diff --git a/CHANGES b/CHANGES
index 56ec886834..f459f0ae2b 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+3497.	[func]		When deleting a slave/stub zone using 'rndc delzone'
+			report the files that were being used so they can
+			be cleaned up if desired. [RT #27899]
+
 3496.	[placeholder]
 
 3495.	[func]		Support multiple response-policy zones (up to 32),
diff --git a/bin/named/control.c b/bin/named/control.c
index 1d9514b505..bd86b95b41 100644
--- a/bin/named/control.c
+++ b/bin/named/control.c
@@ -204,7 +204,7 @@ ns_control_docommand(isccc_sexpr_t *message, isc_buffer_t *text) {
 	} else if (command_compare(command, NS_COMMAND_ADDZONE)) {
 		result = ns_server_add_zone(ns_g_server, command);
 	} else if (command_compare(command, NS_COMMAND_DELZONE)) {
-		result = ns_server_del_zone(ns_g_server, command);
+		result = ns_server_del_zone(ns_g_server, command, text);
 	} else if (command_compare(command, NS_COMMAND_SIGNING)) {
 		result = ns_server_signing(ns_g_server, command, text);
 	} else if (command_compare(command, NS_COMMAND_ZONESTATUS)) {
diff --git a/bin/named/include/named/server.h b/bin/named/include/named/server.h
index 7e9aaada12..4ee84ea1b7 100644
--- a/bin/named/include/named/server.h
+++ b/bin/named/include/named/server.h
@@ -350,7 +350,7 @@ ns_server_add_zone(ns_server_t *server, char *args);
  * Deletes a zone from a running process
  */
 isc_result_t
-ns_server_del_zone(ns_server_t *server, char *args);
+ns_server_del_zone(ns_server_t *server, char *args, isc_buffer_t *text);
 
 /*%
  * Lists the status of the signing records for a given zone.
diff --git a/bin/named/server.c b/bin/named/server.c
index a82d023404..2558617d4a 100644
--- a/bin/named/server.c
+++ b/bin/named/server.c
@@ -8303,13 +8303,33 @@ ns_server_add_zone(ns_server_t *server, char *args) {
 	return (result);
 }
 
+static isc_boolean_t
+inuse(const char* file, isc_boolean_t first, isc_buffer_t *text) {
+#define INUSEMSG "The following files were in use and may now be removed:\n"
+	
+	if (file != NULL && isc_file_exists(file) &&
+	    isc_buffer_availablelength(text) >
+	    strlen(file) + (first ? sizeof(INUSEMSG) : 0))
+	{
+		if (first)
+			isc__buffer_putstr(text, INUSEMSG);
+		else
+			isc_buffer_putstr(text, "\n");
+		isc__buffer_putstr(text, file);
+		return (ISC_FALSE);
+	}
+	return (first);
+}
+
 /*
  * Act on a "delzone" command from the command channel.
  */
 isc_result_t
-ns_server_del_zone(ns_server_t *server, char *args) {
+ns_server_del_zone(ns_server_t *server, char *args, isc_buffer_t *text) {
 	isc_result_t	       result;
 	dns_zone_t	      *zone = NULL;
+	dns_zone_t	      *raw = NULL;
+	dns_zone_t	      *mayberaw;
 	dns_view_t	      *view = NULL;
 	dns_db_t	      *dbp = NULL;
 	const char	      *filename = NULL;
@@ -8318,6 +8338,7 @@ ns_server_del_zone(ns_server_t *server, char *args) {
 	const char	      *zonename = NULL;
 	size_t		       znamelen = 0;
 	FILE		      *ifp = NULL, *ofp = NULL;
+	isc_boolean_t	       exclusive = ISC_FALSE;
 
 	/* Parse parameters */
 	CHECK(zone_from_args(server, args, NULL, &zone, &zonename, ISC_TRUE));
@@ -8327,6 +8348,10 @@ ns_server_del_zone(ns_server_t *server, char *args) {
 		goto cleanup;
 	}
 
