See URL for full details. "Any user who has been granted permissions to access a SCSI tape device can send some commands, which may cause it to become unusable for other users." Fix: http://linux.bkbits.net:8080/linux-2.6/cset@42373cf23YEvgue3d3UyXV1OR0aIWA
fixed in cvs
FEDORA-2005-392