https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195458

--- Comment #46 from Glen Barber <g...@freebsd.org> ---
(In reply to rkoberman from comment #45)
> I have succeeded in working around the issue by:
> # shutdown now
> # sync
> wait a minute
> # reboot
> 
> Since I started doing this I have not had my system hang. Note that
> "shutdown now" followed by a reboot is functionally identical to "shutdown
> -r now" except for the very long delay between termination of multi-user
> services the actual reboot. I am guessing that something is flushing. I
> really doubt the "sync" is required, but I do it just to be sure.
> 
> I have no explanation as to why this seems to work, but it has for the three
> updates I have used it on. I can only hope that this gives someone a clue as
> to what the actual issue is.

This is somewhat the direction I was going when asking for the service(8) and
sysctl(8) output.  I've finally reproduced the issue in VirtualBox, so now that
I can reproduce it reliably, and with your findings, hope to be able to
identify the underlying cause soon.

Thank you for providing this information.

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