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

[bugzilla-noreply at freebsd.org]

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

--- Comment #31 from ncrogers at gmail.com ---
+1 for this breaking upgrading to 10.1-RELEASE-p6 from p5. Not being able to
update to the latest patch level without having to physically reboot a
production server when it hangs during reboot really sucks...

In my opinion based on testing, the problem seems more to do with having UFS
soft updates journaling enabled, possibly coupled with replacing /sbin/init.
Temporarily disabling soft updates journaling somewhat alleviates the problem
for me when going from 9.x to 10.1 (the hang stops, but the file system comes
back dirty). However it is not a tractable solution when going from one 10.1
patch level to the next (e.g., 10.1-RELEASE-p5 to p6). It would be really nice
to get some sort of resolution to this bug.

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