检测sub group是否存循环引用

src/entry/Maat_rule.cpp

@@ -3607,6 +3607,15 @@ void do_scanner_update(struct Maat_scanner_t* scanner,MESA_lqueue_head garbage_q
 	GIE_create_para_t para;
 	para.gram_value=7;
 	para.position_accuracy=10;
+	igraph_bool_t is_dag;
+	igraph_is_dag(&(scanner->group_graph), &is_dag);
+	if(!is_dag)
+	{
+		MESA_handle_runtime_log(logger, RLOG_LV_FATAL, maat_module,
+								"Sub group cycle detected! Version %d",
+								scanner->version);
+		return;
+	}
 	find_group_paths(scanner);
 	
 	tmp1=create_bool_matcher(scanner->compile_hash,