[panic] zfs_zget() panic during 'svn update'

Hi,

I'm running -CURRENT from a few weeks ago (r234559M), and during 'svn
update', had the machine panic.

I have kgdb output available here, and am happy to provide additional
information if needed:

    http://people.freebsd.org/~gjb/zfs_zget-panic.kgdb.txt

Regards,

Glen