From 2bb23bf6d193d0146d2e41aa4358bed8f91740c2 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Thu, 6 Jul 2023 11:15:24 +0800
Subject: [PATCH 01/13] test: add fuzz target for fs reader

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 core/fuzz/.gitignore                     |    5 +
 core/fuzz/Cargo.lock                     | 1917 ++++++++++++++++++++++
 core/fuzz/Cargo.toml                     |   32 +
 core/fuzz/README.md                      |   27 +
 core/fuzz/fuzz_targets/fuzz_reader_fs.rs |  103 ++
 5 files changed, 2084 insertions(+)
 create mode 100644 core/fuzz/.gitignore
 create mode 100644 core/fuzz/Cargo.lock
 create mode 100644 core/fuzz/Cargo.toml
 create mode 100644 core/fuzz/README.md
 create mode 100644 core/fuzz/fuzz_targets/fuzz_reader_fs.rs

diff --git a/core/fuzz/.gitignore b/core/fuzz/.gitignore
new file mode 100644
index 00000000000..8245cf2ebb4
--- /dev/null
+++ b/core/fuzz/.gitignore
@@ -0,0 +1,5 @@
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\ No newline at end of file
diff --git a/core/fuzz/Cargo.lock b/core/fuzz/Cargo.lock
new file mode 100644
index 00000000000..15b86f81c0b
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+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.48.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05d4b17490f70499f20b9e791dcf6a299785ce8af4d709018206dc5b4953e95f"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+
+[[package]]
+name = "winreg"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
diff --git a/core/fuzz/Cargo.toml b/core/fuzz/Cargo.toml
new file mode 100644
index 00000000000..332be936701
--- /dev/null
+++ b/core/fuzz/Cargo.toml
@@ -0,0 +1,32 @@
+[package]
+name = "opendal-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+anyhow = "1.0.71"
+arbitrary = { version = "1.3.0", features = ["derive"] }
+libfuzzer-sys = "0.4"
+tokio = { version = "1", features = ["full"] }
+uuid = { version = "1.4.0", features = ["v4"] }
+
+
+[dependencies.opendal]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[profile.release]
+debug = 1
+
+[[bin]]
+name = "fuzz_reader_fs"
+path = "fuzz_targets/fuzz_reader_fs.rs"
+test = false
+doc = false
diff --git a/core/fuzz/README.md b/core/fuzz/README.md
new file mode 100644
index 00000000000..a2382265613
--- /dev/null
+++ b/core/fuzz/README.md
@@ -0,0 +1,27 @@
+# Fuzz Test for OpenDAL
+
+fuzz test are used to test the robustness of the code. 
+
+## Setup
+
+To run the fuzz tests, you need to switch your rust version to nightly. You can do this by running the following command:
+
+```bash
+rustup override set nightly
+```
+
+## Run
+
+List all fuzz targets.
+
+```bash
+cargo fuzz list
+```
+
+Run a fuzz target(such as `fs` `reader`).
+
+```bash
+cargo fuzz run fuzz_reader_fs
+```
+
+For more details, please visit [cargo fuzz](https://rust-fuzz.github.io/book/cargo-fuzz/tutorial.html) or run the command cargo fuzz --help.
\ No newline at end of file
diff --git a/core/fuzz/fuzz_targets/fuzz_reader_fs.rs b/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
new file mode 100644
index 00000000000..b6c6d6679d2
--- /dev/null
+++ b/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
@@ -0,0 +1,103 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#![no_main]
+
+use libfuzzer_sys::arbitrary::{Arbitrary, Result, Unstructured};
+use libfuzzer_sys::fuzz_target;
+use opendal::raw::oio::ReadExt;
+use opendal::{services, Operator};
+use std::env;
+
+#[derive(Debug)]
+enum ReaderAction {
+    Read { size: usize },
+    Seek { offset: usize },
+    Next,
+}
+
+#[derive(Debug)]
+struct FuzzInput {
+    actions: Vec<ReaderAction>,
+    data: Vec<u8>,
+}
+
+impl Arbitrary<'_> for FuzzInput {
+    fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
+        let data: Vec<u8> = {
+            // Choose a suitable range for the data length
+            let data_len = u.int_in_range(1..=100)?;
+            u.bytes(data_len)?.to_vec()
+        };
+        let mut actions = vec![];
+        while u.len() > 0 {
+            match u.int_in_range(0..=2)? {
+                0 => {
+                    // Ensure size is smaller than data size
+                    let size = u.int_in_range(0..=data.len())?;
+                    actions.push(ReaderAction::Read { size });
+                }
+                1 => {
+                    // Ensure offset is smaller than data size
+                    let offset = u.int_in_range(0..=data.len())?;
+                    actions.push(ReaderAction::Seek { offset });
+                }
+                _ => actions.push(ReaderAction::Next),
+            }
+        }
+        Ok(FuzzInput { actions, data })
+    }
+}
+
+fuzz_target!(|input: FuzzInput| {
+    let len = input.data.len();
+    let mut builder = services::Fs::default();
+    let cwd = env::current_dir().unwrap();
+    let path: String = format!("{}/tmp", cwd.to_string_lossy());
+    builder.root(&path);
+    let result: anyhow::Result<()> = tokio::runtime::Runtime::new().unwrap().block_on(async {
+        let op: Operator = Operator::new(builder)?.finish();
+        let path = uuid::Uuid::new_v4().to_string();
+        op.write(&path, input.data)
+            .await
+            .expect("write must succeed");
+        let mut o = op
+            .range_reader(&path, 0..len as u64)
+            .await
+            .expect("range_reader must succeed");
+        for action in input.actions {
+            match action {
+                ReaderAction::Read { size } => {
+                    let mut buf = vec![0; size];
+                    o.read(&mut buf).await.expect("read must succeed");
+                }
+                ReaderAction::Seek { offset } => {
+                    o.seek(std::io::SeekFrom::Start(offset as u64))
+                        .await
+                        .expect("seek must succeed");
+                }
+                ReaderAction::Next => {
+                    o.next()
+                        .await
+                        .map(|v| v.expect("next should not return error"));
+                }
+            }
+        }
+        op.delete(&path).await.expect("delete must succeed");
+        Ok(())
+    });
+});

