diff --git a/CHANGES b/CHANGES
index 71b31cd4da..5488b898e6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+5840.	[cleanup]	Remove multiple application context use in dns_client
+			unit. [GL !6041]
+
 5839.	[func]		Add support for remote TLS certificates
 			verification, both to BIND and dig, making it possible
 			to implement Strict and Mutual TLS authentication,
diff --git a/bin/delv/delv.c b/bin/delv/delv.c
index dc87d1f4c1..bfdc975e88 100644
--- a/bin/delv/delv.c
+++ b/bin/delv/delv.c
@@ -1718,12 +1718,10 @@ main(int argc, char *argv[]) {
 	dns_rdataset_t *rdataset;
 	dns_namelist_t namelist;
 	unsigned int resopt;
-	isc_appctx_t *actx = NULL;
 	isc_nm_t *netmgr = NULL;
 	isc_taskmgr_t *taskmgr = NULL;
 	isc_timermgr_t *timermgr = NULL;
 	dns_master_style_t *style = NULL;
-	struct sigaction sa;
 
 	progname = argv[0];
 	preparse_args(argc, argv);
@@ -1738,8 +1736,6 @@ main(int argc, char *argv[]) {
 		fatal("dst_lib_init failed: %d", result);
 	}
 
-	CHECK(isc_appctx_create(mctx, &actx));
-
 	isc_managers_create(mctx, 1, 0, &netmgr, &taskmgr, &timermgr);
 
 	parse_args(argc, argv);
@@ -1748,18 +1744,9 @@ main(int argc, char *argv[]) {
 
 	setup_logging(stderr);
 
-	CHECK(isc_app_ctxstart(actx));
-
-	/* Unblock SIGINT if it's been blocked by isc_app_ctxstart() */
-	memset(&sa, 0, sizeof(sa));
-	sa.sa_handler = SIG_DFL;
-	if (sigfillset(&sa.sa_mask) != 0 || sigaction(SIGINT, &sa, NULL) < 0) {
-		fatal("Couldn't set up signal handler");
-	}
-
 	/* Create client */
-	result = dns_client_create(mctx, actx, taskmgr, netmgr, timermgr, 0,
-				   &client, srcaddr4, srcaddr6);
+	result = dns_client_create(mctx, taskmgr, netmgr, timermgr, 0, &client,
+				   srcaddr4, srcaddr6);
 	if (result != ISC_R_SUCCESS) {
 		delv_log(ISC_LOG_ERROR, "dns_client_create: %s",
 			 isc_result_totext(result));
@@ -1844,9 +1831,6 @@ cleanup:
 
 	isc_managers_destroy(&netmgr, &taskmgr, &timermgr);
 
-	if (actx != NULL) {
-		isc_appctx_destroy(&actx);
-	}
 	if (lctx != NULL) {
 		isc_log_destroy(&lctx);
 	}
diff --git a/bin/tests/system/resolve.c b/bin/tests/system/resolve.c
index d563d92d8b..7d489df7ca 100644
--- a/bin/tests/system/resolve.c
+++ b/bin/tests/system/resolve.c
@@ -56,7 +56,6 @@
  */
 
 isc_mem_t *ctxs_mctx = NULL;
-isc_appctx_t *ctxs_actx = NULL;
 isc_nm_t *ctxs_netmgr = NULL;
 isc_taskmgr_t *ctxs_taskmgr = NULL;
 isc_timermgr_t *ctxs_timermgr = NULL;
@@ -65,40 +64,15 @@ static void
 ctxs_destroy(void) {
 	isc_managers_destroy(&ctxs_netmgr, &ctxs_taskmgr, &ctxs_timermgr);
 
-	if (ctxs_actx != NULL) {
-		isc_appctx_destroy(&ctxs_actx);
-	}
-
-	if (ctxs_mctx != NULL) {
-		isc_mem_destroy(&ctxs_mctx);
-	}
+	isc_mem_destroy(&ctxs_mctx);
 }
 
-static isc_result_t
+static void
 ctxs_init(void) {
-	isc_result_t result;
-
 	isc_mem_create(&ctxs_mctx);
 
