:10:48 juju-ed722c-mojo-14 systemd[1]: Stopped OpenStack Neutron OVS
cleanup.
Jun 25 19:10:48 juju-ed722c-mojo-14 systemd[1]: Stopping OpenStack Neutron OVS
cleanup...
Jun 25 19:10:48 juju-ed722c-mojo-14 systemd[1]: Starting OpenStack Neutron OVS
cleanup...
Jun 25 19:10:50 juju-ed722c-mojo-14 systemd[1]: Started OpenStack Neutron OVS
cleanup.
Jun 25 19:10:50 juju-ed722c-mojo-14 systemd[1]: Starting Openstack Neutron Open
vSwitch Plugin Agent...
Jun 25 19:10:50 juju-ed722c-mojo-14 systemd[1]: Started Openstack Neutron Open
vSwitch Plugin Agent.
Jun 25 19:10:51 juju-ed722c-mojo-14 systemd[1]: Reloading.
Jun 25 19:10:51 juju-ed722c-mojo-14 systemd[1]: message repeated 2 times: [
Reloading.]
Jun 25 19:10:51 juju-ed722c-mojo-14 systemd[1]: Stopping OpenStack Neutron
Metering Agent...
```
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https://bugs.launchpad.net/bugs/1885264
Title:
neutron-ovs-cleanup runs on package upgrade
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