[Bug 272965] armv7 'Alignment Fault' on read panic during udp_input for kyua's sys/netinet6/exthdr:exthdr ; other udp_input related panics

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272965

--- Comment #6 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Michal Meloun from comment #4)

Just information from my explorations with my debug build, no
patching from your patches. I expect this points at bugzilla
272966 not being a duplicate of this one. Effectively it looks
like my builds do not test this "during udp_input" bugzilla.

Most of the tests that got panics during udp_input for the
snapshot get no panic at all with my build.

The ones where "v6" or "netinet6" was involved generally
instead get the kind of panic backtrace that bugzilla 272966
reported, including it being during in6ifa_ifwithaddr instead
of during udp_input.

/usr/bin/kyua test -k /usr/tests/Kyuafile sys/netpfil/pf/get_state:many
produced a new backtrace showing a panic during
tcp_input_with_port(). (I may end up with a new bugzilla
for this.)

I plan on submitting my notes in the bugzilla that was reporting
the same type of backtrace that I see in my testing. Anything
else would just be too confusing about what the evidence was
like. Unless panics reappear during udp_input, I consider this
bugzilla as basically untested in my future testing of your
patches.

I still have exploring to do with my build for what, in the
snapshot testing, had panics during in6ifa_ifwithaddr.

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