From owner-freebsd-fs@FreeBSD.ORG  Sat May 15 17:50:01 2010
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Date: Sat, 15 May 2010 19:30:24 +0200
From: Pawel Tyll <ptyll@nitronet.pl>
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Subject: Root mount from ZFS takes forever...literally.
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Hi list,

Has this happened to anyone?

Boot process "hangs" on Trying to mount root from zfs:tank/root - I
can import the pool from alternate boot source (PXE), and access files
fine, but I can't finish booting the system from ZFS.

It's a recent 8-STABLE, it happened after upgrading from older
8-STABLE, but reverting to older kernel and modules doesn't solve
this, so maybe it's unrelated.

Cheers.