William Knop wrote:

quoted

This code starts:

  0:   8b 55 04                  mov    0x4(%ebp),%edx
  3:   83 c1 08                  add    $0x8,%ecx

and as %ebp is 01000000, this oopses.
It looks very much like a single-bit memory error (as has already been
suggested as a possibility).

Oh my. So, I ran memcheck again for a few hours, and it checked out 
fine. Just in case, though, I bought a replacement stick of ram. Well, 
the oopses went away, so it must have been the ram.

For future reference, I have had errors show up after 24-36 hours of memtest86. I usually find that 
if it passes 48 hours of testing then things are looking pretty reliable. A couple of hours is 
usually too small a sample to rely on.

Brad