--- x/mm/migrate.c
+++ y/mm/migrate.c
@@ -928,6 +928,8 @@ static int fallback_migrate_folio(struct
 		default:
 			return -EBUSY;
 		}
+		if (folio_test_writeback(src))
+			return -EBUSY;
 		return writeout(mapping, src);
 	}