diff --git a/src/util/inc/tstoken.h b/src/util/inc/tstoken.h
index 60a79f69afe8b7521e1869eea8ae0e96f4660487..74687e9c18ada622fadb87ab5e5f0abf22f1580f 100644
--- a/src/util/inc/tstoken.h
+++ b/src/util/inc/tstoken.h
@@ -120,6 +120,7 @@ static FORCE_INLINE int32_t isValidNumber(const SSQLToken* pToken) {
 
         type = TK_FLOAT;
         goto _end;
+        break;
       }
 
       case '0': {
diff --git a/src/util/src/tarray.c b/src/util/src/tarray.c
index b99e722262288014b4eb4cae8252235a2205c099..19225e998a1b2a5fead58b781b448ccf4b604415 100755
--- a/src/util/src/tarray.c
+++ b/src/util/src/tarray.c
@@ -95,9 +95,6 @@ void* taosArrayGetP(const SArray* pArray, size_t index) {
   assert(index < pArray->size);
   
   void* d = TARRAY_GET_ELEM(pArray, index);
-  if (d == NULL) {
-    return NULL;
-  }
   
   return *(void**)d;
 }
diff --git a/src/util/src/tcache.c b/src/util/src/tcache.c
index 2b6083a91ccef8ef2a08902117e8f67340ba6a37..7aaa5b91db0f59cc7516b15051ba046153e0d135 100644
--- a/src/util/src/tcache.c
+++ b/src/util/src/tcache.c
@@ -119,7 +119,7 @@ static FORCE_INLINE void taosCacheReleaseNode(SCacheObj *pCacheObj, SCacheDataNo
   int32_t size = pNode->size;
   taosHashRemove(pCacheObj->pHashTable, pNode->key, pNode->keySize);
   
-  uTrace("key:%s is removed from cache,total:%d,size:%ldbytes", pNode->key, pCacheObj->totalSize, size);  
+  uTrace("key:%s is removed from cache,total:%" PRId64 ",size:%dbytes", pNode->key, pCacheObj->totalSize, size);  
   if (pCacheObj->freeFp) pCacheObj->freeFp(pNode->data);
   free(pNode);
 }
@@ -288,7 +288,7 @@ void *taosCachePut(SCacheObj *pCacheObj, const char *key, const void *pData, siz
     if (NULL != pNode) {
       pCacheObj->totalSize += pNode->size;
       
-      uTrace("key:%s %p added into cache, added:%" PRIu64 ", expire:%" PRIu64 ", total:%d, size:%" PRId64 " bytes",
+      uTrace("key:%s %p added into cache, added:%" PRIu64 ", expire:%" PRIu64 ", total:%" PRId64 ", size:%" PRId64 " bytes",
              key, pNode, pNode->addedTime, pNode->expiredTime, pCacheObj->totalSize, dataSize);
     } else {
       uError("key:%s failed to added into cache, out of memory", key);
@@ -433,7 +433,6 @@ void taosCacheEmpty(SCacheObj *pCacheObj) {
   __cache_wr_lock(pCacheObj);
   while (taosHashIterNext(pIter)) {
     if (pCacheObj->deleting == 1) {
-      taosHashDestroyIter(pIter);
       break;
     }
     
@@ -507,7 +506,7 @@ void taosAddToTrash(SCacheObj *pCacheObj, SCacheDataNode *pNode) {
 
 void taosRemoveFromTrashCan(SCacheObj *pCacheObj, STrashElem *pElem) {
   if (pElem->pData->signature != (uint64_t)pElem->pData) {
-    uError("key:sig:%d %p data has been released, ignore", pElem->pData->signature, pElem->pData);
+    uError("key:sig:0x%x %p data has been released, ignore", pElem->pData->signature, pElem->pData);
     return;
   }
 
@@ -561,7 +560,6 @@ void taosTrashCanEmpty(SCacheObj *pCacheObj, bool force) {
     }
   }
 
