diff --git a/source/dnode/mnode/impl/src/mndVgroup.c b/source/dnode/mnode/impl/src/mndVgroup.c
index e00d0d955ec820176cb696fa652c5e7fdd374edb..9d3b86c79bfb3be454611e6532763c5865991700 100644
--- a/source/dnode/mnode/impl/src/mndVgroup.c
+++ b/source/dnode/mnode/impl/src/mndVgroup.c
@@ -1907,6 +1907,7 @@ static int32_t mndBalanceVgroup(SMnode *pMnode, SRpcMsg *pReq, SArray *pArray) {
   }
 
 _OVER:
+  taosHashCleanup(pBalancedVgroups);
   mndTransDrop(pTrans);
   return code;
 }
diff --git a/source/libs/wal/src/walMgmt.c b/source/libs/wal/src/walMgmt.c
index b78d5ca6c1c0f4573e473d78ed7d784dc2297d6b..5d0f020b02cfc62a23ffbf3de2dc656e7d150a9b 100644
--- a/source/libs/wal/src/walMgmt.c
+++ b/source/libs/wal/src/walMgmt.c
@@ -251,7 +251,7 @@ static void walFsyncAll() {
       int32_t code = taosFsyncFile(pWal->pLogFile);
       if (code != 0) {
         wError("vgId:%d, file:%" PRId64 ".log, failed to fsync since %s", pWal->cfg.vgId, walGetLastFileFirstVer(pWal),
-               strerror(code));
+               strerror(errno));
       }
     }
     pWal = taosIterateRef(tsWal.refSetId, pWal->refId);
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index b4064326169aa5ee8768e0f0823ba2c7eb0c41d4..43602a607a771d11ba15a6d46cafe830917ddeb6 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -646,7 +646,12 @@ const char* tstrerror(int32_t err) {
 
   // this is a system errno
   if ((err & 0x00ff0000) == 0x00ff0000) {
-    return strerror(err & 0x0000ffff);
+    int32_t code = err & 0x0000ffff;
+    if (code >= 0 && code < 36) {
+      return strerror(code);
+    } else {
+      return "unknown err";
+    }
   }
 
   int32_t s = 0;
diff --git a/tests/parallel_test/cases.task b/tests/parallel_test/cases.task
index 4c9715270da99b5294575e9168aef89e79e3d361..7115e122526a852909e46edfdaa1b703ecac7171 100644
--- a/tests/parallel_test/cases.task
+++ b/tests/parallel_test/cases.task
@@ -11,7 +11,7 @@
 ,,y,script,./test.sh -f tsim/user/privilege_db.sim
 ,,y,script,./test.sh -f tsim/user/privilege_sysinfo.sim
 ,,y,script,./test.sh -f tsim/db/alter_option.sim
-,,,script,./test.sh -f tsim/db/alter_replica_13.sim
+,,y,script,./test.sh -f tsim/db/alter_replica_13.sim
 ,,y,script,./test.sh -f tsim/db/alter_replica_31.sim
 ,,y,script,./test.sh -f tsim/db/basic1.sim
 ,,y,script,./test.sh -f tsim/db/basic2.sim