[zfs] Mounting from (...) failed with error 19

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Hi,

With latest kernel I got:

	Mounting from (...) failed with error 19

On boot.  The system is using pure ZFS setup.  It seems that 19 means
ENODEV but according to the dmesg the device do exist.

At the beginning I thought it was because that zpool.cache was destroyed
somehow, so I have tried to use LiveFS and mkdir /boot/zfs, hostid
start, zpool import -f, mount pool/root, and copy /boot/zfs/zpool.cache
over it but unluckily this failed.

Escaping to boot loader prompt, and load old kernel, old opensolaris.ko,
old zfs.ko doesn't work.  However, using LiveFS to restore the whole
kernel back to previous version fixed the problem (mv kernel kernel.bad
&& mv kernel.old kernel).

Looking at the change log, I find that there is no intrusive changes to
ZFS itself but there are some changes against mountroot logic, but I'm
not convinced since loading kernel.old/kernel at boot loader should have
override this :-/

Any idea?

Cheers,
- -- 
Xin LI <delphij_at_delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!	       Live free or die
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