-  assert(pCacheObj->numOfElemsInTrash >= 0);
   __cache_unlock(pCacheObj);
 }
 
diff --git a/src/util/src/tcompression.c b/src/util/src/tcompression.c
index e3b3d65052e4d34c9c424b565d084ae123efcac0..b085e26e07177189d2b7d350a82ef779576d3cf2 100644
--- a/src/util/src/tcompression.c
+++ b/src/util/src/tcompression.c
@@ -551,7 +551,7 @@ int tsDecompressTimestampImp(const char *const input, const int nelements, char
         delta_of_delta = 0;
       } else {
         if (is_bigendian()) {
-          memcpy(&dd1 + LONG_BYTES - nbytes, input + ipos, nbytes);
+          memcpy(((char *)(&dd1)) + LONG_BYTES - nbytes, input + ipos, nbytes);
         } else {
           memcpy(&dd1, input + ipos, nbytes);
         }
@@ -576,7 +576,7 @@ int tsDecompressTimestampImp(const char *const input, const int nelements, char
         delta_of_delta = 0;
       } else {
         if (is_bigendian()) {
-          memcpy(&dd2 + LONG_BYTES - nbytes, input + ipos, nbytes);
+          memcpy(((char *)(&dd2)) + LONG_BYTES - nbytes, input + ipos, nbytes);
         } else {
           memcpy(&dd2, input + ipos, nbytes);
         }
diff --git a/src/util/src/tconfig.c b/src/util/src/tconfig.c
index 543a84dc44cf3105aee4583bc31882df37702fad..2288035fc7a67edcc11995b69253afbf6fe465c7 100644
--- a/src/util/src/tconfig.c
+++ b/src/util/src/tconfig.c
@@ -74,7 +74,7 @@ static void taosReadInt32Config(SGlobalCfg *cfg, char *input_value) {
       *option = value;
       cfg->cfgStatus = TAOS_CFG_CSTATUS_FILE;
     } else {
-      uWarn("config option:%s, input value:%s, is configured by %s, use %s", cfg->option, input_value,
+      uWarn("config option:%s, input value:%s, is configured by %s, use %d", cfg->option, input_value,
             tsCfgStatusStr[cfg->cfgStatus], *option);
     }
   }
@@ -106,7 +106,11 @@ static void taosReadDirectoryConfig(SGlobalCfg *cfg, char *input_value) {
   } else {
     if (cfg->cfgStatus <= TAOS_CFG_CSTATUS_FILE) {
       wordexp_t full_path;
-      wordexp(input_value, &full_path, 0);
+      if (0 != wordexp(input_value, &full_path, 0)) {
+        printf("\nconfig dir: %s wordexp fail! reason:%s\n", input_value, strerror(errno));
+        wordfree(&full_path);
+        return;
+      }
       if (full_path.we_wordv != NULL && full_path.we_wordv[0] != NULL) {
         strcpy(option, full_path.we_wordv[0]);
       }
@@ -240,7 +244,12 @@ void taosReadGlobalLogCfg() {
   sdbDebugFlag = 135;
 
   wordexp_t full_path;
-  wordexp(configDir, &full_path, 0);
+  if ( 0 != wordexp(configDir, &full_path, 0)) {
+    printf("\nconfig file: %s wordexp fail! reason:%s\n", configDir, strerror(errno));
+    wordfree(&full_path);
+    return;
+  }
+  
   if (full_path.we_wordv != NULL && full_path.we_wordv[0] != NULL) {    
     if (strlen(full_path.we_wordv[0]) >= TSDB_FILENAME_LEN) {
       printf("\nconfig file: %s path overflow max len %d, all variables are set to default\n", full_path.we_wordv[0], TSDB_FILENAME_LEN - 1);
diff --git a/src/util/src/tkvstore.c b/src/util/src/tkvstore.c
index 88cd446349a351da7855d7fcdfcd2291c830381f..cf5228c072511db29e2d4794c35d1fe2104f1463 100644
--- a/src/util/src/tkvstore.c
+++ b/src/util/src/tkvstore.c
@@ -537,5 +537,6 @@ static int tdRestoreKVStore(SKVStore *pStore) {
 
 _err:
   tfree(buf);
+  taosHashDestroyIter(pIter);
   return -1;
 }
\ No newline at end of file
diff --git a/src/util/src/tlog.c b/src/util/src/tlog.c
index 01a0eabbca39258951f2e0d6c4e098c7bf009be8..d1fb287184d85a4e6c7c68aa972e7ea39b75614c 100644
--- a/src/util/src/tlog.c
+++ b/src/util/src/tlog.c
@@ -142,6 +142,10 @@ static void *taosThreadToOpenNewFile(void *param) {
   umask(0);
 
   int32_t fd = open(name, O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU | S_IRWXG | S_IRWXO);
+  if (fd < 0) {
+    uError("open new log file fail! fd:%d reason:%s", fd, strerror(errno));
+    return NULL;
+  }
   taosLockFile(fd);
   lseek(fd, 0, SEEK_SET);
 
