i386 hangs during halt "vnodes remaining... 0 time out"

[Tijl Coosemans]

On Sat, 21 Apr 2018 21:09:09 +0000 Rick Macklem <rmacklem at uoguelph.ca> wrote:
> With a recent head/current kernel (doesn't happen when running a Dec.
> 2017 one), when I do a halt, it gets as far as:
> 
> vnodes remaining... 0 time out
> 
> and that's it (the time out appears several seconds after the first "0").
> With a Dec. 2017 kernel there would be several "0"s printed.
> It appears that it is stuck in the first iteration of the sched_sync()
> loop after it is no longer in SYNCER_RUNNING state.
> 
> Any ideas? rick

See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227404
I have a patch (attached) but haven't been able to test it yet.
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