+	result = isc_task_beginexclusive(server->task);
+	RUNTIME_CHECK(result == ISC_R_SUCCESS);
+	exclusive = ISC_TRUE;
+
 	/*
 	 * Was this zone originally added at runtime?
 	 * If not, we can't delete it now.
@@ -8439,6 +8464,29 @@ ns_server_del_zone(ns_server_t *server, char *args) {
 		dns_zone_unload(zone);
 	}
 
+	/* Clean up stub / slave zone files */
+	dns_zone_getraw(zone, &raw);
+	mayberaw = (raw != NULL) ? raw : zone;
+	if (dns_zone_gettype(mayberaw) == dns_zone_slave ||
+	    dns_zone_gettype(mayberaw) == dns_zone_stub) {
+		const char *file;
+		isc_boolean_t first;
+
+		file = dns_zone_getfile(mayberaw);
+		first = inuse(file, ISC_TRUE, text);
+
+		file = dns_zone_getjournal(mayberaw);
+		first = inuse(file, first, text);
+
+		if (zone != mayberaw) {
+			file = dns_zone_getfile(zone);
+			first = inuse(file, first, text);
+
+			file = dns_zone_getjournal(zone);
+			first = inuse(file, first, text);
+		}
+	}
+
 	CHECK(dns_zt_unmount(view->zonetable, zone));
 
 	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL,
@@ -8448,6 +8496,8 @@ ns_server_del_zone(ns_server_t *server, char *args) {
 	result = ISC_R_SUCCESS;
 
  cleanup:
+	if (exclusive)
+		isc_task_endexclusive(server->task);
 	if (ifp != NULL)
 		isc_stdio_close(ifp);
 	if (ofp != NULL) {
@@ -8456,6 +8506,8 @@ ns_server_del_zone(ns_server_t *server, char *args) {
 	}
 	if (tmpname != NULL)
 		isc_mem_free(server->mctx, tmpname);
+	if (raw != NULL)
+		dns_zone_detach(&raw);
 	if (zone != NULL)
 		dns_zone_detach(&zone);
 
diff --git a/bin/tests/system/addzone/clean.sh b/bin/tests/system/addzone/clean.sh
index a4ce250bd4..e58215bb1e 100644
--- a/bin/tests/system/addzone/clean.sh
+++ b/bin/tests/system/addzone/clean.sh
@@ -17,7 +17,7 @@
 # $Id: clean.sh,v 1.3 2010/09/15 03:32:34 marka Exp $
 
 rm -f dig.out.*
-rm -f rndc.out.*
+rm -f rndc.out*
 rm -f ns2/named.conf
 rm -f */named.memstats
 rm -f ns2/*.nzf
diff --git a/bin/tests/system/addzone/tests.sh b/bin/tests/system/addzone/tests.sh
index 59456b3439..6eaacc54cc 100644
--- a/bin/tests/system/addzone/tests.sh
+++ b/bin/tests/system/addzone/tests.sh
@@ -133,6 +133,18 @@ n=`expr $n + 1`
 if [ $ret != 0 ]; then echo "I:failed"; fi
 status=`expr $status + $ret`
 
+echo "I:attempting to delete slave zone with inline signing ($n)"
+ret=0
+$RNDC -c ../common/rndc.conf -s 10.53.0.2 -p 9953 delzone inlineslave.example 2>&1 > rndc.out2.test$n
+grep '^inlineslave.bk$' rndc.out2.test$n > /dev/null || {
+	echo "I:failed to report inlineslave.bk"; ret=1;
+}
+grep '^inlineslave.bk.signed$' rndc.out2.test$n > /dev/null || {
+	echo "I:failed to report inlineslave.bk.signed"; ret=1;
+}
+n=`expr $n + 1`
+status=`expr $status + $ret`
+
 echo "I:reconfiguring server with multiple views"
 rm -f ns2/named.conf 
 cp -f ns2/named2.conf ns2/named.conf