地址线使用下拉，app中也使用断言，线程栈默认填充0x23+pro，malloc失败直接进断言

source/rt_thread/src/thread.c

@@ -152,7 +152,7 @@ static rt_err_t _rt_thread_init(struct rt_thread *thread,
     thread->stack_size = stack_size;
 
     /* init thread stack */
-    rt_memset(thread->stack_addr, '#', thread->stack_size);
+    rt_memset(thread->stack_addr, '#'+priority, thread->stack_size);
 #ifdef ARCH_CPU_STACK_GROWS_UPWARD
     thread->sp = (void *)rt_hw_stack_init(thread->entry, thread->parameter,
                                           (void *)((char *)thread->stack_addr),