diff --git a/source/libs/catalog/src/catalog.c b/source/libs/catalog/src/catalog.c
index bc1462176a..2e16b0968a 100644
--- a/source/libs/catalog/src/catalog.c
+++ b/source/libs/catalog/src/catalog.c
@@ -1986,10 +1986,19 @@ void catalogDestroy(void) {
   }
 
   if (gCtgMgmt.cacheTimer) {
-    if (taosTmrStop(gCtgMgmt.cacheTimer)) {
-      qTrace("stop catalog cache timer may failed");
+    if (!taosTmrStop(gCtgMgmt.cacheTimer)) {
+/*
+      qDebug("catalog cacheTimer %" PRIuPTR " not stopped", (uintptr_t)gCtgMgmt.cacheTimer);
+    
+      while (!taosTmrIsStopped(&gCtgMgmt.cacheTimer)) {
+        taosMsleep(1);
+      }
+*/
     }
+
+    qDebug("catalog cacheTimer %" PRIuPTR " is stopped", (uintptr_t)gCtgMgmt.cacheTimer);
     gCtgMgmt.cacheTimer = NULL;
+    
     taosTmrCleanUp(gCtgMgmt.timer);
     gCtgMgmt.timer = NULL;
   }
diff --git a/source/libs/catalog/src/ctgDbg.c b/source/libs/catalog/src/ctgDbg.c
index f3a0b04457..a1512f8fd9 100644
--- a/source/libs/catalog/src/ctgDbg.c
+++ b/source/libs/catalog/src/ctgDbg.c
@@ -480,6 +480,8 @@ void ctgdShowDBCache(SCatalog *pCtg, SHashObj *dbHash) {
 
     dbCache = (SCtgDBCache *)pIter;
 
+    CTG_LOCK(CTG_READ, &dbCache->dbLock);
+
     dbFName = taosHashGetKey(pIter, &len);
 
     int32_t metaNum = dbCache->tbCache ? taosHashGetSize(dbCache->tbCache) : 0;
@@ -509,6 +511,8 @@ void ctgdShowDBCache(SCatalog *pCtg, SHashObj *dbHash) {
              hashMethod, hashPrefix, hashSuffix, vgNum);
 
     if (dbCache->vgCache.vgInfo) {
+      CTG_LOCK(CTG_READ, &dbCache->vgCache.vgLock);
+
       int32_t i = 0;
       void *pVgIter = taosHashIterate(dbCache->vgCache.vgInfo->vgHash, NULL);
       while (pVgIter) {
@@ -524,6 +528,8 @@ void ctgdShowDBCache(SCatalog *pCtg, SHashObj *dbHash) {
         
         pVgIter = taosHashIterate(dbCache->vgCache.vgInfo->vgHash, pVgIter);      
       }
+
+      CTG_UNLOCK(CTG_READ, &dbCache->vgCache.vgLock);
     }
 
     if (dbCache->cfgCache.cfgInfo) {
@@ -544,6 +550,8 @@ void ctgdShowDBCache(SCatalog *pCtg, SHashObj *dbHash) {
                pCfg->schemaless, pCfg->sstTrigger);
     }
 
+    CTG_UNLOCK(CTG_READ, &dbCache->dbLock);
+
     ++i;
     pIter = taosHashIterate(dbHash, pIter);
   }
diff --git a/source/libs/catalog/test/catalogTests.cpp b/source/libs/catalog/test/catalogTests.cpp
index c2889f096b..06eabc09da 100644
--- a/source/libs/catalog/test/catalogTests.cpp
+++ b/source/libs/catalog/test/catalogTests.cpp
@@ -149,12 +149,13 @@ void ctgTestInitLogFile() {
     return;
   }
 
-  const char   *defaultLogFileNamePrefix = "taoslog";
+  const char   *defaultLogFileNamePrefix = "catalogTest";
   const int32_t maxLogFileNum = 10;
 
   tsAsyncLog = 0;
   qDebugFlag = 159;
   tmrDebugFlag = 159;
+  tsNumOfLogLines = 1000000000;
   TAOS_STRCPY(tsLogDir, TD_LOG_DIR_PATH);
 
   (void)ctgdEnableDebug("api", true);
@@ -1839,7 +1840,7 @@ TEST(tableMeta, updateStbMeta) {
   while (true) {
     uint64_t n = 0;
     ASSERT(0 == ctgdGetStatNum("runtime.numOfOpDequeue", (void *)&n));
-    if (n != 3) {
+    if (n < 3) {
       taosMsleep(50);
     } else {
       break;