diff --git a/kernel/model/file.go b/kernel/model/file.go
index f409586ad..354bf5219 100644
--- a/kernel/model/file.go
+++ b/kernel/model/file.go
@@ -918,9 +918,12 @@ func loadNodesByMode(node *ast.Node, inputIndex, mode, size int, isDoc, isHeadin
 }
 
 func writeJSONQueue(tree *parse.Tree) (err error) {
+	writingDataLock.Lock()
 	if err = filesys.WriteTree(tree); nil != err {
+		writingDataLock.Unlock()
 		return
 	}
+	writingDataLock.Unlock()
 	sql.UpsertTreeQueue(tree)
 	return
 }
@@ -931,9 +934,12 @@ func indexWriteJSONQueue(tree *parse.Tree) (err error) {
 }
 
 func renameWriteJSONQueue(tree *parse.Tree, oldHPath string) (err error) {
+	writingDataLock.Unlock()
 	if err = filesys.WriteTree(tree); nil != err {
+		writingDataLock.Unlock()
 		return
 	}
+	writingDataLock.Unlock()
 	sql.RenameTreeQueue(tree, oldHPath)
 	treenode.ReindexBlockTree(tree)
 	return
diff --git a/kernel/model/sync.go b/kernel/model/sync.go
index 0133d5f64..bb6abf522 100644
--- a/kernel/model/sync.go
+++ b/kernel/model/sync.go
@@ -63,6 +63,9 @@ func SyncData(boot, exit, byHand bool) {
 		return
 	}
 
+	writingDataLock.Lock()
+	defer writingDataLock.Unlock()
+
 	if util.IsMutexLocked(&syncLock) {
 		logging.LogWarnf("sync is in progress")
 		planSyncAfter(30 * time.Second)
diff --git a/kernel/model/transaction.go b/kernel/model/transaction.go
index b98d322b4..44c81c175 100644
--- a/kernel/model/transaction.go
+++ b/kernel/model/transaction.go
@@ -110,9 +110,12 @@ func AutoFlushTx() {
 	}
 }
 
+var txLock = sync.Mutex{}
+
 func flushTx() {
-	writingDataLock.Lock()
-	defer writingDataLock.Unlock()
+	txLock.Lock()
+	defer txLock.Unlock()
+
 	defer logging.Recover()
 
 	currentTx = mergeTx()
diff --git a/kernel/model/upload.go b/kernel/model/upload.go
index a327cbc67..75f0dcdaa 100644
--- a/kernel/model/upload.go
+++ b/kernel/model/upload.go
@@ -34,6 +34,9 @@ import (
 )
 
 func InsertLocalAssets(id string, assetPaths []string) (succMap map[string]interface{}, err error) {
+	writingDataLock.Lock()
+	defer writingDataLock.Unlock()
+
 	succMap = map[string]interface{}{}
 
 	bt := treenode.GetBlockTree(id)
@@ -101,6 +104,9 @@ func Upload(c *gin.Context) {
 	ret := gulu.Ret.NewResult()
 	defer c.JSON(200, ret)
 
+	writingDataLock.Lock()
+	defer writingDataLock.Unlock()
+
 	form, err := c.MultipartForm()
 	if nil != err {
 		logging.LogErrorf("insert asset failed: %s", err)