[TD-374] fix invalid read

src/mnode/src/mgmtVgroup.c

@@ -130,6 +130,7 @@ static void mgmtVgroupUpdateIdPool(SVgObj *pVgroup) {
       taosUpdateIdPool(pVgroup->idPool, pDb->cfg.maxTables);
       int32_t size = sizeof(SChildTableObj *) * pDb->cfg.maxTables;
       pVgroup->tableList = (SChildTableObj **)realloc(pVgroup->tableList, size);
+      memset(pVgroup->tableList + oldTables, 0, (pDb->cfg.maxTables - oldTables) * sizeof(SChildTableObj **));
     }
   }
 }

src/vnode/src/vnodeMain.c

@@ -239,6 +239,10 @@ int32_t vnodeOpen(int32_t vnode, char *rootDir) {
   syncInfo.notifyFileSynced = vnodeNotifyFileSynced;
   pVnode->sync = syncStart(&syncInfo);
 
+#ifndef _SYNC
+  pVnode->role = TAOS_SYNC_ROLE_MASTER;
+#endif
+
   // start continuous query
   if (pVnode->role == TAOS_SYNC_ROLE_MASTER) 
     cqStart(pVnode->cq);