From owner-freebsd-stable@FreeBSD.ORG  Tue Jun 10 14:50:49 2014
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Date: Tue, 10 Jun 2014 08:50:43 -0600
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Subject: Re: FreeBSD-STABLE on May 2014 can not import pool with feature:
 com.delphix:hole_birth
From: Alan Somers <asomers@freebsd.org>
To: Vladislav Prodan <universite@ukr.net>
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On Tue, Jun 10, 2014 at 8:28 AM, Vladislav Prodan <universite@ukr.net> wrote:
>
>
> I tried to boot via MFSbsd 10.0-RELEASE-amd64 special edition.
>
>
> # zpool import -R /mnt/zroot -f zroot
>
> Screen show:
> ZFS: unsupported feature: com.delphix:hole_birth
> gptzfsboot: No ZFS pool located, can't boot.
>
> I'm use root ZFS.
> How to recovery it?
>
>
> Thanks.
>

Sounds like you need to recompile MFSBSD using a more recent kernel.txz.