diff --git a/CHANGES b/CHANGES
index d0dfc2a36f..86eb70b374 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+5804.	[func]		Add a debug log message when starting and ending
+			the task exclusive mode. [GL #3137]
+
 5803.	[func]		Use compile-time paths in the documentation.
 			[GL #2717]
 
diff --git a/doc/notes/notes-current.rst b/doc/notes/notes-current.rst
index f5abcd8a83..ded784f7a7 100644
--- a/doc/notes/notes-current.rst
+++ b/doc/notes/notes-current.rst
@@ -41,6 +41,11 @@ Feature Changes
   by a client are now included in the client information sent to DLZ
   modules when processing queries. :gl:`#3082`
 
+- Add DEBUG(1) level messages when starting and ending BIND 9 task exclusive mode
+  that stops the normal DNS operation (f.e. for reconfiguration, interface
+  scans, and other events that require exclusive access to a shared resources).
+  :gl:`#3137`
+
 Bug Fixes
 ~~~~~~~~~
 
diff --git a/lib/isc/task.c b/lib/isc/task.c
index d0f9d9be38..666eb13fb2 100644
--- a/lib/isc/task.c
+++ b/lib/isc/task.c
@@ -25,6 +25,7 @@
 #include <isc/atomic.h>
 #include <isc/condition.h>
 #include <isc/event.h>
+#include <isc/log.h>
 #include <isc/magic.h>
 #include <isc/mem.h>
 #include <isc/once.h>
@@ -1107,8 +1108,20 @@ isc_task_beginexclusive(isc_task_t *task) {
 		return (ISC_R_LOCKBUSY);
 	}
 
+	if (isc_log_wouldlog(isc_lctx, ISC_LOG_DEBUG(1))) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_OTHER, ISC_LOG_DEBUG(1),
+			      "exclusive task mode: %s", "starting");
+	}
+
 	isc_nm_pause(manager->netmgr);
 
+	if (isc_log_wouldlog(isc_lctx, ISC_LOG_DEBUG(1))) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_OTHER, ISC_LOG_DEBUG(1),
+			      "exclusive task mode: %s", "started");
+	}
+
 	return (ISC_R_SUCCESS);
 }
 
@@ -1120,7 +1133,20 @@ isc_task_endexclusive(isc_task_t *task) {
 	REQUIRE(task->state == task_state_running);
 	manager = task->manager;
 
+	if (isc_log_wouldlog(isc_lctx, ISC_LOG_DEBUG(1))) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_OTHER, ISC_LOG_DEBUG(1),
+			      "exclusive task mode: %s", "ending");
+	}
+
 	isc_nm_resume(manager->netmgr);
+
+	if (isc_log_wouldlog(isc_lctx, ISC_LOG_DEBUG(1))) {
+		isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+			      ISC_LOGMODULE_OTHER, ISC_LOG_DEBUG(1),
+			      "exclusive task mode: %s", "ended");
+	}
+
 	REQUIRE(atomic_compare_exchange_strong(&manager->exclusive_req,
 					       &(bool){ true }, false));
 }