def METHOD_NAME(self):
    extra_options = {"sync": self.params["inc_sync_mode"],
                     "bitmap": self._bitmaps[0],
                     "on-target-error": self.params["on_target_error"],
                     "auto_disable_bitmap": False}
    inc_backup = backup_utils.blockdev_backup_qmp_cmd
    cmd, arguments = inc_backup(self._source_nodes[0],
                                self.params["inc_node"],
                                **extra_options)
    self.main_vm.monitor.cmd(cmd, arguments)
    timeout = self.params.get("job_timeout", 600)
    job_id = arguments.get("job-id", self._source_nodes[0])
    get_event = job_utils.get_event_by_condition
    event = get_event(self.main_vm, job_utils.BLOCK_JOB_ERROR_EVENT,
                      timeout, device=job_id, action='ignore')
    if not event:
        self.test.fail("Backup job can't reach error after %s seconds"
                       % timeout)
    process.system(self.params['lv_extend_cmd'],
                   ignore_status=False, shell=True)
    job_utils.wait_until_block_job_completed(self.main_vm, job_id, timeout)