Panic from ipfw_alloc_rule() after r334769 -> r334832

[David Wolfskill]

Sorry for lack of much analysis; am at BSDCan.  jtl@ suggested that a
sequence of changes involving memory allocation and ipfw counters is
likely to be at issue.

I tried grabbing some screen shots, the last of which has a backtrace
(that isn't cut off, as the middle one is); they are available at
<http://www.catwhisker.org/~david/FreeBSD/head/panic@r334832/>.

Peace,
david
-- 
David H. Wolfskill				david at catwhisker.org
Note that the presence of a pardon implies prior conviction for a crime.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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