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

[Kevin Lo]

This issue is easily reproduced on 9.0 -CURRENT as well.
I got kernel panic after running mrouted, igmpproxy, or xorp.

	Kevin 

Andriy Syrovenko wrote:
> Hi!
> 
> Yes, I have PF enabled with some NAT rules present in the rule set. However
> disabling PF (even by commenting out 'pf_enable' in the /etc/rc.conf and
> rebooting the machine) does not make any difference. The problem persist
> regardless of whether NAT is enabled or not (or even whether pf.ko is loaded
> or not).
> 
> Best regards,
> Andriy.
> 
> 2010/12/15 serg vasilyev <sergv326 at gmail.com>
> 
> > 2009/12/9, Andriy Syrovenko <andriys at gmail.com>:
> > > Hi,
> > >
> > > Well, turning off the transmit checksum offloading on the upstream
> > > interface solves the problem with IP checksums of IGMP report and
> > > leave messages always being 0. So after issuing the
> > >
> > > ifconfig re1 -txcsum
> > >
> > > command, the proxy successfully subscribes to receiving multicast
> > > streams, and I can see multicast UDP traffic coming in on the upstream
> > > interface. However there is another serious problem. Shortly alfter my
> > > router starts forwarding multicast traffic kernel crashes. The crash
> > > may happen either immediately when I press the play button in my IPTV
> > > player, or just after several channel switches. You can find crash
> > > reports in the attached files. They are almost identical, differing
> > > only in whether the pf module is loaded.
> > >
> > >
> > > The interesting part of the story is if I block incoming UDP multicast
> > > traffic using something like
> > >
> > > block in quick inet proto udp from any to 224.0.0.0/4
> > >
> > > in my pf.conf, system remains stable. But as soon as I comment the
> > > rule and reload pf, kernel crashes. I suspect the problem is not
> > > strictly related to the igmp processing, but to the multicast routing
> > > in general. Probably something wrong with thread synchronization. My
> > > system is a dual-core Intel Atom.
> > >
> > > Another interesting observation is when my BSD box is disconnected
> > > from the upstream router, I can see only IGMPv3 messages going out the
> > > upstream interface, even despite the fact that igmpproxy supports
> > > IGMPv2 only.
> > >
> > > br,
> > > Andrey
> > >
> > Does your system do any nat processing ?
> >
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