wait_for_submit
err = wait_for_submit(engine, rq[A2], HZ / 2);
err = wait_for_submit(engine, rq[B1], HZ / 2);
err = wait_for_submit(engine, rq, HZ / 2);
err = wait_for_submit(engine, nop, HZ / 2);
if (wait_for_submit(engine, rq, HZ / 2)) {
err = wait_for_submit(engine, rq, HZ / 2);
err = wait_for_submit(engine, rq, HZ / 2);
err = wait_for_submit(engine, client[0], HZ / 2);
if (wait_for_submit(engine, hang, HZ / 2)) {
err = wait_for_submit(engine, rq, HZ / 2);
err = wait_for_submit(engine, rq, HZ / 2);
err = wait_for_submit(rq->engine, rq, HZ / 2);