diff --git a/source/dnode/vnode/src/tsdb/tsdbFS2.c b/source/dnode/vnode/src/tsdb/tsdbFS2.c
index 1a0104945fa52c33d06be198501b97510ca481c9..6e7595c6ef29791811b23ce6d4a617ec077b6958 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFS2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbFS2.c
@@ -537,6 +537,9 @@ static void tsdbDoWaitBgTask(STFileSystem *fs, STFSBgTask *task) {
 
   if (task->numWait == 0) {
     taosThreadCondDestroy(task->done);
+    if (task->free) {
+      task->free(task->arg);
+    }
     taosMemoryFree(task);
   }
 }
@@ -546,6 +549,9 @@ static void tsdbDoDoneBgTask(STFileSystem *fs, STFSBgTask *task) {
     taosThreadCondBroadcast(task->done);
   } else {
     taosThreadCondDestroy(task->done);
+    if (task->free) {
+      task->free(task->arg);
+    }
     taosMemoryFree(task);
   }
 }
@@ -627,7 +633,7 @@ int32_t tsdbFSEditCommit(STFileSystem *fs) {
       SSttLvl *lvl = TARRAY2_FIRST(fset->lvlArr);
       if (lvl->level != 0 || TARRAY2_SIZE(lvl->fobjArr) < fs->tsdb->pVnode->config.sttTrigger) continue;
 
-      code = tsdbFSScheduleBgTask(fs, TSDB_BG_TASK_MERGER, tsdbMerge, fs->tsdb, NULL);
+      code = tsdbFSScheduleBgTask(fs, TSDB_BG_TASK_MERGER, tsdbMerge, NULL, fs->tsdb, NULL);
       TSDB_CHECK_CODE(code, lino, _exit);
 
       break;
@@ -774,8 +780,8 @@ static int32_t tsdbFSRunBgTask(void *arg) {
   return 0;
 }
 
-static int32_t tsdbFSScheduleBgTaskImpl(STFileSystem *fs, EFSBgTaskT type, int32_t (*run)(void *), void *arg,
-                                        int64_t *taskid) {
+static int32_t tsdbFSScheduleBgTaskImpl(STFileSystem *fs, EFSBgTaskT type, int32_t (*run)(void *), void (*free)(void *),
+                                        void *arg, int64_t *taskid) {
   if (fs->stop) {
     return 0;  // TODO: use a better error code
   }
@@ -798,6 +804,7 @@ static int32_t tsdbFSScheduleBgTaskImpl(STFileSystem *fs, EFSBgTaskT type, int32
 
   task->type = type;
   task->run = run;
+  task->free = free;
   task->arg = arg;
   task->scheduleTime = taosGetTimestampMs();
   task->taskid = ++fs->taskid;
@@ -819,9 +826,10 @@ static int32_t tsdbFSScheduleBgTaskImpl(STFileSystem *fs, EFSBgTaskT type, int32
   return 0;
 }
 
-int32_t tsdbFSScheduleBgTask(STFileSystem *fs, EFSBgTaskT type, int32_t (*run)(void *), void *arg, int64_t *taskid) {
+int32_t tsdbFSScheduleBgTask(STFileSystem *fs, EFSBgTaskT type, int32_t (*run)(void *), void (*free)(void *), void *arg,
+                             int64_t *taskid) {
   taosThreadMutexLock(fs->mutex);
-  int32_t code = tsdbFSScheduleBgTaskImpl(fs, type, run, arg, taskid);
+  int32_t code = tsdbFSScheduleBgTaskImpl(fs, type, run, free, arg, taskid);
   taosThreadMutexUnlock(fs->mutex);
   return code;
 }
diff --git a/source/dnode/vnode/src/tsdb/tsdbFS2.h b/source/dnode/vnode/src/tsdb/tsdbFS2.h
index 8270581e58e23468fb1f6e782fc1015c27b2e71c..e814ab2fffb2a49b76fa2642efd309db0ddd7f2b 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFS2.h
+++ b/source/dnode/vnode/src/tsdb/tsdbFS2.h
@@ -59,7 +59,8 @@ int32_t tsdbFSEditBegin(STFileSystem *fs, const TFileOpArray *opArray, EFEditT e
 int32_t tsdbFSEditCommit(STFileSystem *fs);
 int32_t tsdbFSEditAbort(STFileSystem *fs);
 // background task
-int32_t tsdbFSScheduleBgTask(STFileSystem *fs, EFSBgTaskT type, int32_t (*run)(void *), void *arg, int64_t *taskid);
+int32_t tsdbFSScheduleBgTask(STFileSystem *fs, EFSBgTaskT type, int32_t (*run)(void *), void (*free)(void *), void *arg,
+                             int64_t *taskid);
 int32_t tsdbFSWaitBgTask(STFileSystem *fs, int64_t taskid);
 int32_t tsdbFSWaitAllBgTask(STFileSystem *fs);
 int32_t tsdbFSDisableBgTask(STFileSystem *fs);
@@ -70,6 +71,7 @@ int32_t tsdbFSGetFSet(STFileSystem *fs, int32_t fid, STFileSet **fset);
 struct STFSBgTask {
   EFSBgTaskT type;
   int32_t (*run)(void *arg);
+  void (*free)(void *arg);
   void *arg;
 
   TdThreadCond done[1];
diff --git a/source/dnode/vnode/src/tsdb/tsdbRetention.c b/source/dnode/vnode/src/tsdb/tsdbRetention.c
index ae5ac4ae3647012c39a20d9bee4cade563899b7a..043de33728053b8cbf77d009e94abb8dd07b56c2 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRetention.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRetention.c
@@ -251,7 +251,6 @@ _exit:
   if (code) {
     TSDB_ERROR_LOG(TD_VID(rtner->tsdb->pVnode), lino, code);
   }
-  taosMemoryFree(arg);
   return code;
 }
 
@@ -262,9 +261,8 @@ int32_t tsdbAsyncRetention(STsdb *tsdb, int64_t now, int64_t *taskid) {
   arg->tsdb = tsdb;
   arg->now = now;
 
-  int32_t code = tsdbFSScheduleBgTask(tsdb->pFS, TSDB_BG_TASK_RETENTION, tsdbDoRetention2, arg, taskid);
+  int32_t code = tsdbFSScheduleBgTask(tsdb->pFS, TSDB_BG_TASK_RETENTION, tsdbDoRetention2, taosMemoryFree, arg, taskid);
   if (code) taosMemoryFree(arg);
-
   return code;
 }