diff --git a/source/module/monitor_kernel_lib.c b/source/module/monitor_kernel_lib.c
index ade2616..f485a1d 100644
--- a/source/module/monitor_kernel_lib.c
+++ b/source/module/monitor_kernel_lib.c
@@ -305,6 +305,17 @@ int start_watch_variable(watch_arg warg) {
   return 0;
 }
 
+void init_work_all_hrTimer(void) {
+  int i = 0;
+  kernel_watch_timer *timer = NULL;
+  for (i = 0; i < kernel_wtimer_num; i++) {
+    timer = &(kernel_wtimer_list[i]);
+    // init work
+    INIT_WORK(&timer->wk, diag_task_info_work);
+  }
+  // printk(KERN_INFO "HrTimer work init,module keep %d hrtimer for now\n", kernel_wtimer_num);
+}
+
 /**
  * @brief clear watch with pid
  *
@@ -315,6 +326,7 @@ void clear_watch(pid_t pid) {
   cancel_all_hrTimer();      // just in case
   del_all_kwarg_by_pid(pid); // delete all kwarg with pid
   free_page_list(pid);       // free page with pid
+  init_work_all_hrTimer();
   start_all_hrTimer();       // restart timer
 }
 
@@ -342,11 +354,11 @@ enum hrtimer_restart check_variable_cb(struct hrtimer *timer) {
   if (j > 0) // if any threshold reached
   {
     k_watch_timer->threshold_num = j;
+    // highpri_wq
+    queue_work(system_highpri_wq, &k_watch_timer->wk);
     // restart timer after 5s
     hrtimer_forward(timer, timer->base->get_time(),
                     ktime_set(dump_reset_sec, 0)); //! todo
-    // highpri_wq
-    queue_work(system_highpri_wq, &k_watch_timer->wk);
   } else {
     // keep frequency
     hrtimer_forward(timer, timer->base->get_time(), k_watch_timer->kt);
diff --git a/source/module/monitor_timer.c b/source/module/monitor_timer.c
index 2eb768f..d669b76 100644
--- a/source/module/monitor_timer.c
+++ b/source/module/monitor_timer.c
@@ -3,7 +3,7 @@
 // Global variable
 kernel_watch_timer kernel_wtimer_list[MAX_TIMER_NUM] = {
     0};                    // all kernel_watch_timer
-int kernel_wtimer_num = 0; // current kernel_watch_timer number
+volatile int kernel_wtimer_num = 0; // current kernel_watch_timer number
 
 EXPORT_SYMBOL(kernel_wtimer_list); // export kernel_watch_timer_list
 EXPORT_SYMBOL(kernel_wtimer_num);  // export kernel_watch_timer_num
@@ -18,15 +18,19 @@ unsigned char del_all_kwarg_by_pid(pid_t pid) {
   kernel_watch_timer *timer = NULL;
 
   printk(KERN_INFO "del kwarg...");
-
+  // printk(KERN_INFO "del kwarg kernel_wtimer_num:%d", kernel_wtimer_num);
   for (i = 0; i < kernel_wtimer_num; i++) {
+    // printk(KERN_INFO "del watch i:%d", i);
     timer = &(kernel_wtimer_list[i]);
     timer_del_watch_by_pid(timer, pid);
   }
+  // printk(KERN_INFO "del kwarg kernel_wtimer_num:%d", kernel_wtimer_num);
   for (i = 0; i < kernel_wtimer_num; i++) {
+    // printk(KERN_INFO "del timer i:%d", i);
     timer = &(kernel_wtimer_list[i]);
     if (TIMER_NO_KWARG(timer)) // no available kwarg
     {
+      // printk(KERN_INFO "del timer empty %d", i);
       // cancel and destroy timer.work
       // make sure empty timer has no work active
       cancel_work_sync(&timer->wk);
diff --git a/source/module/monitor_timer.h b/source/module/monitor_timer.h
index 910fdcf..43c2e10 100644
--- a/source/module/monitor_timer.h
+++ b/source/module/monitor_timer.h
@@ -43,7 +43,7 @@ typedef struct {
 // Global variable
 extern kernel_watch_timer
     kernel_wtimer_list[MAX_TIMER_NUM]; // all kernel_watch_timer
-extern int kernel_wtimer_num;          // current kernel_watch_timer number
+extern volatile int kernel_wtimer_num;          // current kernel_watch_timer number
 
 // EXPORT_SYMBOL(kernel_wtimer_list); // export kernel_watch_timer_list
 // EXPORT_SYMBOL(kernel_wtimer_num);  // export kernel_watch_timer_num