[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

Andrew Smith <iamasmith.home at gmail.com> changed:

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                 CC|                            |iamasmith.home at gmail.com

--- Comment #10 from Andrew Smith <iamasmith.home at gmail.com> ---
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).

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