@@ -184,7 +188,7 @@ void taosResetLog() {
   tsLogObj.lines = tsLogObj.maxLines + 10;
 
   taosOpenNewLogFile();
-  remove(lastName);
+  (void)remove(lastName);
 
   uPrint("==================================");
   uPrint("   reset log file ");
@@ -279,7 +283,10 @@ static int32_t taosOpenLogFile(char *fn, int32_t maxLines, int32_t maxFileNum) {
 
   // only an estimate for number of lines
   struct stat filestat;
-  fstat(tsLogObj.logHandle->fd, &filestat);
+  if (fstat(tsLogObj.logHandle->fd, &filestat) < 0) {
+    printf("\nfailed to fstat log file:%s, reason:%s\n", name, strerror(errno));
+    return -1;
+  }
   size = (int32_t)filestat.st_size;
   tsLogObj.lines = size / 60;
 
diff --git a/src/util/src/tnote.c b/src/util/src/tnote.c
index 31ed6e2f7bded579b75066e590c68b8bc8580a3e..5bb120d4c6bfe49fe2ebd16949c5633b6d6d218d 100644
--- a/src/util/src/tnote.c
+++ b/src/util/src/tnote.c
@@ -214,7 +214,10 @@ int taosOpenNoteWithMaxLines(char *fn, int maxLines, int maxNoteNum, taosNoteInf
 
     // only an estimate for number of lines
     struct stat filestat;
-    fstat(pNote->taosNoteFd, &filestat);
+    if (fstat(pNote->taosNoteFd, &filestat) < 0) {
+      fprintf(stderr, "failed to fstat note file:%s reason:%s\n", name, strerror(errno));
+      return -1;
+    }    
     size = (int)filestat.st_size;
     pNote->taosNoteLines = size / 60;
 
@@ -226,7 +229,7 @@ int taosOpenNoteWithMaxLines(char *fn, int maxLines, int maxNoteNum, taosNoteInf
 void taosNotePrint(taosNoteInfo * pNote, const char * const format, ...)
 {
     va_list argpointer;
-    char    buffer[MAX_NOTE_LINE_SIZE];
+    char    buffer[MAX_NOTE_LINE_SIZE+2];
     int     len;
     struct  tm      Tm, *ptm;
     struct  timeval timeSecs;
diff --git a/src/util/src/tsocket.c b/src/util/src/tsocket.c
index 1f4d57115b2758b9144863a44f0fc49da2c14142..98ed8d1ed761dfc7ec66f66070bf7a5f63871d18 100644
--- a/src/util/src/tsocket.c
+++ b/src/util/src/tsocket.c
@@ -278,7 +278,7 @@ int taosOpenUdpSocket(uint32_t ip, uint16_t port) {
   /* bind socket to local address */
   if (bind(sockFd, (struct sockaddr *)&localAddr, sizeof(localAddr)) < 0) {
     uError("failed to bind udp socket: %d (%s), 0x%x:%hu", errno, strerror(errno), ip, port);
-    taosCloseSocket(sockFd);
+    close(sockFd);
     return -1;
   }
 
@@ -321,7 +321,7 @@ int taosOpenTcpClientSocket(uint32_t destIp, uint16_t destPort, uint32_t clientI
 
   if (ret != 0) {
     //uError("failed to connect socket, ip:0x%x, port:%hu(%s)", destIp, destPort, strerror(errno));
-    taosCloseSocket(sockFd);
+    close(sockFd);
     sockFd = -1;
   }
 
diff --git a/src/util/src/ttime.c b/src/util/src/ttime.c
index 4dd6360752f4fa67d5269c67589b2b35cbd32b4a..02d72dd1f4539a012bf50b46f94b4a7647d73675 100644
--- a/src/util/src/ttime.c
+++ b/src/util/src/ttime.c
@@ -72,49 +72,6 @@ void deltaToUtcInitOnce() {
   return;
 }
 
