Does the segfaulting.

def Run(self, unused_args):
    """Does the segfaulting."""
    if flags.FLAGS.pdb_post_mortem:
      logging.warning("Segfault action requested :(")
      print(ctypes.cast(1, ctypes.POINTER(ctypes.c_void_p)).contents)
    else:
      logging.warning("Segfault requested but not running in debug mode.")