[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

Konstantin Belousov <kib at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib at FreeBSD.org

--- Comment #53 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Glen Barber from comment #52)
It is physically impossible to hang on a line which is not loop.

I suspect that it is either the buffer flush code, or softdep worker thread
which loop and cause shutdown thread to wait.  It is good that you have
reproducable case and willing to move it further, previous reporters only
bother to whine.

See
https://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
for the instructions on how to configure your kernel and what information to
get.

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