lsof and zfs: "No physical znode address"

I have a FreeBSD 8.2 system running ZFS and a MySQL 5.5 database. I installed lsof from ports. When I run lsof, it says
Code:
No physical znode address
Can someone explain what this message means?

Code:
mysqld   1234 mysql *273u                         No physical znode address: 0xffffff01fe261000
mysqld   1234 mysql *274u                         No physical znode address: 0xffffff01fe3d7000
mysqld   1234 mysql *275u                         No physical znode address: 0xffffff01fe2c8160

I don't think it is serious, but I can't tell if this is an issue with the lsof port or with zfs itself.
 
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