duplicate vlan panic

[Ilya Orehov]

Hi!

RELENG_7 from October,9 ( em card )
Also repeatable on another box with RELENG_7 from last Saturday. ( xl and nfe )

Boot single user or remount readonly.

ifconfig vlan1 create vlan 1 vlandev xl0
ifconfig vlan2 create vlan 1 vlandev xl0

instant panic. 

Call stack snapshot captured as jpeg, I can send it to interested person.

On 6.2-STABLE : both vlans created, no errors printed.
On -current from Sep,21 "ifconfig: SIOCIFCREATE2: File exists",
only first vlan created.

best regards,
Ilya Orehov.