From f29acf80cee99f9a6d9a0990db903002c4d3ba13 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Sat, 8 Jul 2023 17:06:57 +0800
Subject: [PATCH 02/13] fix: add different seek modes

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 core/fuzz/fuzz_targets/fuzz_reader_fs.rs | 45 ++++++++++++++++++++----
 1 file changed, 38 insertions(+), 7 deletions(-)

diff --git a/core/fuzz/fuzz_targets/fuzz_reader_fs.rs b/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
index b6c6d6679d2..9141711fba3 100644
--- a/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
+++ b/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
@@ -26,16 +26,33 @@ use std::env;
 #[derive(Debug)]
 enum ReaderAction {
     Read { size: usize },
-    Seek { offset: usize },
+    Seek { offset: usize, mode:SeekMode },
     Next,
 }
 
+#[derive(Debug)]
+enum SeekMode {
+    Start,
+    End,
+    Current,
+}
+
 #[derive(Debug)]
 struct FuzzInput {
     actions: Vec<ReaderAction>,
     data: Vec<u8>,
 }
 
+impl Arbitrary<'_> for SeekMode {
+    fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
+        match u.int_in_range(0..=2)? {
+            0 => Ok(SeekMode::Start),
+            1 => Ok(SeekMode::End),
+            _ => Ok(SeekMode::Current),
+        }
+    }
+}
+
 impl Arbitrary<'_> for FuzzInput {
     fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
         let data: Vec<u8> = {
@@ -53,8 +70,9 @@ impl Arbitrary<'_> for FuzzInput {
                 }
                 1 => {
                     // Ensure offset is smaller than data size
+                    let mode = SeekMode::arbitrary(u)?;
                     let offset = u.int_in_range(0..=data.len())?;
-                    actions.push(ReaderAction::Seek { offset });
+                    actions.push(ReaderAction::Seek { mode, offset });
                 }
                 _ => actions.push(ReaderAction::Next),
             }
@@ -69,6 +87,7 @@ fuzz_target!(|input: FuzzInput| {
     let cwd = env::current_dir().unwrap();
     let path: String = format!("{}/tmp", cwd.to_string_lossy());
     builder.root(&path);
+
     let result: anyhow::Result<()> = tokio::runtime::Runtime::new().unwrap().block_on(async {
         let op: Operator = Operator::new(builder)?.finish();
         let path = uuid::Uuid::new_v4().to_string();
@@ -78,15 +97,23 @@ fuzz_target!(|input: FuzzInput| {
         let mut o = op
             .range_reader(&path, 0..len as u64)
             .await
-            .expect("range_reader must succeed");
+            .expect("init range_reader must succeed");
+
         for action in input.actions {
             match action {
                 ReaderAction::Read { size } => {
                     let mut buf = vec![0; size];
-                    o.read(&mut buf).await.expect("read must succeed");
+                    o.read(&mut buf)
+                        .await
+                        .expect("read must succeed");
                 }
-                ReaderAction::Seek { offset } => {
-                    o.seek(std::io::SeekFrom::Start(offset as u64))
+                ReaderAction::Seek { mode, offset } => {
+                    let seek_from = match mode {
+                        SeekMode::Start => std::io::SeekFrom::Start(offset as u64),
+                        SeekMode::End => std::io::SeekFrom::End(offset as i64),
+                        SeekMode::Current => std::io::SeekFrom::Current(offset as i64),
+                    };
+                    o.seek(seek_from)
                         .await
                         .expect("seek must succeed");
                 }
@@ -97,7 +124,11 @@ fuzz_target!(|input: FuzzInput| {
                 }
             }
         }
-        op.delete(&path).await.expect("delete must succeed");
+        op.delete(&path)
+            .await
+            .expect("delete must succeed");
         Ok(())
     });
+
+    result.expect("fuzz target must succeed");
 });