-	result = isc_appctx_create(ctxs_mctx, &ctxs_actx);
-	if (result != ISC_R_SUCCESS) {
-		goto fail;
-	}
-
 	isc_managers_create(ctxs_mctx, 1, 0, &ctxs_netmgr, &ctxs_taskmgr,
 			    &ctxs_timermgr);
-
-	result = isc_app_ctxstart(ctxs_actx);
-	if (result != ISC_R_SUCCESS) {
-		goto fail;
-	}
-
-	return (ISC_R_SUCCESS);
-
-fail:
-	ctxs_destroy();
-
-	return (result);
 }
 
 static char *algname = NULL;
@@ -392,10 +366,7 @@ main(int argc, char *argv[]) {
 		altserveraddr = cp + 1;
 	}
 
-	result = ctxs_init();
-	if (result != ISC_R_SUCCESS) {
-		goto cleanup;
-	}
+	ctxs_init();
 
 	result = dst_lib_init(ctxs_mctx, NULL);
 	if (result != ISC_R_SUCCESS) {
@@ -404,9 +375,9 @@ main(int argc, char *argv[]) {
 	}
 
 	clientopt = 0;
-	result = dns_client_create(ctxs_mctx, ctxs_actx, ctxs_taskmgr,
-				   ctxs_netmgr, ctxs_timermgr, clientopt,
-				   &client, addr4, addr6);
+	result = dns_client_create(ctxs_mctx, ctxs_taskmgr, ctxs_netmgr,
+				   ctxs_timermgr, clientopt, &client, addr4,
+				   addr6);
 	if (result != ISC_R_SUCCESS) {
 		fprintf(stderr, "dns_client_create failed: %u, %s\n", result,
 			isc_result_totext(result));
@@ -490,10 +461,7 @@ main(int argc, char *argv[]) {
 	dns_client_freeresanswer(client, &namelist);
 
 	/* Cleanup */
-cleanup:
-	if (client != NULL) {
-		dns_client_detach(&client);
-	}
+	dns_client_detach(&client);
 
 	ctxs_destroy();
 	dst_lib_destroy();
diff --git a/lib/dns/client.c b/lib/dns/client.c
index 4385aa1db4..412d708ea4 100644
--- a/lib/dns/client.c
+++ b/lib/dns/client.c
@@ -84,7 +84,9 @@ struct dns_client {
 	unsigned int attributes;
 	isc_mutex_t lock;
 	isc_mem_t *mctx;
-	isc_appctx_t *actx;
+	bool readydone;
+	isc_mutex_t readylock;
+	isc_condition_t ready;
 	isc_taskmgr_t *taskmgr;
 	isc_task_t *task;
 	isc_nm_t *nm;
@@ -261,8 +263,8 @@ createview(isc_mem_t *mctx, dns_rdataclass_t rdclass, isc_taskmgr_t *taskmgr,
 }
 
 isc_result_t
-dns_client_create(isc_mem_t *mctx, isc_appctx_t *actx, isc_taskmgr_t *taskmgr,
-		  isc_nm_t *nm, isc_timermgr_t *timermgr, unsigned int options,
+dns_client_create(isc_mem_t *mctx, isc_taskmgr_t *taskmgr, isc_nm_t *nm,
+		  isc_timermgr_t *timermgr, unsigned int options,
 		  dns_client_t **clientp, const isc_sockaddr_t *localaddr4,
 		  const isc_sockaddr_t *localaddr6) {
 	isc_result_t result;
@@ -281,11 +283,16 @@ dns_client_create(isc_mem_t *mctx, isc_appctx_t *actx, isc_taskmgr_t *taskmgr,
 
 	client = isc_mem_get(mctx, sizeof(*client));
 	*client = (dns_client_t){
-		.actx = actx, .taskmgr = taskmgr, .timermgr = timermgr, .nm = nm
+		.taskmgr = taskmgr,
+		.timermgr = timermgr,
+		.nm = nm,
 	};
 
 	isc_mutex_init(&client->lock);
 
+	isc_mutex_init(&client->readylock);
+	isc_condition_init(&client->ready);
+
 	result = isc_task_create(client->taskmgr, 0, &client->task);
 	if (result != ISC_R_SUCCESS) {
 		goto cleanup_lock;
@@ -395,6 +402,9 @@ destroyclient(dns_client_t *client) {
 
 	isc_task_detach(&client->task);
 
+	isc_condition_destroy(&client->ready);
+	isc_mutex_destroy(&client->readylock);
+
 	isc_mutex_destroy(&client->lock);
 	client->magic = 0;
 
