RQ_TRACE
RQ_TRACE(rq, "on hold\n");
RQ_TRACE(rq, "hold release\n");
RQ_TRACE(request, "ancestor on hold\n");
RQ_TRACE(rq, "guilty? %s\n", str_yes_no(guilty));
RQ_TRACE(request, "-EIO\n");
RQ_TRACE(rq, "\n");
RQ_TRACE(rq, "\n");
RQ_TRACE(rq, "\n");
RQ_TRACE(rq, "error: %d\n", rq->fence.error);
RQ_TRACE(request, "\n");
RQ_TRACE(request, "\n");