This was well into the transition from single- to multi-user mode,
so the following information is a re-creation after I rebooted to
single-user mode (verbosely), ran "fsck -p", then "exit" -- copy/pasted
from serial console:

# exit
Setting hostuuid: 80f1e964-dc63-0010-89d5-0030482d326a.
Setting hostid: 0xc74551dd.
Fast boot: skipping disk checks.
Mounting local filesystems:.
ELF ldconfig path: /lib /usr/lib /usr/lib/compat /usr/local/lib 
/usr/local/lib/compat /usr/local/lib/perl5/5.24/mach/CORE
32-bit compatibility ldconfig path: /usr/lib32 /usr/lib32/compat 
/usr/local/libre0: link state changed to DOWN
Setting hostname:
Setting up harvesting: 
Feeding entropy: .
Starting Network: lo0 re0.
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        inet6 ::1 prefixlen 128 
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 
        inet netmask 0xff000000 
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        groups: lo 
re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 98:90:96:d6:c9:6d
        inet netmask 0xffffff00 

broadcast 172.16Fat.8.255 
        nd6 opal ttions=29<PERFORMrapNUD,IFDISABLED,A 12UTO_LINKLOCAL>
: pa    media: Ethernetge f autoselect (nonaue)
        status: no lt carrier
Startinwhilg devd.
add hose it gatn keway lo0 fib 0: erneroute already inl mo table
add net de
default: gatewaycpuid = 6; a
addpic host ::1: gatew iday lo0 fib 0: ro = ute already in t06
add net fefaul80::: gateway ::t 1
add net ff02:vir:: gateway ::1
tuaadd net ::ffff:0l ad.0.0.0: gateway dre::1
add net ::0ss   .0.0.0: gateway = 0x::1
Creating anffffd/or trimming lo80403037b7a8
fault g files.
Starticode              = supervisor read data, page not present
ing syslogd.
Stanstruction pointer   = 0x20:0xffffffff80ead57a
rting rpcbind.
stack pointer           = 0x28:0xfffffe085de368c0
fraNFS access cacheme  time=60
rpc.umpointall: grundoon:nte MOUNTPROG: RPC:r     Unknown host
r    pc.umntall: grun   doon: MOUNTPROG:= 0 RPC: Unknown hox28st
No core dump:0xs found.
Settinffffg NIS domain:
Starti85dng ypbind.
Cleae36ring /tmp (X rel900ated).
NFSv4 codis disabled
Stae srting nfsd.
Staegmrting statd.
Stentarting lockd.
R               =ecovering vi edi bastor sessions:.
e 0Starting lpd.
Ux0, pdating motd:.
limiMounting late fit 0lesystems:.
Staxffrting ntpd.
Staffrting powerd.
ype ttarting rsyncd.
                        = DPL 0, pres 1, long 1, def32 0, gran 1
pConfiguring vt:ro blanktimecessor eflags       = interrupt enabled, r.
esume, IOPL = 0
current process         = 567 (ntpd)
[ thread pid 567 tid 100201 ]
Stopped at      pmap_kextract+0x8a:     movq    (%rax,%rcx,1),%r13
db> bt
Tracing pid 567 tid 100201 td 0xfffff80010349a00
pmap_kextract() at pmap_kextract+0x8a/frame 0xfffffe085de36900
free() at free+0x5e/frame 0xfffffe085de36940
kern_close() at kern_close+0xd0/frame 0xfffffe085de369a0
amd64_syscall() at amd64_syscall+0x2db/frame 0xfffffe085de36ab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe085de36ab0
--- syscall (6, FreeBSD ELF64, sys_close), rip = 0x8013ebf2a, rsp = 
0x7fffffffe7d8, rbp = 0x7fffffffe7f0 ---
db> dump
Dumping 1299 out of 32687 MB:..2%..12%..21%..31%..41%..51%..61%..71%..81%..92%
Dump complete

I can afford to leave this system in this state until this evening (local
time here is just after 05:00 as I type), so if there's something I can
poke to get more useful information, please let me know.

Once I reboot (either from yesterday's (r305058) kernel or from the
stable/11 or stable/10 slice), I should be able to make the dump
available via my Web server.

I'm about to build head@r305116 on my laptop (as well); I plan to
follow up to indicate whether it exhibits similar behavior (or not).

David H. Wolfskill                    
Those who would murder in the name of God or prophet are blasphemous cowards.

See for my public key.

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