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Subject: [Bug 193758] either gptzfsboot or zfsloader hangs during boot after
 kernel and pool upgrade
Date: Wed, 29 Oct 2014 21:24:40 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193758

Andrey V. Elsukov <ae@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ae@FreeBSD.org

--- Comment #6 from Andrey V. Elsukov <ae@FreeBSD.org> ---
(In reply to mark from comment #2)
> chance to try that, but as far as I can tell the only difference in zfsboot
> between 8.4 and 9.2 were a couple of lines relating to serial console
> handling, suggesting like the forum comment that gptzfsboot is hanging in
> some serial console related code.

The difference between 8.x and 9.x+ is very big.
9.x includes this commit and many other fixes
https://svnweb.freebsd.org/base?view=revision&revision=243243

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