Comment 7 for bug 1655567

When creating a subnet with flag dhcpv6-stateless, both the server (at https://github.com/openstack/neutron/blob/master/neutron/db/ipam_pluggable_backend.py#L449) and the DHCP linux driver (at https://github.com/openstack/neutron/blob/master/neutron/agent/linux/dhcp.py#L1222) attempt to assign an IP address to the DHCP port and that may trigger this bug.

Based on this, the action plan discussed today during L3 sub-team meeting is:

1) Confirm in Kibana, with other occurrences of this bug, the cause of this bug
2) If confirmed, we are going to refine this query to exclude DHCP ports: https://github.com/openstack/neutron/blob/master/neutron/db/ipam_pluggable_backend.py#L461. With this, only the DHCP linux driver will assign IP address to a DHCP port on a dhcpv6-stateless subnet