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Date: Tue, 10 Feb 1998 10:13:41 -0800 (PST)
From: wefa@unicom.talkline.de
To: freebsd-gnats-submit@FreeBSD.ORG
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Subject: kern/5703: CDROM Media Error triggers complete system lockup
Sender: owner-freebsd-bugs@FreeBSD.ORG
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>Number:         5703
>Category:       kern
>Synopsis:       CDROM Media Error triggers complete system lockup
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Feb 10 10:20:00 PST 1998
>Last-Modified:
>Originator:     Christoph Weber-Fahr
>Organization:
O.tel.o Communicoations
>Release:        2.2.5-RELEAS
>Environment:
FreeBSD hektor.otelo-call.de 2.2.5-RELEASE FreeBSD 2.2.5-RELEASE #0: Thu Jan 29
     22:07:42 CET 1998     root@hektor.otelo-call.de:/usr/src/sys/compile/HEKTOR  i386
>Description:
Plain vanilla '486 System with aha1542, 2 1GB SCSI disks and a 
Toshiba 5201 SCSI CDROM. Trying to cp -R a part of the CDROM to
disk. (Only special is that the cdrom is accessed through a local
nfs (Re-)mount). After some time the CDROM encounters a Media Error:

"cd0(aha0:0:0): MEDIUM ERROR info:0x4a284 asc:15,0 Random positioning error"

After this the system solidly locks, though the kernel seems to 
continue working.
Some data points: 
I can...
- switch consoles
- scroll consoles (with scroll lock)
- open TCP connections to the system
- ping the system
- Even the Console Screen saver appears after some 
  time and disappears after pressing a key.
I can't
- enter any key into a shell on the console.
- log in on console (login doesn't react)
- log in via telnet (no login banner appears)
- deliver mail (no sendmail banner appears)
- ^Z or ^C the running cp process

This state remains - no timeouts occur within 
at least 10 Minutes.


>How-To-Repeat:
See above. Specifically, the problem _is_ repeatable here.
>Fix:

>Audit-Trail:
>Unformatted:

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