Comment 7 for bug 459485

NaSH, any chance you could reinstall dmsetup or dmraid (one at a time) and see which of the two caused this breakage? (I suppose it was dmraid, but let's check). After you identified the package, can you please do

  sudo udevadm test `udevadm info --query=path --name=/dev/mapper/nvidia_xxxxxx`

(with the actual name instead of xxxxx, of course)

Please copy&paste the entire output.

Thanks!