smbfs panic (present in 5.3-BETA2, 5.3-STABLE)

[Achilleus Mantzios]

This panic is reproducible:

# kldload smbfs
# mount some remote smbfs filesys
# mount the above remote smbfs filesys again
# mount the above remote smbfs filesys again
# umount the above remote smbfs filesys
# umount the above remote smbfs filesys again
# umount the above remote smbfs filesys again
# kldunload smbfs


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-Achilleus