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Date: Fri, 15 May 2009 13:10:39 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Andriy Gapon <avg@icyb.net.ua>
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Cc: freebsd-fs@freebsd.org, Pawel Jakub Dawidek <pjd@freebsd.org>
Subject: Re: stable/7: shutdown stuck in zfs_umount (z_op_cnt > 0)
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Andriy Gapon wrote:
> Quite frequently when rebooting or shutting down after long uptime my amd64
> stable/7 system gets stuck in shutdown after printing "All buffers synced".
> Below is some kgdb examination after breaking to ddb and inducing panic.
> I also see lots of threads with zfs-related names (also below).
> Any ideas/suggestions on cause/fix/workaround?
> Thanks!

Just "me too" with amd64 7-STABLE (pre 7.2-RELEASE) and onetime with 
7.2-RC1 i386 in Qemu session (also with ZFS mounted filesystem)

Miroslav Lachman