[Bug 227404] UP FreeBSD VM always hangs on reboot since 20180329-r331740

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227404

--- Comment #3 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to Dexuan Cui from comment #0)
I have observed a similar (perhaps the same issue) on real multi-core hardware
but with the SMP kernel (GENERIC) when all APs were disabled via hints
(hint.lapic.%d.disabled=1).

The reboot got stuck and a thread doing it was in this state:
db> bt
Tracing pid 1 tid 100002 td 0xfffff80003230560
sched_switch() at sched_switch+0x95c/frame 0xfffffe00213b9880
mi_switch() at mi_switch+0x188/frame 0xfffffe00213b98b0
sleepq_switch() at sleepq_switch+0x10d/frame 0xfffffe00213b98f0
sleepq_timedwait() at sleepq_timedwait+0x50/frame 0xfffffe00213b9930
_sleep() at _sleep+0x2fa/frame 0xfffffe00213b99d0
kproc_suspend() at kproc_suspend+0x9a/frame 0xfffffe00213b9a00
kproc_shutdown() at kproc_shutdown+0x4e/frame 0xfffffe00213b9a20
kern_reboot() at kern_reboot+0x19e/frame 0xfffffe00213b9a60
sys_reboot() at sys_reboot+0x3ab/frame 0xfffffe00213b9ac0
amd64_syscall() at amd64_syscall+0x79b/frame 0xfffffe00213b9bf0
fast_syscall_common() at fast_syscall_common+0x105/frame 0xfffffe00213b9bf0

I didn't examine other threads much.

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