zroot won't mount after 9.0-RC2 -> 9.0-RELEASE upgrade

[Daniel Staal]

--As of February 15, 2012 2:31:10 AM +0200, Daniel Shahaf is alleged to 
have said:

> One of our amd64 servers runs 9.0-RC2 (releng/9.0 at r228325) with a zfs
> root.
>
> It fails to boot the 9.0-RELEASE (releng/9.0 at r229305) GENERIC kernel
> (self compiled) with a mountfrom error:
>
>     http://people.apache.org/~danielsh/infra/loki-20120215-mountfrom.png
>     mountfrom> zfs:zroot
>     Trying to mount root from zfs:zroot []...
>     Mounting from zfs:zroot failed with error 2.
>
> We've tried to upgrade the zpool format 15->28; the symptoms are
> unchanged.  (The zroot fs is at version 4.)
>
> Why does 9.0-RC2 boot while 9.0-RELEASE (as /boot/testkernel) doesn't?
> What can do to boot 9.0-RELEASE from our zfs root filesystem?

--As for the rest, it is mine.

Did you update the bootloader?  Depending on when you installed the system, 
it's possible your upgrading the zpool means the bootloader can't read it.

Daniel T. Staal

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