I found one of my amd64 systems running -current, built on 12th of
August, has crashed as follows.
I am not sure if this is still relevant; please excuse the noise if
this has already been found and fixed.
kernel: protection fault trap, code=0
Stopped at rt_ifa_del+0x39: movb 0x1be(%rax),%bl
ddb{2}> bt
rt_ifa_del(ffff8000004e9400,800100,deaf0009deafbead,0) at rt_ifa_del+0x39
in6_unlink_ifa(ffff8000004e9400,ffff8000000da2a8) at in6_unlink_ifa+0xae
in6_purgeaddr(ffff8000004e9400) at in6_purgeaddr+0x127
nd6_expire(0) at nd6_expire+0x96
taskq_thread(ffff80000002c080) at taskq_thread+0x100
end trace frame: 0x0, count: -5
