--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -652,9 +652,12 @@ static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
 	p = f2fs_lookup_rb_tree_for_insert(sbi, &et->root, &parent,
 						ei->fofs, &leftmost);
 do_insert:
+	if (!mutex_trylock(&eti->extent_tree_lock))
+		return NULL;
+
 	en = __attach_extent_node(sbi, et, ei, parent, p, leftmost);
 	if (!en)
-		return NULL;
+		goto out;
 
 	__try_update_largest_extent(et, en);
 
@@ -663,6 +666,8 @@ static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
 	list_add_tail(&en->list, &eti->extent_list);
 	et->cached_en = en;
 	spin_unlock(&eti->extent_lock);
+out:
+	mutex_unlock(&eti->extent_tree_lock);
 	return en;
 }