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umount lvm snapshot panic

hi, 
I met a problem with 2.4.9+xfs-08-26+lvm. 
I used following steps:
   1.xfs_freeze -f /mnt/xfs
   2.lvcreate -L 100M -s -n s1 /dev/lvm/lv1 
   3.xfs_freeze -u /mnt/xfs
   4.mount -o ro, nouuid -t xfs /dev/lvm/s1 /mnt/xfs_snap
   5.umount /mnt/xfs_snap
then kernel panic. 
has anyone met the same problem before? 

thx.

Jun