9.1-STABLE amd64 - Mounting from zfs:zroot failed with error 6

[Piotr Kubaj]

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Having upgraded from r246246 to r247150 I can't boot anymore my
FreeBSD installation (ZFS on root). It's clearly a kernel issue, since
booting the old kernel from r246246 it boots and mounts (with userland
from r247150). A while ago there was a similar problem on the list (
http://lists.freebsd.org/pipermail/freebsd-stable/2013-February/072398.html
), however the error was different. I followed the instructions in
http://lists.freebsd.org/pipermail/freebsd-stable/2013-February/072406.html
but it didn't help.
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