This might be due to a recent DHCP change that can sometimes cause the agent to not start correctly on an agent upgrade, which happens in the grenade job.
I re-opened the original bug and have a change up for review:
https://bugs.launchpad.net/neutron/+bug/1627902
https://review.openstack.org/#/c/406428/
Once that fix merges we should recheck to verify.
This might be due to a recent DHCP change that can sometimes cause the agent to not start correctly on an agent upgrade, which happens in the grenade job.
I re-opened the original bug and have a change up for review:
https:/ /bugs.launchpad .net/neutron/ +bug/1627902
https:/ /review. openstack. org/#/c/ 406428/
Once that fix merges we should recheck to verify.