From 8922d94c98f2b36a61bed7a12c7b6fa6f1d8abfe Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Sat, 8 Jul 2023 17:22:39 +0800
Subject: [PATCH 03/13] fix: add missing license header

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 core/fuzz/Cargo.toml | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/core/fuzz/Cargo.toml b/core/fuzz/Cargo.toml
index 332be936701..0d72720a692 100644
--- a/core/fuzz/Cargo.toml
+++ b/core/fuzz/Cargo.toml
@@ -1,3 +1,20 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
 [package]
 name = "opendal-fuzz"
 version = "0.0.0"

From 27d5bd0807ce9435396b86033a5961c56b9835b4 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Sat, 8 Jul 2023 22:01:19 +0800
Subject: [PATCH 04/13] fix: fix format problems and rewrite seekfrom

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 Cargo.lock                               |   47 +-
 Cargo.toml                               |    2 +
 core/fuzz/Cargo.lock                     | 1917 ----------------------
 core/fuzz/Cargo.toml                     |   15 +-
 core/fuzz/fuzz_targets/fuzz_reader_fs.rs |   62 +-
 5 files changed, 70 insertions(+), 1973 deletions(-)
 delete mode 100644 core/fuzz/Cargo.lock

diff --git a/Cargo.lock b/Cargo.lock
index 8e5d808cf85..803b0ec76db 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -104,6 +104,15 @@ version = "1.0.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c7d0618f0e0b7e8ff11427422b64564d5fb0be1940354bfe2e0529b18a9d9b8"
 
+[[package]]
+name = "arbitrary"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
+dependencies = [
+ "derive_arbitrary",
+]
+
 [[package]]
 name = "arc-swap"
 version = "1.6.0"
@@ -1170,6 +1179,17 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "derive_arbitrary"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.16",
+]
+
 [[package]]
 name = "derive_destructure2"
 version = "0.1.1"
@@ -2094,6 +2114,17 @@ version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
+[[package]]
+name = "libfuzzer-sys"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "beb09950ae85a0a94b27676cccf37da5ff13f27076aa1adbc6545dd0d0e1bd4e"
+dependencies = [
+ "arbitrary",
+ "cc",
+ "once_cell",
+]
+
 [[package]]
 name = "libloading"
 version = "0.7.4"
@@ -2870,6 +2901,18 @@ dependencies = [
  "opendal",
 ]
 
+[[package]]
+name = "opendal-fuzz"
+version = "0.0.0"
+dependencies = [
+ "anyhow",
+ "arbitrary",
+ "libfuzzer-sys",
+ "opendal",
+ "tokio",
+ "uuid",
+]
+
 [[package]]
 name = "opendal-hs"
 version = "0.1.0"
@@ -5257,9 +5300,9 @@ checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 
 [[package]]
 name = "uuid"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1674845326ee10d37ca60470760d4288a6f80f304007d92e5c53bab78c9cfd79"
+checksum = "d023da39d1fde5a8a3fe1f3e01ca9632ada0a63e9797de55a879d6e2236277be"
 dependencies = [
  "getrandom 0.2.8",
  "rand 0.8.5",
diff --git a/Cargo.toml b/Cargo.toml
index 8720e7da282..3ba419d3ef5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,6 +36,8 @@ members = [
 
