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>]
:autofs4:autofs4_kill_sb+0x40/0xfd
Nov 18 19:53:00 hydra kernel: PGD 6fad9067 PUD 6e487067 PMD 0 
Nov 18 19:53:00 hydra kernel: Oops: 0000 [1] 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):
kernel-2.6.17-1.2798.fc6.x86_64

How reproducible:
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
  
Actual results:
Oops: 0000 [1] SMP

Expected results:
Should have mounted the disc.

Additional info:
autofs-5.0.1-0.rc2.10