[Bug 239372] [NEW] kernel oops 'Unable to handle kernel NULL pointer dereference' on generic_make_request

[Rocko]

Public bug reported:

Binary package hint: linux-image

My 2.6.24-19-generic amd64 kernel froze while trying to read a
smartcard. It appeared initially to be a gnome/nautilus problem, but the
problem also showed up when I tried to 'ls' the mount folder, and
restarting X did not fix it - I had to reboot the machine.

How I did it:

I double-clicked on the 2.0 GB Media icon on the desktop (at 12.34 - see
the matching kernel oops in syslog); nothing happened. Then nautilus
wouldn't open from anywhere (either from Gnome or the command line - see
attached strace-nautilus.log).

If it's relevant, Xorg.0.log started showing:

SetGrabKeysState - disabled
SetGrabKeysState - enabled
tossed event which came in late
tossed event which came in late
tossed event which came in late
mieqEnequeue: out-of-order valuator event; dropping.
tossed event which came in late
mieqEnequeue: out-of-order valuator event; dropping.
...


After forcing all nautilus windows to close and re-running nautilus, every X window froze for around 30 seconds. Then all went back to normal (X windows unfroze and nautilus started opening normally etc) UNTIL I tried reading the 2.0 GB Media folder again, whereupon nautilus froze again and couldn't be killed with sudo kill -9.

Version info:

kernel 2.6.24-19-generic (amd64)
nautilus 1:2.22.3-0ubuntu2 
hal 0.5.11~rc2-1ubuntu8.1

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

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kernel oops 'Unable to handle kernel NULL pointer dereference' on generic_make_request
https://bugs.launchpad.net/bugs/239372
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