diff --git a/src/cpu.c b/src/cpu.c
index 79a820d39e..a89a0cca6a 100644
--- a/src/cpu.c
+++ b/src/cpu.c
@@ -225,6 +225,7 @@ void rt_cpus_unlock(rt_base_t level)
 
     if (pcpu->current_thread != RT_NULL)
     {
+        RT_ASSERT(pcpu->current_thread->cpus_lock_nest > 0);
         pcpu->current_thread->cpus_lock_nest--;
 
         if (pcpu->current_thread->cpus_lock_nest == 0)
diff --git a/src/idle.c b/src/idle.c
index 8b0a49c7f9..dcd278c628 100644
--- a/src/idle.c
+++ b/src/idle.c
@@ -292,7 +292,11 @@ static void rt_thread_system_entry(void *parameter)
 {
     while (1)
     {
-        rt_sem_take(&system_sem, RT_WAITING_FOREVER);
+        int ret= rt_sem_take(&system_sem, RT_WAITING_FOREVER);
+        if (ret != RT_EOK)
+        {
+            RT_ASSERT(0);
+        }
         rt_defunct_execute();
     }
 }
diff --git a/src/scheduler.c b/src/scheduler.c
index c62a6d143c..c760fa8ed9 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -666,6 +666,7 @@ void rt_scheduler_do_irq_switch(void *context)
 #endif /* RT_USING_OVERFLOW_CHECK */
                 RT_DEBUG_LOG(RT_DEBUG_SCHEDULER, ("switch in interrupt\n"));
 
+                RT_ASSERT(current_thread->cpus_lock_nest > 0);
                 current_thread->cpus_lock_nest--;
                 current_thread->scheduler_lock_nest--;
 
@@ -941,6 +942,7 @@ void rt_enter_critical(void)
     {
         rt_uint16_t lock_nest = current_thread->cpus_lock_nest;
         current_thread->cpus_lock_nest++;
+        RT_ASSERT(current_thread->cpus_lock_nest != 0);
         if (lock_nest == 0)
         {
             current_thread->scheduler_lock_nest ++;
@@ -999,6 +1001,7 @@ void rt_exit_critical(void)
 
     current_thread->critical_lock_nest --;
 
+    RT_ASSERT(current_thread->cpus_lock_nest > 0);
     current_thread->cpus_lock_nest--;
     if (current_thread->cpus_lock_nest == 0)
     {
diff --git a/src/signal.c b/src/signal.c
index d3972efbef..17618e2ed6 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -56,6 +56,7 @@ static void _signal_entry(void *parameter)
     {
         struct rt_cpu* pcpu = rt_cpu_self();
 
+        RT_ASSERT(current_thread->cpus_lock_nest > 0);
         pcpu->current_thread->cpus_lock_nest--;
         if (pcpu->current_thread->cpus_lock_nest == 0)
         {