   "bin/oli",
   "bin/oay",
+
+  "core/fuzz",
 ]
 
 [workspace.package]
diff --git a/core/fuzz/Cargo.lock b/core/fuzz/Cargo.lock
deleted file mode 100644
index 15b86f81c0b..00000000000
--- a/core/fuzz/Cargo.lock
+++ /dev/null
@@ -1,1917 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "addr2line"
-version = "0.20.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4fa78e18c64fce05e902adecd7a5eed15a5e0a3439f7b0e169f0252214865e3"
-dependencies = [
- "gimli",
-]
-
-[[package]]
-name = "adler"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
-
-[[package]]
-name = "android-tzdata"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
-
-[[package]]
-name = "android_system_properties"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "anyhow"
-version = "1.0.71"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c7d0618f0e0b7e8ff11427422b64564d5fb0be1940354bfe2e0529b18a9d9b8"
-
-[[package]]
-name = "arbitrary"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
-dependencies = [
- "derive_arbitrary",
-]
-
-[[package]]
-name = "async-compat"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b48b4ff0c2026db683dea961cd8ea874737f56cffca86fa84415eaddc51c00d"
-dependencies = [
- "futures-core",
- "futures-io",
- "once_cell",
- "pin-project-lite",
- "tokio",
-]
-
-[[package]]
-name = "async-trait"
-version = "0.1.69"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b2d0f03b3640e3a630367e40c468cb7f309529c708ed1d88597047b0e7c6ef7"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "autocfg"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
-
-[[package]]
-name = "backon"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c1a6197b2120bb2185a267f6515038558b019e92b832bb0320e96d66268dcf9"
-dependencies = [
- "fastrand",
- "futures-core",
- "pin-project",
- "tokio",
-]
-
-[[package]]
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diff --git a/core/fuzz/Cargo.toml b/core/fuzz/Cargo.toml
index 0d72720a692..066da0d766f 100644
--- a/core/fuzz/Cargo.toml
+++ b/core/fuzz/Cargo.toml
@@ -16,10 +16,10 @@
 # under the License.
 
 [package]
+edition = "2021"
 name = "opendal-fuzz"
-version = "0.0.0"
 publish = false
-edition = "2018"
+version = "0.0.0"
 
 [package.metadata]
 cargo-fuzz = true
@@ -28,22 +28,15 @@ cargo-fuzz = true
 anyhow = "1.0.71"
 arbitrary = { version = "1.3.0", features = ["derive"] }
 libfuzzer-sys = "0.4"
+opendal = { path = ".." }
 tokio = { version = "1", features = ["full"] }
 uuid = { version = "1.4.0", features = ["v4"] }
 
-
-[dependencies.opendal]
-path = ".."
-
-# Prevent this from interfering with workspaces
-[workspace]
-members = ["."]
-
 [profile.release]
 debug = 1
 
 [[bin]]
+doc = false
 name = "fuzz_reader_fs"
 path = "fuzz_targets/fuzz_reader_fs.rs"
 test = false
-doc = false
diff --git a/core/fuzz/fuzz_targets/fuzz_reader_fs.rs b/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
index 9141711fba3..ed4d66acd69 100644
--- a/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
+++ b/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
@@ -22,57 +22,44 @@ use libfuzzer_sys::fuzz_target;
 use opendal::raw::oio::ReadExt;
 use opendal::{services, Operator};
 use std::env;
+use std::io::SeekFrom;
+
+const MAX_DATA_SIZE: usize = 1000;
 
 #[derive(Debug)]
 enum ReaderAction {
     Read { size: usize },
-    Seek { offset: usize, mode:SeekMode },
+    Seek(SeekFrom),
     Next,
 }
 
-#[derive(Debug)]
-enum SeekMode {
-    Start,
-    End,
-    Current,
-}
-
 #[derive(Debug)]
 struct FuzzInput {
     actions: Vec<ReaderAction>,
     data: Vec<u8>,
 }
 
