diff --git a/src/ipc.c b/src/ipc.c
index 111d724c2326f45fdcf4b1623dbbf5d44bcf5cce..22e0f06bc6c5f459329df19e383a740d600298b4 100755
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -124,6 +124,7 @@ rt_inline rt_err_t rt_ipc_list_suspend(rt_list_t        *list,
         break;
 
     default:
+        RT_ASSERT(0);
         break;
     }
 
diff --git a/src/thread.c b/src/thread.c
index 34e96077d1a3f4fe653cb4df04932f0baf955c1e..e03c027eff82f348455c7e6ad447fe0fc2fad8b5 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -358,6 +358,8 @@ RTM_EXPORT(rt_thread_startup);
  */
 rt_err_t rt_thread_detach(rt_thread_t thread)
 {
+    rt_base_t lock;
+
     /* thread check */
     RT_ASSERT(thread != RT_NULL);
     RT_ASSERT(rt_object_get_type((rt_object_t)thread) == RT_Object_Class_Thread);
@@ -377,12 +379,18 @@ rt_err_t rt_thread_detach(rt_thread_t thread)
     /* release thread timer */
     rt_timer_detach(&(thread->thread_timer));
 
+    /* disable interrupt */
+    lock = rt_hw_interrupt_disable();
+
     /* change stat */
     thread->stat = RT_THREAD_CLOSE;
 
     /* detach thread object */
     rt_object_detach((rt_object_t)thread);
 
+    /* enable interrupt */
+    rt_hw_interrupt_enable(lock);
+
     return RT_EOK;
 }
 RTM_EXPORT(rt_thread_detach);