[Bug 234042] panics on 12.0-RELEASE: swi4: clock(0), instruction pointer 0x0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234042

--- Comment #9 from Mike Andrews <mandrews at bit0.com> ---
All of my systems are dual-stack v4/v6, and the panics happen after a few days
of uptime.  Not boot-time.  If it was boot-time I wouldn't have finished
upgrading the whole rack. :)

There shouldn't be any churn in the ARP and ND tables -- it's a server rack and
most addresses are statically assigned, and nothing's coming or going.  The
expire times are at defaults.  So the only churn should be re-populating right
after a normal expire.  Traffic does get kinda heavy at times though (lots of
HTTPS, lots of NFSv3) though we had a lightly loaded system get it yesterday.

All the NICs are em(4) -- we have a few systems with igb but none of those have
had the panic yet.  No idea if that's relevant or just luck.

I put 12.0-p2 on everything overnight last night and one system has paniced
since then, so it's not anything that was fixed in that patch.  The panics did
not happen on 11.x or 10.x -- this is all new with 12.0.

I do now have vmcore images now for many of these, including the 12.0-p2 one
from two hours ago.  (Initially I didn't have dumps working on geli+gmirrored
swap.  I do now.)

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