-impl Arbitrary<'_> for SeekMode {
-    fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
-        match u.int_in_range(0..=2)? {
-            0 => Ok(SeekMode::Start),
-            1 => Ok(SeekMode::End),
-            _ => Ok(SeekMode::Current),
-        }
-    }
-}
-
 impl Arbitrary<'_> for FuzzInput {
     fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
-        let data: Vec<u8> = {
-            // Choose a suitable range for the data length
-            let data_len = u.int_in_range(1..=100)?;
-            u.bytes(data_len)?.to_vec()
-        };
+        // Choose a suitable range for the data length
+        let data_len = u.int_in_range(1..=MAX_DATA_SIZE)?;
+        let data: Vec<u8> = u.bytes(data_len)?.to_vec();
         let mut actions = vec![];
         while u.len() > 0 {
             match u.int_in_range(0..=2)? {
                 0 => {
                     // Ensure size is smaller than data size
-                    let size = u.int_in_range(0..=data.len())?;
+                    let size = u.int_in_range(0..=data_len)?;
                     actions.push(ReaderAction::Read { size });
                 }
                 1 => {
-                    // Ensure offset is smaller than data size
-                    let mode = SeekMode::arbitrary(u)?;
-                    let offset = u.int_in_range(0..=data.len())?;
-                    actions.push(ReaderAction::Seek { mode, offset });
+                    let offset = u.int_in_range(0..=data_len)?;
+                    let seek_from = match u.int_in_range(0..=2)? {
+                        0 => SeekFrom::Start(offset as u64),
+                        1 => SeekFrom::End(offset as i64),
+                        _ => SeekFrom::Current(offset as i64),
+                    };
+                    actions.push(ReaderAction::Seek(seek_from));
                 }
                 _ => actions.push(ReaderAction::Next),
             }
@@ -103,19 +90,10 @@ fuzz_target!(|input: FuzzInput| {
             match action {
                 ReaderAction::Read { size } => {
                     let mut buf = vec![0; size];
-                    o.read(&mut buf)
-                        .await
-                        .expect("read must succeed");
+                    o.read(&mut buf).await.expect("read must succeed");
                 }
-                ReaderAction::Seek { mode, offset } => {
-                    let seek_from = match mode {
-                        SeekMode::Start => std::io::SeekFrom::Start(offset as u64),
-                        SeekMode::End => std::io::SeekFrom::End(offset as i64),
-                        SeekMode::Current => std::io::SeekFrom::Current(offset as i64),
-                    };
-                    o.seek(seek_from)
-                        .await
-                        .expect("seek must succeed");
+                ReaderAction::Seek(seek_from) => {
+                    o.seek(seek_from).await.expect("seek must succeed");
                 }
                 ReaderAction::Next => {
                     o.next()
@@ -124,9 +102,7 @@ fuzz_target!(|input: FuzzInput| {
                 }
             }
         }
-        op.delete(&path)
-            .await
-            .expect("delete must succeed");
+        op.delete(&path).await.expect("delete must succeed");
         Ok(())
     });
 

From d923a89663a609de8ad391e27b600980639f1be7 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Sat, 8 Jul 2023 22:20:37 +0800
Subject: [PATCH 05/13] fix: make clippy happy

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 core/fuzz/fuzz_targets/fuzz_reader_fs.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/fuzz/fuzz_targets/fuzz_reader_fs.rs b/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
index ed4d66acd69..13537027f5c 100644
--- a/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
+++ b/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
@@ -45,7 +45,7 @@ impl Arbitrary<'_> for FuzzInput {
         let data_len = u.int_in_range(1..=MAX_DATA_SIZE)?;
         let data: Vec<u8> = u.bytes(data_len)?.to_vec();
         let mut actions = vec![];
-        while u.len() > 0 {
+        while !u.is_empty() {
             match u.int_in_range(0..=2)? {
                 0 => {
                     // Ensure size is smaller than data size

From d683bde1666154046b1ad89442a1205026b7fec1 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Tue, 11 Jul 2023 09:54:22 +0800
Subject: [PATCH 06/13] feat: add service env setting

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 Cargo.lock                                    |  5 +-
 core/fuzz/Cargo.toml                          |  5 +-
 .../fuzz_reader_fs.rs => fuzz_reader.rs}      | 54 ++++++++++++-------
 core/fuzz/utils.rs                            | 48 +++++++++++++++++
 4 files changed, 88 insertions(+), 24 deletions(-)
 rename core/fuzz/{fuzz_targets/fuzz_reader_fs.rs => fuzz_reader.rs} (72%)
 create mode 100644 core/fuzz/utils.rs

diff --git a/Cargo.lock b/Cargo.lock
index 803b0ec76db..36ec4c2be6a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1283,9 +1283,9 @@ checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
 
