Red Hat Bugzilla – Bug 216312
Summary: kernel Oops when mounting CD-ROM as user
Last modified: 2008-01-09 21:37:56 EST
Description of problem:
I just added a couple of lines to my /etc/fstab file in order to let me manually
mount CD's without having to switch to root:
/dev/hda /mnt/cdrom1 autofs noauto,user,ro 0 0
/dev/hdb /mnt/cdrom2 autofs noauto,user,ro 0 0
The trouble is that when I try to "mount /mnt/cdrom1" (using a FC6 SRPM CD), the
computer locks up. I can ping it from another machine, but there is no response
from the console, and I can't ssh in.
The first time this happened I didn't see anything in the system log to indicate
what the problem was. The second time I found the following message:
ov 18 19:53:00 hydra kernel: autofs: called with bogus options
Nov 18 19:53:00 hydra kernel: Unable to handle kernel NULL pointer dereference
at 0000000000000070 RIP:
Nov 18 19:53:00 hydra kernel: [<ffffffff88626793>]
Nov 18 19:53:00 hydra kernel: PGD 6fad9067 PUD 6e487067 PMD 0
Nov 18 19:53:00 hydra kernel: Oops: 0000  SMP
First, I don't understand what autofs is complaining about. I double-checked
the mount(8) man page, and noauto, user, and ro are all valid options.
Second, even if I did have bad options in /etc/fstab I don't think that should
cause a kernel crash!
Version-Release number of selected component (if applicable):
Three crashes out of three attempts. Previously I had been letting nautilus
auto-mount the drives, and most of the time it worked fine, though sometimes it
simply did nothing. In the latter case I'd have to mount the drive manually, as
root, using "mount -o ro /dev/hda /mnt/cdrom1", and that worked too. I can
still manually mount the disc as root.
Steps to Reproduce:
1. Add a line to /etc/fstab to mount a CD with the "noauto,user,ro" options and
"autofs" file system.
2. Switch to normal user mode.
3. mount /mnt/cdrom
Oops: 0000  SMP
Should have mounted the disc.
Sorry, I just noticed that kernel version was a typo. It should say:
(This is a mass-update to all current FC6 kernel bugs in NEW state)
I'm reviewing this bug list as part of the kernel bug triage project, an attempt
to isolate current bugs in the Fedora kernel.
I am CC'ing myself to this bug, however this version of Fedora is no longer
Please attempt to reproduce this bug with a current version of Fedora (presently
Fedora 8). If the bug no longer exists, please close the bug or I'll do so in a
few days if there is no further information lodged.
Thanks for using Fedora!
A few weeks after filing this bug I had upgraded the kernel to 2.6.18-1.2850.
Last September I upgraded to 188.8.131.52-49.fc6. I don't recall seeing any more
Oopses in all that time.