boot failure at ZFS: unsupported feature: com.delphix:hole_birth

[乔楚]

Today ,I upgrade to
http://svnweb.freebsd.org/base?view=revision&revision=260157

After svn up, make clean, make buildworld, make buildkernel, make
installkernel, reboot, mergemaster -p, make installworld, mergemaster,
reboot, OS can't boot.

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.