Fixed config reload and disabling RRL.

Either set it to 0 or comment out the statement.

src/knot/server/server.c

@@ -619,9 +619,16 @@ int server_conf_hook(const struct conf_t *conf, void *data)
 	}
 	if (server->rrl) {
 		if (rrl_rate(server->rrl) != (uint32_t)conf->rrl) {
+			/* We cannot free it, threads may use it.
+			 * Setting it to <1 will disable rate limiting. */
+			if (conf->rrl < 1) {
+				log_server_info("Rate limiting disabled.\n");
+			} else {
+				log_server_info("Rate limiting set to %u "
+				                "responses/sec.\n", conf->rrl);
+			}
 			rrl_setrate(server->rrl, conf->rrl);
-			log_server_info("Rate limiting set to %u responses/sec.\n",
-			                conf->rrl);
+
 		} /* At this point, old buckets will converge to new rate. */
 	}
 

src/knot/server/udp-handler.c

@@ -216,7 +216,7 @@ int udp_handle(struct answer_ctx *ans, int fd,
 	}
 
 	/* Process RRL. */
-	if (knot_unlikely(rrl != NULL)) {
+	if (knot_unlikely(rrl != NULL) && rrl->rate > 0) {
 		rrl_req_t rrl_rq;
 		memset(&rrl_rq, 0, sizeof(rrl_req_t));
 		rrl_rq.w = qbuf; /* Wire */