[Bug 271759] if_ure(4) panic: unaligned access

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271759

--- Comment #36 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #35)

Other testing with an official snapshot build (so: debug build)
indicates that the failures tied to in6ifa_ifwithaddr involve:

Kernel page fault with the following non-sleepable locks held:
shared rm in6_ifaddr_lock (in6_ifaddr_lock) r = 0 (0xc0b5acd0) locked @
/usr/src/sys/netinet6/in6.c:1620
stack backtrace:
#0 0xc035e060 at witness_debugger+0x74
#1 0xc035f2ec at witness_warn+0x41c
#2 0xc0610b58 at abort_handler+0x1d8
#3 0xc05ef6ac at exception_exit+0
#4 0xc04986b4 at in6ifa_ifwithaddr+0x40
#5 0xc04aa060 at ip6_input+0xd38
#6 0xc04235bc at netisr_dispatch_src+0x100
#7 0xc041a384 at ether_demux+0x1bc
#8 0xc041bb68 at ether_nh_input+0x3dc
#9 0xc04235bc at netisr_dispatch_src+0x100
#10 0xc041a808 at ether_input+0xec
#11 0xe183810c at $a.10+0xbc
#12 0xc03504dc at taskqueue_run_locked+0xb8
#13 0xc0351560 at taskqueue_thread_loop+0x108
#14 0xc02a384c at fork_exit+0xa0
#15 0xc05ef640 at swi_exit+0
Fatal kernel mode data abort: 'Alignment Fault' on read

I've submitted https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272966
for this.

I've also submitted https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272965
for a different backtrace structure that various tests produce that also
include: 'Alignment Fault' on read

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