[Bug 195458] Hang on shutdown/root unmount after FreeBSD 10.1R upgrade

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

rkoberman at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |rkoberman at gmail.com

--- Comment #45 from rkoberman at gmail.com ---
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.

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