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Date: Thu, 12 Mar 2009 13:42:19 +0000
From: Bruce Simpson <bms@incunabulum.net>
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To: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com>
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Cc: freebsd-current@freebsd.org
Subject: Re: IGMPv3 hot interface detach panics?
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Thomas Sparrevohn wrote:
> ...
> I am getting a panic as well - but I am not sure its related
>
>   

Looks like inm is NULL at line 1706 in igmp.c

Can you confirm this by inspecting the core dump? i.e.
frame 9
print inm

gcc has inlined the functions at this point. It may be a symptom of a race.
Can you reproduce what the system was doing at the time?

thanks,
BMS