Bug ID: 227404
           Summary: UP FreeBSD VM always hangs on reboot since
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern

It looks on Hyper-V the issue only happens to UP VM (SMP VM is good), but the
VM hangs in the generic FreeBSD kernel code, so I suspect the issue should
reproduce on bare metal as well.

More info:
FreeBSD-12.0-CURRENT-amd64-20180322-r331345-disc1.iso is good, but
FreeBSD-12.0-CURRENT-amd64-20180329-r331740-disc1.iso is broken.

These are the serial messages:

Tue Apr 10 01:52:02 CST 2018

FreeBSD/amd64 (decui-b11) (ttyu0)

login: Stopping cron.
Stopping sshd.
appending output to nohup.out
Stopping devd.
Writing entropy file:.
Writing early boot entropy file:.
Apr 10 01:52:10 decui-b11 syslogd: exiting on signal 15
Waiting (max 60 seconds) for system process `vnlru' to stop... done
Waiting (max 60 seconds) for system process `bufdaemon' to stop... done
Waiting (max 60 seconds) for system process `syncer' to stop...
Syncing disks, vnodes remaining... 4 NMI ISA 0, EISA ff
NMI/cpu0 ... going to debugger
[ thread pid 18 tid 100055 ]
Stopped at      witness_lock+0x1ae:     popq    %rbp
db> bt
Tracing pid 18 tid 100055 td 0xfffff8000b052000
witness_lock() at witness_lock+0x1ae/frame 0xfffffe0026553930
sched_add() at sched_add+0xe3/frame 0xfffffe0026553970
setrunnable() at setrunnable+0x8f/frame 0xfffffe0026553990
sleepq_broadcast() at sleepq_broadcast+0xe8/frame 0xfffffe00265539d0
wakeup() at wakeup+0x1d/frame 0xfffffe00265539f0
kproc_suspend_check() at kproc_suspend_check+0x58/frame 0xfffffe0026553a20
buf_daemon() at buf_daemon+0x11a/frame 0xfffffe0026553a70
fork_exit() at fork_exit+0x84/frame 0xfffffe0026553ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0026553ab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---

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