I _know_ I saw something about this just recently, but can't find it.

I've just loaded the Jan08 sparc snapshot on a sparc2 as a step
towards tracking -current again. 

The new version supports st, but when I try:

	mount -t cd9660 -o ro /dev/cd0a /mnt

I get:

cd9660:	operation not supported by device:

Hmmm, I was just going to grab the dmesg output and noticed that the
machine had dropped into db>

trace says a lot but it doesn't look useful.
ps shows:
db> ps
  pid proc     addr     uid  ppid  pgrp  flag stat em  comm         wchan
  266 f85d6800 f971d000 350   265   264  004086  3  0  more   ttyin f8584500
  265 f865bb00 f9719000 350   264   264  004086  3  0  sh   wait f865bb00
  264 f8613e00 f9711000 350   165   264  004086  3  0  man   wait f8613e00
  263 f8579500 f971b000   0   145   261  006006  3  0  dd   scsi_scsi_cmd f8546
b00
  165 f8596a00 f9715000 350   164   165  004086  3  0  ksh   pause f9715220
  164 f8590500 f9713000   0   100   100  004084  3  0  rlogind   select f80d422
0
  145 f865b800 f970d000   0   115   145  004086  3  0  ksh   pause f970d220
  115 f8637000 f96ff000 350   114   115  004086  3  0  ksh   pause f96ff220
  114 f8573800 f96f1000   0   100   100  004084  3  0  rlogind   select f80d422
0
  113 f8573f00 f96ef000   0     1   113  004086  3  0  getty   ttyin f80d3d90
  100 f85f7900 f970f000   0     1   100  000084  3  0  inetd   select f80d4220
   97 f8622100 f970b000   0     1    97  000084  3  0  sendmail   netcon f86132
22
   93 f85f7300 f9709000   0     1    93  000084  3  0  lpd   select f80d4220
   89 f85f7e00 f9707000   0     1    89  000084  3  0  routed   select f80d4220

   85 f85ee300 f9705000   0     1    85  000004  3  0  cron   biowait f8b46f38
   83 f85d6d00 f9703000   0     1    83  000084  3  0  update   pause f9703220
   69 f85cbf00 f9701000   0     1    69  000084  3  0  timed   select f80d4220
   66 f8595800 f96f5000   0     1    66  000004  3  0  syslogd   biowait f8b476
a8
   60 f8595f00 f96fd000   0     1    54  000084  3  0  nfsiod   nfsidl f80d3c34

   59 f8595100 f96fb000   0     1    54  000084  3  0  nfsiod   nfsidl f80d3c30

   57 f8591c00 f96f9000   0     1    54  000084  3  0  nfsiod   nfsidl f80d3c2c

   56 f857a700 f96f7000   0     1    54  000084  3  0  nfsiod   nfsidl f80d3c28

   49 f858b200 f96f3000   0     1    49  000084  3  0  portmap   select f80d422
0
    2 f8557700 f96ed000   0     0     0  000204  3  0  pagedaemon   thrd_sleep f
80d9658
    1 f8557a00 f96eb000   0     0     1  004084  3  0  init   wait f8557a00
    0 f80e1118 f80c3fe0   0    -1     0  000204  3  0  swapper   scheduler f80e
1118
db> 

That dd command should have finished ages ago.  The drive was nice and
quiet and I'd removed the tape....

I'll leave the machine as it is, incase someone can suggest something
useful to do at this point :-)

--sjg