diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index b54701a311dd975d60f25a0c6f70eeb5e492ed6b..349564ae28b8601565d57533ae57b5a1b49e51f5 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -1463,7 +1463,7 @@ static char* formatTimestamp(char* buf, int64_t val, int precision) {
 }
 
 void blockDebugShowData(const SArray* dataBlocks) {
-  char    pBuf[128];
+  char    pBuf[128] = {0};
   int32_t sz = taosArrayGetSize(dataBlocks);
   for (int32_t i = 0; i < sz; i++) {
     SSDataBlock* pDataBlock = taosArrayGet(dataBlocks, i);
diff --git a/source/common/src/ttime.c b/source/common/src/ttime.c
index 8117acc3e14ad2e033cb0415f9abb54576f72add..10ba58af298c59306badc2e299e588e3ec46874f 100644
--- a/source/common/src/ttime.c
+++ b/source/common/src/ttime.c
@@ -783,7 +783,7 @@ int64_t taosTimeTruncate(int64_t t, const SInterval* pInterval, int32_t precisio
 //     2020-07-03 17:48:42
 // and the parameter can also be a variable.
 const char* fmtts(int64_t ts) {
-  static char buf[96];
+  static char buf[96] = {0};
   size_t      pos = 0;
   struct tm   tm;
 
diff --git a/source/dnode/mnode/impl/src/mndMain.c b/source/dnode/mnode/impl/src/mndMain.c
index 995fe83cc5a69502a99a1b807ceffb6c4ec80a52..0ac36c20ed3463a5bd9e794c83edab22b1675408 100644
--- a/source/dnode/mnode/impl/src/mndMain.c
+++ b/source/dnode/mnode/impl/src/mndMain.c
@@ -369,8 +369,8 @@ int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
     mError("failed to process sync msg:%p type:%s since %s", pMsg, TMSG_INFO(pMsg->msgType), terrstr());
     return TAOS_SYNC_PROPOSE_OTHER_ERROR;
   }
-
-  char  logBuf[512];
+ 
+  char  logBuf[512] = {0};
   char *syncNodeStr = sync2SimpleStr(pMgmt->sync);
   snprintf(logBuf, sizeof(logBuf), "==vnodeProcessSyncReq== msgType:%d, syncNode: %s", pMsg->msgType, syncNodeStr);
   syncRpcMsgLog2(logBuf, pMsg);
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 5ad8df11a922e14b470b5e09a916c8cb4c70a239..5f2901e4585c9efc14b810f09124ec14cd220746 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -815,7 +815,7 @@ int32_t syncNodeSendMsgByInfo(const SNodeInfo* nodeInfo, SSyncNode* pSyncNode, S
 }
 
 cJSON* syncNode2Json(const SSyncNode* pSyncNode) {
-  char   u64buf[128];
+  char   u64buf[128] = {0};
   cJSON* pRoot = cJSON_CreateObject();
 
   if (pSyncNode != NULL) {
diff --git a/source/libs/sync/src/syncMessage.c b/source/libs/sync/src/syncMessage.c
index 0452410a209f22b0138a97819367d20b23cee9a2..707e6c3e7b6d0e586cd5f76e95b8f6e51f7c2745 100644
--- a/source/libs/sync/src/syncMessage.c
+++ b/source/libs/sync/src/syncMessage.c
@@ -215,7 +215,7 @@ SyncTimeout* syncTimeoutFromRpcMsg2(const SRpcMsg* pRpcMsg) {
 }
 
 cJSON* syncTimeout2Json(const SyncTimeout* pMsg) {
-  char   u64buf[128];
+  char   u64buf[128] = {0};
   cJSON* pRoot = cJSON_CreateObject();
 
   if (pMsg != NULL) {