[OpenAFS] rh71, oafs 1.04: unloading unused kernel module crash machine

[Simon Josefsson]

This seems pretty reproducable: On a vanilly redhat71 (i386) machine
with openafs client installed, unplug the network, restart afs (e.g.
reboot machine), and after it has timed out to the servers (and you
get to a login prompt), unload the kernel module.  Boom.  No OOPSes
but any disk related operations (i.e. almost anything) hang
indefinitely.  The machine still answers ping though (if you plug
network back in, that is).