diff --git a/source/libs/stream/src/streamTask.c b/source/libs/stream/src/streamTask.c
index afe315bf58..76db09731f 100644
--- a/source/libs/stream/src/streamTask.c
+++ b/source/libs/stream/src/streamTask.c
@@ -310,6 +310,7 @@ void tFreeStreamTask(SStreamTask* pTask) {
 }
 
 void streamFreeTaskState(SStreamTask* pTask, int8_t remove) {
+  stDebug("s-task:0x%x start to free task state/backend", pTask->id.taskId);
   if (pTask->pState != NULL) {
     stDebug("s-task:0x%x start to free task state", pTask->id.taskId);
     streamStateClose(pTask->pState, remove);
@@ -319,8 +320,11 @@ void streamFreeTaskState(SStreamTask* pTask, int8_t remove) {
     pTask->pBackend = NULL;
     pTask->pState = NULL;
   } else {
+    stDebug("s-task:0x%x task state is NULL, may del backend:%s", pTask->id.taskId,
+            pTask->backendPath ? pTask->backendPath : "NULL");
     if (remove) {
       if (pTask->backendPath != NULL) {
+        stDebug("s-task:0x%x task state is NULL, do del backend:%s", pTask->id.taskId, pTask->backendPath);
         taosRemoveDir(pTask->backendPath);
       }
     }
@@ -393,6 +397,7 @@ int32_t streamTaskSetBackendPath(SStreamTask* pTask) {
   }
 
   (void)sprintf(pTask->backendPath, "%s%s%s", pTask->pMeta->path, TD_DIRSEP, id);
+  stDebug("s-task:%s set backend path:%s", pTask->id.idStr, pTask->backendPath);
 
   return 0;
 }