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

[Andriy Syrovenko]

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 ?
>