-int64_t user_mktime(struct tm * tm)
-{
-#define TAOS_MINUTE   60
-#define TAOS_HOUR     (60*TAOS_MINUTE)
-#define TAOS_DAY      (24*TAOS_HOUR)
-#define TAOS_YEAR     (365*TAOS_DAY)
-  
-static int month[12] = {
-  0,
-  TAOS_DAY*(31),
-  TAOS_DAY*(31+29),
-  TAOS_DAY*(31+29+31),
-  TAOS_DAY*(31+29+31+30),
-  TAOS_DAY*(31+29+31+30+31),
-  TAOS_DAY*(31+29+31+30+31+30),
-  TAOS_DAY*(31+29+31+30+31+30+31),
-  TAOS_DAY*(31+29+31+30+31+30+31+31),
-  TAOS_DAY*(31+29+31+30+31+30+31+31+30),
-  TAOS_DAY*(31+29+31+30+31+30+31+31+30+31),
-  TAOS_DAY*(31+29+31+30+31+30+31+31+30+31+30)
-};
-
-  int64_t res;
-  int     year;
-  
-  year= tm->tm_year - 70; 
-  res= TAOS_YEAR*year + TAOS_DAY*((year+1)/4);
-  res+= month[tm->tm_mon];
-  
-  if(tm->tm_mon > 1 && ((year+2)%4)) {  
-    res-= TAOS_DAY;
-  }
-  
-  res+= TAOS_DAY*(tm->tm_mday-1);  
-  res+= TAOS_HOUR*tm->tm_hour;  
-  res+= TAOS_MINUTE*tm->tm_min;  
-  res+= tm->tm_sec;
-  
-  return res + m_deltaUtc;
-
-}
-
-
 static int64_t parseFraction(char* str, char** end, int32_t timePrec);
 static int32_t parseTimeWithTz(char* timestr, int64_t* time, int32_t timePrec);
 static int32_t parseLocaltime(char* timestr, int64_t* time, int32_t timePrec);
diff --git a/src/util/src/ttimer.c b/src/util/src/ttimer.c
index cdb2c6c0beb5ea0223fb077dde20c08a5966a294..f7acc1132de674e7a33cc4e1c3de4c786c3c1612 100644
--- a/src/util/src/ttimer.c
+++ b/src/util/src/ttimer.c
@@ -139,7 +139,7 @@ static void unlockTimerList(timer_list_t* list) {
   int64_t tid = taosGetPthreadId();
   if (atomic_val_compare_exchange_64(&(list->lockedBy), tid, 0) != tid) {
     assert(false);
-    tmrError("%d trying to unlock a timer list not locked by current thread.", tid);
+    tmrError("%" PRId64 " trying to unlock a timer list not locked by current thread.", tid);
   }
 }
 
@@ -290,6 +290,7 @@ static void addToExpired(tmr_obj_t* head) {
     SSchedMsg  schedMsg;
     schedMsg.fp = NULL;
     schedMsg.tfp = processExpiredTimer;
+    schedMsg.msg = NULL;
     schedMsg.ahandle = head;
     schedMsg.thandle = NULL;
     taosScheduleTask(tmrQhandle, &schedMsg);
@@ -513,14 +514,17 @@ static void taosTmrModuleInit(void) {
       tmrError("failed to create the mutex for wheel, reason:%s", strerror(errno));
       return;
     }
+    pthread_mutex_lock(&wheel->mutex);
     wheel->nextScanAt = now + wheel->resolution;
     wheel->index = 0;
     wheel->slots = (tmr_obj_t**)calloc(wheel->size, sizeof(tmr_obj_t*));
     if (wheel->slots == NULL) {
       tmrError("failed to allocate wheel slots");
+      pthread_mutex_unlock(&wheel->mutex);
       return;
     }
     timerMap.size += wheel->size;
+    pthread_mutex_unlock(&wheel->mutex);
   }
 
   timerMap.count = 0;
diff --git a/src/util/src/tutil.c b/src/util/src/tutil.c
index 92091174153d6645474f906d3cdb09243db4455f..3b92cf21ee88003c48ee1e91587cac36ec17dcfd 100644
--- a/src/util/src/tutil.c
+++ b/src/util/src/tutil.c
@@ -557,7 +557,7 @@ bool taosGetVersionNumber(char *versionStr, int *versionNubmer) {
     return false;
   }
 
-  int versionNumberPos[4] = {0};
+  int versionNumberPos[5] = {0};
   int len = strlen(versionStr);
   int dot = 0;
   for (int pos = 0; pos < len && dot < 4; ++pos) {
@@ -709,7 +709,7 @@ void taosRemoveDir(char *rootDir) {
     if (de->d_type & DT_DIR) {
       taosRemoveDir(filename);
     } else {
-      remove(filename);
+      (void)remove(filename);
       uPrint("file:%s is removed", filename);
     }
   }