I was doing a "mt /dev/rst0 offline", and an ls hung on the disks
that are concatenated... .

ps output:
422  0.0  0.4   252  140 co  D+    2:04PM    0:01.43 ls -F 93_08 93_09 93_10 93_11 93_12 

Note: the controlling terminal is hung (console), but I can telnet into the
box.  I can't kill -9 or anything.  *sigh*.

reboot time.