I found one of the issues which cause such error described in this bug report. It is now reported in separate bug report: https://bugs.launchpad.net/neutron/+bug/1819160
But it's not the only issue which cause failures in the way reported in this report. Sometimes it may happen that some HA router (nonDVR) tests are failing and that still needs to be investigated here.
I found one of the issues which cause such error described in this bug report. /bugs.launchpad .net/neutron/ +bug/1819160
It is now reported in separate bug report: https:/
But it's not the only issue which cause failures in the way reported in this report. Sometimes it may happen that some HA router (nonDVR) tests are failing and that still needs to be investigated here.