 [[package]]
 name = "dotenvy"
-version = "0.15.6"
+version = "0.15.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03d8c417d7a8cb362e0c37e5d815f5eb7c37f79ff93707329d5a194e42e54ca0"
+checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
 
 [[package]]
 name = "downcast-rs"
@@ -2907,6 +2907,7 @@ version = "0.0.0"
 dependencies = [
  "anyhow",
  "arbitrary",
+ "dotenvy",
  "libfuzzer-sys",
  "opendal",
  "tokio",
diff --git a/core/fuzz/Cargo.toml b/core/fuzz/Cargo.toml
index 066da0d766f..f81151d2ebb 100644
--- a/core/fuzz/Cargo.toml
+++ b/core/fuzz/Cargo.toml
@@ -27,6 +27,7 @@ cargo-fuzz = true
 [dependencies]
 anyhow = "1.0.71"
 arbitrary = { version = "1.3.0", features = ["derive"] }
+dotenvy = "0.15.7"
 libfuzzer-sys = "0.4"
 opendal = { path = ".." }
 tokio = { version = "1", features = ["full"] }
@@ -37,6 +38,6 @@ debug = 1
 
 [[bin]]
 doc = false
-name = "fuzz_reader_fs"
-path = "fuzz_targets/fuzz_reader_fs.rs"
+name = "fuzz_reader"
+path = "fuzz_reader.rs"
 test = false
diff --git a/core/fuzz/fuzz_targets/fuzz_reader_fs.rs b/core/fuzz/fuzz_reader.rs
similarity index 72%
rename from core/fuzz/fuzz_targets/fuzz_reader_fs.rs
rename to core/fuzz/fuzz_reader.rs
index 13537027f5c..5ea587225c3 100644
--- a/core/fuzz/fuzz_targets/fuzz_reader_fs.rs
+++ b/core/fuzz/fuzz_reader.rs
@@ -17,23 +17,24 @@
 
 #![no_main]
 
+mod utils;
+
 use libfuzzer_sys::arbitrary::{Arbitrary, Result, Unstructured};
 use libfuzzer_sys::fuzz_target;
 use opendal::raw::oio::ReadExt;
-use opendal::{services, Operator};
-use std::env;
+use opendal::Operator;
 use std::io::SeekFrom;
 
 const MAX_DATA_SIZE: usize = 1000;
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 enum ReaderAction {
     Read { size: usize },
     Seek(SeekFrom),
     Next,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 struct FuzzInput {
     actions: Vec<ReaderAction>,
     data: Vec<u8>,
@@ -68,43 +69,56 @@ impl Arbitrary<'_> for FuzzInput {
     }
 }
 
-fuzz_target!(|input: FuzzInput| {
+fn fuzz_reader(name: &str, op: &Operator, input: FuzzInput) {
     let len = input.data.len();
-    let mut builder = services::Fs::default();
-    let cwd = env::current_dir().unwrap();
-    let path: String = format!("{}/tmp", cwd.to_string_lossy());
-    builder.root(&path);
-
     let result: anyhow::Result<()> = tokio::runtime::Runtime::new().unwrap().block_on(async {
-        let op: Operator = Operator::new(builder)?.finish();
         let path = uuid::Uuid::new_v4().to_string();
         op.write(&path, input.data)
             .await
-            .expect("write must succeed");
+            .expect(format!("{} write must succeed", name).as_str());
         let mut o = op
             .range_reader(&path, 0..len as u64)
             .await
-            .expect("init range_reader must succeed");
+            .expect(format!("{} init range_reader must succeed", name).as_str());
 
         for action in input.actions {
             match action {
                 ReaderAction::Read { size } => {
                     let mut buf = vec![0; size];
-                    o.read(&mut buf).await.expect("read must succeed");
+                    o.read(&mut buf)
+                        .await
+                        .expect(format!("{} read must succeed", name).as_str());
                 }
                 ReaderAction::Seek(seek_from) => {
-                    o.seek(seek_from).await.expect("seek must succeed");
+                    o.seek(seek_from)
+                        .await
+                        .expect(format!("{} seek must succeed", name).as_str());
                 }
                 ReaderAction::Next => {
-                    o.next()
-                        .await
-                        .map(|v| v.expect("next should not return error"));
+                    o.next().await.map(|v| {
+                        v.expect(format!("{} next should not return error", name).as_str())
+                    });
                 }
             }
         }
-        op.delete(&path).await.expect("delete must succeed");
+        op.delete(&path)
+            .await
+            .expect(format!("{} delete must succeed", name).as_str());
         Ok(())
     });
 
