kern/41912: Kernel panic when adding and activating a link-layer (MAC) address if interface is not down.

[c81187%gmail.com@localhost]

>Number:         41912
>Category:       kern
>Synopsis:       Kernel panic when adding and activating a link-layer (MAC) 
>address if interface is not down.
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 21 03:40:00 +0000 2009
>Originator:     Charlie
>Release:        5.0.1
>Organization:
N/A
>Environment:
NetBSD blah.wootnet.int 5.0 NetBSD 5.0 (GENERIC) #0: Sun Apr 26 18:50:08 UTC 
2009 
builds%b6.netbsd.org@localhost:/home/builds/ab/netbsd-5-0-RELEASE/i386/200904260229Z-obj/home/builds/ab/netbsd-5-0-RELEASE/src/sys/arch/i386/compile/GENERIC
 i386
>Description:
When adding a MAC address to an interface it will kernel panic unless that 
interface was first marked down.

i.e.
ifconfig ne2 link 00:00:00:00:00:00 active
>> Kernel panic

ifconfig ne2 down && ifconfig ne2 link 00:00:00:00:00:00 active
>> Works
>How-To-Repeat:
Add MAC address to interface marked as up.
>Fix: