ZFS on 7.X CURRENT /usr refuses to remount after boot

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3 msg	kernel panic during reboot

ZFS on 7.X CURRENT /usr refuses to remount afte...
\ Outback Dingo (24 Jun 2007)
. \ Thierry Herbelot (24 Jun 2007)
. . \ Outback Dingo (24 Jun 2007)
. \ Axel S. Gruner (24 Jun 2007)

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Subject:	ZFS on 7.X CURRENT /usr refuses to remount after boot
Group:	Freebsd-current
From:	Outback Dingo
Date:	24 Jun 2007

ok, configs first
#cat /boot/loader.conf
acpi_ibm_load="YES" # IBM z60m Laptop
if_iwi_load="YES" # Intel wireless driver on IBM z60M
legal.intel_iwi.license_ack=1 # Intel binary agreement
snd_hda_load="YES" # Intel High Definition Audio Driver
zfs_load="YES" # load ZFS
vfs.zfs.zil_disable="1" # x86 recommended config -
http://wiki.freebsd.org/ZFSTuningGuide
vfs.zfs.prefetch_disable="1" # x86 recommended config -
http://wiki.freebsd.org/ZFSTuningGuide
vfs.zfs.arc_max="83886080" # x86 recommended config -
http://wiki.freebsd.org/ZFSTuningGuide
vm.kmem_size_max="268435456" # x86 recommended config -
http://wiki.freebsd.org/ZFSTuningGuide

cat /etc/sysctl.conf
# $FreeBSD: src/etc/sysctl.conf,v 1.8 2003/03/13 18:43:50 mux Exp $
#
# This file is read when going to multi-user and its contents piped thru
# ``sysctl'' to adjust kernel values. ``man 5 sysctl.conf'' for details.
#
kern.maxvnodes=50000

cat /etc/rc.conf
# -- sysinstall generated deltas -- # Sat Jun 9 00:06:41 2007
# Created: Sat Jun 9 00:06:41 2007
# Enable network daemons for user convenience.
hostname="z60m.somedomain.com"
ifconfig_iwi0="DHCP"
moused_enable="YES"
moused_port="/dev/psm0"
moused_type="auto"
ntpdate_enable="YES"
ntpdate_flags="europe.pool.ntp.org"
sshd_enable="YES"
zfs_enable="YES"

cat /etc/rc.d/zfs
#!/bin/sh
#
# $FreeBSD: src/etc/rc.d/zfs,v 1.5 2007/04/22 20:55:08 pjd Exp $

now... as seen straight from the docs at
http://wiki.freebsd.org/ZFSQuickStartGuide

# echo 'zfs_enable="YES"' >> /etc/rc.conf

# zpool create tank raidz da0 da1 da2

# zfs create tank/usr
# zfs create tank/usr/home
# zfs create tank/usr/home/user
# zfs create tank/usr/lib
# zfs create tank/usr/libexec
# zfs create tank/usr/libdata
# zfs create tank/usr/bin
# zfs create tank/usr/sbin
# zfs create tank/usr/local
etc etc etc

# cd /usr
# tar zcvpf /tank/usr/usr-fs.tgz *
# cd /tank/usr
# tar zxvpf usr-fs.tgz

cat /etc/fstab

# Device Mountpoint FStype Options Dump Pass#
/dev/ad0s3b none swap sw 0 0
/dev/ad0s3a / ufs rw 1 1
# comment out old
#/dev/ad0s3d /usr ufs rw 2 2
tank /usr zfs rw 2 2
/dev/acd0 /cdrom cd9660 ro,noauto 0 0

# echo 'daily_status_zfs_enable="YES"' >> /etc/periodic.conf
# zfs set mountpoint=/usr tank/usr

upon reboot, the system drops to single user with error message

cannot find fsck_zfs in /bin, /sbin

but from single user i can
zpool import -f tank
zfs mount -a
exit

and itll continue to multi-user mode

what did i miss ???
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