Detection of interface type by filter must happen before detection of interface type by prefix. Else the following sequence of commands will try to create a LAGG interface instead of a VLAN interface, which accidentially worked previously, because the date pointed to by the ifr_data pointer was not parsed for VLAN's. This is a regression after r366917 (adding MT_FILTER) and r368229 (VLAN creation now parses the ifr_data field).
ifconfig lagg0 create
ifconfig lagg0.256 create
MFC after: 3 days
Sponsored by: Mellanox Technologies // NVIDIA Networking