[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

--- Comment #50 from Glen Barber <gjb at FreeBSD.org> ---
(In reply to Andrew Smith from comment #10)
> It seems that this at last effects all Kernels since 10.1-RELEASE through p3.
> 
> If you have one of these Kernels with Softupdates active on the root
> filesystem and you replace /sbin/init then you get this behaviour.
> 
> If you either disable file system softupdates on the filesystem or you
> disable the softupdates option in a new Kernel build then the issue does not
> exist.
> 
> I suspect people that haven't had this issue have some other environmental
> difference that nobody has highlighted yet.
> 
> The issue of course hits 10.0-RELEASE to 10.1-RELEASE upgrades since when
> freebsd-update install is run, the first thing done is to replace the Kernel
> and ask for a reboot then run freebsd-update again. The Kernel exhibiting
> the problem is then in place.
> 
> Could this be related to the changes made to ufs for the per FFS-Filesystem
> threading around August? (r269457, r269533, r269583).

I built and installed GENERIC with these commit reverted (releng/10.1 at r270157),
and still see this behavior after freebsd-update(8) installs the userland
updates, so I'm inclined to think these are not the cause.

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