I have a 1.3.2 system with an IDE disk that was showing some corrected
soft errors in my logs, so I wanted to check the disk with dd.  I did
the following:

    dd if=/dev/rwd0f of=/dev/null bs=8192k

and the system promptly panic'ed.  In retrospect, that seems like a
large block size, but I didn't expect a panic... is this a bug, or
operator error?