diff --git a/CHANGES b/CHANGES
index eef4ebcfd8..8cfb61e34b 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+5420.	[bug]		Add missing isc_{mutex,conditional}_destroy calls
+			that caused a memory leak on FreeBSD. [GL #1893]
+
 5419.	[func]		"dig +qid=<num>" sets the query ID to an arbitrary
 			value. "configure --enable-singletrace" allows
 			trace logging of a single query when QID is set to 0.
diff --git a/bin/named/server.c b/bin/named/server.c
index 5cb08d2e46..892b497a0d 100644
--- a/bin/named/server.c
+++ b/bin/named/server.c
@@ -10086,6 +10086,7 @@ named_server_destroy(named_server_t **serverp) {
 	dst_lib_destroy();
 
 	isc_event_free(&server->reload_event);
+	isc_mutex_destroy(&server->reload_event_lock);
 
 	INSIST(ISC_LIST_EMPTY(server->kasplist));
 	INSIST(ISC_LIST_EMPTY(server->viewlist));
diff --git a/doc/notes/notes-current.rst b/doc/notes/notes-current.rst
index 46d61fd32d..8289252f15 100644
--- a/doc/notes/notes-current.rst
+++ b/doc/notes/notes-current.rst
@@ -121,3 +121,6 @@ Bug Fixes
 -  When built without LMDB support, ``named`` failed to restart after a
    zone with a double quote (") in its name was added with ``rndc
    addzone``. Thanks to Alberto Fernández. [GL #1695]
+
+-  Missing mutex and conditional destruction in netmgr code leads to a
+   memory leak on *BSD systems. [GL #1893]
diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index 3f7723a1b4..9e4b692f80 100644
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -276,6 +276,9 @@ nm_destroy(isc_nm_t **mgr0) {
 
 		isc_queue_destroy(worker->ievents);
 		isc_queue_destroy(worker->ievents_prio);
+		isc_mutex_destroy(&worker->lock);
+		isc_condition_destroy(&worker->cond);
+
 		isc_mem_put(mgr->mctx, worker->recvbuf,
 			    ISC_NETMGR_RECVBUF_SIZE);
 		isc_thread_join(worker->thread, NULL);
@@ -768,9 +771,12 @@ nmsocket_cleanup(isc_nmsocket_t *sock, bool dofree) {
 	}
 
 	isc_astack_destroy(sock->inactivereqs);
+	sock->magic = 0;
 
 	isc_mem_free(sock->mgr->mctx, sock->ah_frees);
 	isc_mem_free(sock->mgr->mctx, sock->ah_handles);
+	isc_mutex_destroy(&sock->lock);
+	isc_condition_destroy(&sock->cond);
 
 	if (dofree) {
 		isc_nm_t *mgr = sock->mgr;
diff --git a/lib/isc/task.c b/lib/isc/task.c
index 5d9cef42ec..c0a5179375 100644
--- a/lib/isc/task.c
+++ b/lib/isc/task.c
@@ -1356,9 +1356,12 @@ static void
 manager_free(isc__taskmgr_t *manager) {
 	for (unsigned int i = 0; i < manager->workers; i++) {
 		isc_mutex_destroy(&manager->queues[i].lock);
+		isc_condition_destroy(&manager->queues[i].work_available);
 	}
 	isc_mutex_destroy(&manager->lock);
+	isc_mutex_destroy(&manager->excl_lock);
 	isc_mutex_destroy(&manager->halt_lock);
+	isc_condition_destroy(&manager->halt_cond);
 	isc_mem_put(manager->mctx, manager->queues,
 		    manager->workers * sizeof(isc__taskqueue_t));
 	manager->common.impmagic = 0;