@@ -930,23 +940,12 @@ client_resfind(resctx_t *rctx, dns_fetchevent_t *event) {
 	UNLOCK(&rctx->lock);
 }
 
-static void
-suspend(isc_task_t *task, isc_event_t *event) {
-	isc_appctx_t *actx = event->ev_arg;
-
-	UNUSED(task);
-
-	isc_app_ctxsuspend(actx);
-	isc_event_free(&event);
-}
-
 static void
 resolve_done(isc_task_t *task, isc_event_t *event) {
 	resarg_t *resarg = event->ev_arg;
 	dns_clientresevent_t *rev = (dns_clientresevent_t *)event;
 	dns_name_t *name = NULL;
 	dns_client_t *client = resarg->client;
-	isc_result_t result;
 
 	UNUSED(task);
 
@@ -967,16 +966,12 @@ resolve_done(isc_task_t *task, isc_event_t *event) {
 		UNLOCK(&resarg->lock);
 
 		/*
-		 * We may or may not be running.  isc__appctx_onrun will
-		 * fail if we are currently running otherwise we post a
-		 * action to call isc_app_ctxsuspend when we do start
-		 * running.
+		 * Signal that the entire process is done.
 		 */
-		result = isc_app_ctxonrun(resarg->actx, client->mctx, task,
-					  suspend, resarg->actx);
-		if (result == ISC_R_ALREADYRUNNING) {
-			isc_app_ctxsuspend(resarg->actx);
-		}
+		LOCK(&client->readylock);
+		client->readydone = true;
+		SIGNAL(&client->ready);
+		UNLOCK(&client->readylock);
 	} else {
 		/*
 		 * We have already exited from the loop (due to some
@@ -998,13 +993,11 @@ dns_client_resolve(dns_client_t *client, const dns_name_t *name,
 	resarg_t *resarg = NULL;
 
 	REQUIRE(DNS_CLIENT_VALID(client));
-	REQUIRE(client->actx != NULL);
 	REQUIRE(namelist != NULL && ISC_LIST_EMPTY(*namelist));
 
 	resarg = isc_mem_get(client->mctx, sizeof(*resarg));
 
 	*resarg = (resarg_t){
-		.actx = client->actx,
 		.client = client,
 		.result = DNS_R_SERVFAIL,
 		.namelist = namelist,
@@ -1022,10 +1015,13 @@ dns_client_resolve(dns_client_t *client, const dns_name_t *name,
 	}
 
 	/*
-	 * Start internal event loop.  It blocks until the entire process
-	 * is completed.
+	 * Block until the entire process is completed.
 	 */
-	result = isc_app_ctxrun(client->actx);
+	LOCK(&client->readylock);
+	if (!client->readydone) {
+		WAIT(&client->ready, &client->readylock);
+	}
+	UNLOCK(&client->readylock);
 
 	LOCK(&resarg->lock);
 	if (result == ISC_R_SUCCESS || result == ISC_R_SUSPEND) {
diff --git a/lib/dns/include/dns/client.h b/lib/dns/include/dns/client.h
index ec70f92d88..f2cf41def3 100644
--- a/lib/dns/include/dns/client.h
+++ b/lib/dns/include/dns/client.h
@@ -89,8 +89,8 @@ typedef struct dns_clientresevent {
 } dns_clientresevent_t; /* too long? */
 
 isc_result_t
-dns_client_create(isc_mem_t *mctx, isc_appctx_t *actx, isc_taskmgr_t *taskmgr,
-		  isc_nm_t *nm, isc_timermgr_t *timermgr, unsigned int options,
+dns_client_create(isc_mem_t *mctx, isc_taskmgr_t *taskmgr, isc_nm_t *nm,
+		  isc_timermgr_t *timermgr, unsigned int options,
 		  dns_client_t **clientp, const isc_sockaddr_t *localaddr4,
 		  const isc_sockaddr_t *localaddr6);
 /*%<
@@ -109,8 +109,6 @@ dns_client_create(isc_mem_t *mctx, isc_appctx_t *actx, isc_taskmgr_t *taskmgr,
  *
  *\li	'mctx' is a valid memory context.
  *
- *\li	'actx' is a valid application context.
- *
  *\li	'taskmgr' is a valid task manager.
  *
  *\li	'nm' is a valid network manager.