From the annals of epic bug reports, "Simultaneous cat and external keyboard input causing kernel panic":
I encountered a kernel panic with the 3.1.0 kernel on a Dell Latitude
E6410 while inputting simultaneously from the integrated keyboard with
a cat and from the external keyboard myself. I was trying to type my
password with the external keyboard (pw dialog already visible), but I
noticed that the computer didn't seem responsive to my typing. Then
suddenly the cat shifted his position and there was a kernel panic
involving input handling. I'm now using i8042.nokbd kernel parameter
as a workaround, something I've found useful also earlier.I wonder if anyone else is experiencing similar problems? This didn't
seem to happen with 3.0, which was the first kernel version I used on
this E6410. Although it has to be noted that the internal keyboard
input was not yet as heavy either at that time. Please test if you can
reproduce the problem.
Simultaneous cat and external keyboard input causing kernel panic