Date: Sun, 1 Oct 1995 17:45:07 +1000 From: mark@seeware.DIALix.oz.au To: FreeBSD-gnats-submit@freebsd.org Subject: kern/757: kern / removal of CD-ROM -> reboot & single-user mode Message-ID: <199510010745.RAA02827@putte.seeware.DIALix.oz.au> Resent-Message-ID: <199510010800.BAA20374@freefall.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
>Audit-Trail:
>Unformatted:
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