diff --git a/source/dnode/mnode/impl/src/mndScheduler.c b/source/dnode/mnode/impl/src/mndScheduler.c
index e1886511b714fa0a92b1b03d998730e606fa5042..e8428ea4700741254cabbc43dc3b4380a50f23ad 100644
--- a/source/dnode/mnode/impl/src/mndScheduler.c
+++ b/source/dnode/mnode/impl/src/mndScheduler.c
@@ -224,7 +224,7 @@ int32_t mndAddShuffleSinkTasksToStream(SMnode* pMnode, SStreamObj* pStream) {
   ASSERT(taosArrayGetSize(pStream->tasks) == 1);
 
   while (1) {
-    SVgObj* pVgroup;
+    SVgObj* pVgroup = NULL;
     pIter = sdbFetch(pSdb, SDB_VGROUP, pIter, (void**)&pVgroup);
     if (pIter == NULL) break;
     if (!mndVgroupInDb(pVgroup, pStream->targetDbUid)) {
@@ -258,6 +258,7 @@ int32_t mndAddShuffleSinkTasksToStream(SMnode* pMnode, SStreamObj* pStream) {
       pTask->tbSink.pSchemaWrapper = tCloneSSchemaWrapper(&pStream->outputSchema);
       ASSERT(pTask->tbSink.pSchemaWrapper);
     }
+    sdbRelease(pSdb, pVgroup);
   }
   return 0;
 }
@@ -382,6 +383,7 @@ int32_t mndScheduleStream(SMnode* pMnode, SStreamObj* pStream) {
             qDestroyQueryPlan(pPlan);
             return -1;
           }
+          sdbRelease(pSdb, pVgroup);
         } else {
           if (mndAssignTaskToSnode(pMnode, pInnerTask, plan, pSnode) < 0) {
             sdbRelease(pSdb, pSnode);
@@ -396,6 +398,7 @@ int32_t mndScheduleStream(SMnode* pMnode, SStreamObj* pStream) {
           qDestroyQueryPlan(pPlan);
           return -1;
         }
+        sdbRelease(pSdb, pVgroup);
       }
     }
 
@@ -459,6 +462,7 @@ int32_t mndScheduleStream(SMnode* pMnode, SStreamObj* pStream) {
       pEpInfo->nodeId = pTask->nodeId;
       pEpInfo->taskId = pTask->taskId;
       taosArrayPush(pInnerTask->childEpInfo, &pEpInfo);
+      sdbRelease(pSdb, pVgroup);
     }
   }
 
diff --git a/tests/parallel_test/cases.task b/tests/parallel_test/cases.task
index 64eca5fda636f37130f9a901b8549a1835f2866d..079dbd8d02e03d210609acbf6ede2a61197f7b9d 100644
--- a/tests/parallel_test/cases.task
+++ b/tests/parallel_test/cases.task
@@ -436,7 +436,7 @@
 ,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/table_param_ttl.py -R
 ,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/update_data_muti_rows.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/db_tb_name_check.py
-,,,system-test,python3 ./test.py -f 1-insert/database_pre_suf.py
+,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/database_pre_suf.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/InsertFuturets.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 0-others/show.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/abs.py
@@ -617,8 +617,8 @@
 ,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/delete_childtable.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/delete_normaltable.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/keep_expired.py
-,,,system-test,python3 ./test.py -f 1-insert/drop.py
-,,,system-test,python3 ./test.py -f 1-insert/drop.py -N 3 -M 3 -i False -n 3
+,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/drop.py
+,,y,system-test,./pytest.sh python3 ./test.py -f 1-insert/drop.py -N 3 -M 3 -i False -n 3
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/join2.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/union1.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/concat2.py
diff --git a/tests/pytest/util/dnodes.py b/tests/pytest/util/dnodes.py
index 22e612797328440812d22b9795c6ad74f7e3b5c0..ee091303687b7a31f2c139d2f9d79a5fae52389f 100644
--- a/tests/pytest/util/dnodes.py
+++ b/tests/pytest/util/dnodes.py
@@ -312,8 +312,14 @@ class TDDnode:
                 cmd = "mintty -h never %s -c %s" % (
                     binPath, self.cfgDir)
             else:
-                cmd = "nohup %s -c %s > /dev/null 2>&1 & " % (
-                    binPath, self.cfgDir)
+                if self.asan:
+                    asanDir = "%s/sim/asan/dnode%d.asan" % (
+                        self.path, self.index)
+                    cmd = "nohup %s -c %s > /dev/null 2> %s & " % (
+                        binPath, self.cfgDir, asanDir)
+                else:
+                    cmd = "nohup %s -c %s > /dev/null 2>&1 & " % (
+                        binPath, self.cfgDir)
         else:
             valgrindCmdline = "valgrind --log-file=\"%s/../log/valgrind.log\"  --tool=memcheck --leak-check=full --show-reachable=no --track-origins=yes --show-leak-kinds=all -v --workaround-gcc296-bugs=yes"%self.cfgDir
 
@@ -748,7 +754,7 @@ class TDDnodes:
             tdLog.exit("index:%d should on a scale of [1, 10]" % (index))
 
     def StopAllSigint(self):
-        tdLog.info("stop all dnodes sigint")
+        tdLog.info("stop all dnodes sigint, asan:%d" % self.asan)
         if self.asan:
             tdLog.info("execute script: %s" % self.stopDnodesSigintPath)
             os.system(self.stopDnodesSigintPath)
@@ -756,7 +762,7 @@ class TDDnodes:
             return
 
     def stopAll(self):
-        tdLog.info("stop all dnodes")
+        tdLog.info("stop all dnodes, asan:%d" % self.asan)
         if self.asan:
             tdLog.info("execute script: %s" % self.stopDnodesPath)
             os.system(self.stopDnodesPath)
diff --git a/tests/system-test/test.py b/tests/system-test/test.py
index cf9aba123cbc2b902dd13152a24cafd53bdbb03d..2017aad1ca7c980b2040d90e389e0101d8fd734e 100644
--- a/tests/system-test/test.py
+++ b/tests/system-test/test.py
@@ -464,6 +464,7 @@ if __name__ == "__main__":
             tdDnodes.init(deployPath, masterIp)
             tdDnodes.setTestCluster(testCluster)
             tdDnodes.setValgrind(valgrind)
+            tdDnodes.setAsan(asan)
             tdDnodes.stopAll()
             for dnode in tdDnodes.dnodes:
                 tdDnodes.deploy(dnode.index,{})