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Date: Sun, 1 Oct 1995 17:45:07 +1000
From: mark@seeware.DIALix.oz.au
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Subject: kern/757: kern / removal of CD-ROM -> reboot & single-user mode 
Sender: owner-bugs@freebsd.org
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>Number:         757
>Category:       kern
>Synopsis:       Removal of mounted CD-ROM causes reboot & single user mode
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Oct  1 01:00:02 PDT 1995
>Last-Modified:
>Originator:     Mark Hannon
>Organization:
-
>Release:        FreeBSD 2.0.5-RELEASE
>Environment:


>Description:

For some stupid reason I removed a mounted CD-ROM from my 
soundblaster CD-ROM yesterday afternoon.  This morning when
I came to the machine I discovered that the machine had rebooted 
during the evening and the reboot had failed at the file system mount step.  

This was obviously because no CD-ROM was present in the drive
and /cdrom was listed in my /etc/fstab.  The implication of a
failed mount are of course that the machine is in single-user
mode and allows root access without a password.

I am not 100% certain that the CD-ROM was the cause of failure 
but the last message in /var/log/messages was:
 Oct  1 02:00:05 putte /kernel: matcd0: Not ready while reading block 144
 Oct  1 02:00:05 putte /kernel: matcd0: Media changed - Further I/O aborted until device closed

This leads me to believe that an attempt was made to access the CD-ROM
at 2am and this caused the reboot (my /etc/daily is run at 2am if this
gives any clues).

>How-To-Repeat:

Remove a mounted CD-ROM and wait for disaster

>Fix:

I guess (I haven't tried it) that the following change in
/etc/rc would at least stop root access at reboot.

mount -a -t nonfs,cd9660   
if [ $? != 0 ]; then
        echo "Filesystem mount failed, startup aborted"
	exit 1
fi
mount -a -t cd9660   



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