diff -urp LVM2.2.02.177.orig/tools/dmsetup.c LVM2.2.02.177/tools/dmsetup.c
--- LVM2.2.02.177.orig/tools/dmsetup.c	2018-01-26 15:22:40.000000000 +0000
+++ LVM2.2.02.177/tools/dmsetup.c	2018-01-26 16:41:10.574224457 +0000
@@ -2583,6 +2583,7 @@ static int _export(CMD_ARGS)
 	const char *name = NULL;
 	const char *uuid = NULL;
 	struct dm_info info;
+	struct dm_deps *deps;
 
 	if (names)
 		name = names->name;
@@ -2652,6 +2653,28 @@ static int _export(CMD_ARGS)
 		printf("\n");
 	}
 
+	dm_task_destroy(dmt);
+
+	if (!(dmt = dm_task_create(DM_DEVICE_DEPS)))
+		goto out;
+
+	name = NULL;
+	if (names)
+		name = names->name;
+	else if (argc == 2)
+		name = argv[1];
+
+	if (!_set_task_device(dmt, name, 0))
+		goto out;
+
+	if (!dm_task_run(dmt))
+		goto out;
+
+	if (!(deps = dm_task_get_deps(dmt)))
+		goto out;
+
+	printf("DM_DEPS=%d\n", deps->count);
+
 	r = 1;
       out:
 	if (dmt)