I've also had another error come up a few times today; I have no idea
whether or not it's related to the DMA problem:

kernel: page fault trap, code=0
Stopped at      _aha_collect_mb0+0x42:  andl    $-0x5,0xb8(%eax)
-----------------------
Trevin Beattie          "Do not meddle in the affairs of wizards,
trevin@xmission.com     for you are crunchy and good with ketchup."
      {:->                                     --unknown