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See my question which I believe is the same answer: https://ask.openstack.org/en/question/102330/openstack-subnet-create-causes-linuxbridge-agent-rtnetlink-error-on-newton/

tl;dr: The linux-bridge agent disables IPv6 by design. If you have IPv6 configured on your physical NIC, neutron/root will not have permission to move the address from the physical NIC to the linux-bridge. The solution is to remove the IPv6 configuration from the operating system network config files. Presumably, the linux-bridge will still forward IPv6 as L2 frames and you can still use IPv6 on your guests.

See my question which I believe is the same answer: https://ask.openstack.org/en/question/102330/openstack-subnet-create-causes-linuxbridge-agent-rtnetlink-error-on-newton/

tl;dr: The linux-bridge agent disables IPv6 by design. If you have IPv6 configured on your physical NIC, neutron/root will not have permission to move the address from the physical NIC to the linux-bridge. The solution is to remove the IPv6 configuration from the operating system network config files. Presumably, the linux-bridge will still forward IPv6 as L2 frames and you can still use IPv6 on your guests.

(please upvote if this helped you)