kern/138666: [multicast] [panic] not working multicast through igmpproxy

[Bruce Simpson]

Andriy Syrovenko wrote:
> Is it planned to be MFCed to STABLE?
> Or, could you possibly point me into the right revision in HEAD, so I
> could merge and test it locally?
>   
Actually I did already MFC most of my changes to stable/8, just not 
releng/8.0.

There were a few things to do with IGMP packet checks which I rolled in 
to my last swathe of changes. If this is a purely IGMP related problem, 
those fixes should be enough to get going.

On the other hand, you could try backing out the last few revs on 
ip_mroute.c where I've tried to clean up some of the legacy code and get 
it into modernity.

I didn't turn up any problems with that code in my most recent testing 
(last March, when I committed them), but my testing was limited to my 
own LAN.

The backtrace in the PR suggested a problem around m_freem(), this could 
be a problem with another call which uses the mbuf.