[Bug 243319] Panicked laptop & local network ARP flood

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243319

--- Comment #6 from Conrad Meyer <cem at freebsd.org> ---
These are different requesters?  It would help to spell out which IP(s) are the
panic'd laptop.

07:55:53.025959 ARP, Request who-has 10.6.112.1 tell 10.6.112.16, length 46
07:55:53.025980 ARP, Request who-has 10.6.112.1 tell 10.6.112.18, length 46
                                                              ^^
If you don't have debugnet enabled I don't see any obvious reason debugnet
would be ARPing.  Plus, debugnet isn't *that* spammy and the number of ARPs it
sends is bounded; it gives up after a few tries (like, 3?).  You would see
obvious prints as a side effect of debugnet-enabled dump being attempted after
the panic, and an obvious print when the ARP request failed.

If anything, I suspect this is some NIC internal firmware/hardware behavior due
to the panic'd machine not processing RX queues or something.

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