Reproducable panic with multicast on VLAN interface

[Frank Volf]

Hi,

I have a problem with FreeBSD-4.8-STABLE in which the system panics when
multicast definitions are being removed from an interface. The later is very 
easily reproduced by killing zebra.

This is a rather serious problem because it makes FreeBSD unusable as a VLAN
router in a data center.

I filed a PR for this including the traceback (kern/54314), but on examination
of the gnats database I found that this problem was also reported in 
(kern/40723) with a more accurate problem description than mine.

I would like to resolve this issue but I do not know how to proceed: can
someone help me with this and do they need more info to do so? Or is there
are detailed description of this part of the kernel available, so I can look
for the bug myself?

Thanks for any advice.

Frank