diff --git a/src/client/src/tscSystem.c b/src/client/src/tscSystem.c
index c04765b0651f59066dd5897f2eaf0924b7113a21..8af340030cccee1431a82eb88344642011f2e019 100644
--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -122,6 +122,10 @@ int32_t tscAcquireRpc(const char *key, const char *user, const char *secretEncry
 
 void taos_init_imp(void) {
   char temp[128] = {0};
+
+  // In the APIs of other program language, taos_cleanup is not available yet.
+  // So, to make sure taos_cleanup will be invoked to clean up the allocated resource to suppress the valgrind warning.
+  atexit(taos_cleanup);
   
   errno = TSDB_CODE_SUCCESS;
   srand(taosGetTimestampSec());
@@ -197,10 +201,6 @@ void taos_init_imp(void) {
 
   tscRefId = taosOpenRef(200, tscCloseTscObj);
 
-  // In the APIs of other program language, taos_cleanup is not available yet.
-  // So, to make sure taos_cleanup will be invoked to clean up the allocated resource to suppress the valgrind warning.
-  atexit(taos_cleanup);
-
   tscDebug("client is initialized successfully");
 }
 
diff --git a/src/util/src/tcache.c b/src/util/src/tcache.c
index 69b3741e13c9e0b3ee00615a29851a3f690a1e84..776a0ad9c83c0f133a23f4f2832acd473ed6ccec 100644
--- a/src/util/src/tcache.c
+++ b/src/util/src/tcache.c
@@ -71,6 +71,8 @@ static pthread_once_t cacheThreadInit = PTHREAD_ONCE_INIT;
 static pthread_mutex_t guard          = PTHREAD_MUTEX_INITIALIZER;
 static SArray* pCacheArrayList        = NULL;
 static bool    stopRefreshWorker      = false;
+static bool    refreshWorkerNormalStopped       = false;
+static bool    refreshWorkerUnexpectedStopped   = false;
 
 static void doInitRefreshThread(void) {
   pCacheArrayList = taosArrayInit(4, POINTER_BYTES);
@@ -537,7 +539,10 @@ void taosCacheCleanup(SCacheObj *pCacheObj) {
   pCacheObj->deleting = 1;
 
   // wait for the refresh thread quit before destroying the cache object.
+  // But in the dll, the child thread will be killed before atexit takes effect.
   while(atomic_load_8(&pCacheObj->deleting) != 0) {
+    if (refreshWorkerNormalStopped) break;    
+    if (refreshWorkerUnexpectedStopped) return;    
     taosMsleep(50);
   }
 
@@ -676,6 +681,12 @@ static void doCacheRefresh(SCacheObj* pCacheObj, int64_t time, __cache_free_fn_t
   taosHashCondTraverse(pCacheObj->pHashTable, travHashTableFn, &sup);
 }
 
+void taosCacheRefreshWorkerUnexpectedStopped(void) {
+  if(!refreshWorkerNormalStopped) {
+    refreshWorkerUnexpectedStopped=true;
+  }
+}
+
 void* taosCacheTimedRefresh(void *handle) {
   assert(pCacheArrayList != NULL);
   uDebug("cache refresh thread starts");
@@ -684,6 +695,7 @@ void* taosCacheTimedRefresh(void *handle) {
 
   const int32_t SLEEP_DURATION = 500; //500 ms
   int64_t count = 0;
+  atexit(taosCacheRefreshWorkerUnexpectedStopped);
 
   while(1) {
     taosMsleep(SLEEP_DURATION);
@@ -748,6 +760,7 @@ void* taosCacheTimedRefresh(void *handle) {
 
   pCacheArrayList = NULL;
   pthread_mutex_destroy(&guard);
+  refreshWorkerNormalStopped=true;
 
   uDebug("cache refresh thread quits");
   return NULL;
@@ -762,6 +775,6 @@ void taosCacheRefresh(SCacheObj *pCacheObj, __cache_free_fn_t fp) {
   doCacheRefresh(pCacheObj, now, fp);
 }
 
-void taosStopCacheRefreshWorker() {
-  stopRefreshWorker = false;
+void taosStopCacheRefreshWorker(void) {
+  stopRefreshWorker = true;
 }
\ No newline at end of file