Comment 6 for bug 1747709

So I checked this error message from OVS agent log on one example port "4b30e9f2-7e1a-4c1d-bfd7-93782de93e58". It looks that this error message appears after deletion of port. In neutron-server log port "4b30e9f2-7e1a-4c1d-bfd7-93782de93e58" was deleted at 15:58:18 - http://logs.openstack.org/57/542257/1/check/neutron-tempest-ovsfw/2734c62/logs/screen-q-svc.txt.gz#_Feb_08_15_58_18_368247
Just after that port was deleted on L2 agent's side: http://logs.openstack.org/57/542257/1/check/neutron-tempest-ovsfw/2734c62/logs/screen-q-agt.txt.gz?#_Feb_08_15_58_19_229898 and few milliseconds later there was this error message: http://logs.openstack.org/57/542257/1/check/neutron-tempest-ovsfw/2734c62/logs/screen-q-agt.txt.gz?#_Feb_08_15_58_19_711544

So this is not so big problem IMHO but it requires more detailed check still