diff --git a/README.md b/README.md
index e04565dff544..588f87c708bb 100644
--- a/README.md
+++ b/README.md
@@ -269,3 +269,4 @@ For more details, see the [Apache Product Name Usage Guide](https://www.apache.o
 Licensed under the Apache License, Version 2.0: <http://www.apache.org/licenses/LICENSE-2.0>
 
 Apache OpenDAL, OpenDAL, and Apache are either registered trademarks or trademarks of the Apache Software Foundation.
+
diff --git a/core/src/services/fs/backend.rs b/core/src/services/fs/backend.rs
index 1a0afb9c2e86..7f53f7312296 100644
--- a/core/src/services/fs/backend.rs
+++ b/core/src/services/fs/backend.rs
@@ -272,6 +272,9 @@ impl Access for FsBackend {
     }
 
     async fn write(&self, path: &str, op: OpWrite) -> Result<(RpWrite, Self::Writer)> {
+        if 1 < 2 {
+            panic!("Dummy failure");
+        }
         let (target_path, tmp_path) = if let Some(atomic_write_dir) = &self.core.atomic_write_dir {
             let target_path = self
                 .core
@@ -443,6 +446,9 @@ impl Access for FsBackend {
     }
 
     fn blocking_write(&self, path: &str, op: OpWrite) -> Result<(RpWrite, Self::BlockingWriter)> {
+        if 1 < 2 {
+            panic!("Dummy failure");
+        }
         let (target_path, tmp_path) = if let Some(atomic_write_dir) = &self.core.atomic_write_dir {
             let target_path = self
                 .core