-    result.expect("fuzz target must succeed");
+    result.expect(format!("{} fuzz_reader must succeed", name).as_str())
+}
+
+fuzz_target!(|input: FuzzInput| {
+    let _ = dotenvy::dotenv();
+    for service in utils::init_services() {
+        if service.1.is_none() {
+            continue;
+        }
+
+        let op = service.1.unwrap();
+
+        fuzz_reader(service.0, &op, input.clone());
+    }
 });
diff --git a/core/fuzz/utils.rs b/core/fuzz/utils.rs
new file mode 100644
index 00000000000..184ed33aa37
--- /dev/null
+++ b/core/fuzz/utils.rs
@@ -0,0 +1,48 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+use opendal::{services, Builder, Operator};
+use std::env;
+
+fn service<B: Builder>() -> Option<Operator> {
+    let test_key = format!("opendal_{}_test", B::SCHEME).to_uppercase();
+    if env::var(test_key).unwrap_or_default() != "on" {
+        return None;
+    }
+
+    let prefix = format!("opendal_{}_", B::SCHEME);
+    let envs = env::vars()
+        .filter_map(move |(k, v)| {
+            k.to_lowercase()
+                .strip_prefix(&prefix)
+                .map(|k| (k.to_string(), v))
+        })
+        .collect();
+
+    Some(
+        Operator::from_map::<B>(envs)
+            .unwrap_or_else(|_| panic!("init {} must succeed", B::SCHEME))
+            .finish(),
+    )
+}
+
+pub fn init_services() -> Vec<(&'static str, Option<Operator>)> {
+    vec![
+        ("fs", service::<services::Fs>()),
+        ("memory", service::<services::Memory>()),
+    ]
+}

From 336ade858c5c7b996b56f5b5cf4da026ba5a8f56 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Tue, 11 Jul 2023 09:57:35 +0800
Subject: [PATCH 07/13] fix: README

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 core/fuzz/README.md | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/core/fuzz/README.md b/core/fuzz/README.md
index a2382265613..d6204fcd057 100644
--- a/core/fuzz/README.md
+++ b/core/fuzz/README.md
@@ -10,6 +10,23 @@ To run the fuzz tests, you need to switch your rust version to nightly. You can
 rustup override set nightly
 ```
 
+To run the fuzz tests, please copy the `.env.example`, which is at project root, to `.env` and change the values on need.
+
+Take `fs` for example, we need to change to enable behavior test on `fs` on `/tmp`.
+
+```dotenv
+OPENDAL_FS_TEST=false
+OPENDAL_FS_ROOT=/path/to/dir
+```
+
+into
+
+```dotenv
+OPENDAL_FS_TEST=on
+OPENDAL_FS_ROOT=/tmp
+```
+
+
 ## Run
 
 List all fuzz targets.
@@ -18,10 +35,10 @@ List all fuzz targets.
 cargo fuzz list
 ```
 
-Run a fuzz target(such as `fs` `reader`).
+Run a fuzz target(such as `reader`).
 
 ```bash
-cargo fuzz run fuzz_reader_fs
+cargo fuzz run fuzz_reader
 ```
 
 For more details, please visit [cargo fuzz](https://rust-fuzz.github.io/book/cargo-fuzz/tutorial.html) or run the command cargo fuzz --help.
\ No newline at end of file

From 01adcd6a048c139ef241d04cc0b6555c998c1165 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Thu, 13 Jul 2023 14:36:49 +0800
Subject: [PATCH 08/13] fix: README

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 Cargo.lock               |  8 ++--
 core/fuzz/Cargo.toml     |  4 +-
 core/fuzz/README.md      |  8 +---
 core/fuzz/fuzz_reader.rs | 86 +++++++++++++++++++++-------------------
 4 files changed, 54 insertions(+), 52 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 36ec4c2be6a..d4e38bb359a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1283,9 +1283,9 @@ checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
 
 [[package]]
 name = "dotenvy"
-version = "0.15.7"
+version = "0.15.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1aaf95b3e5c8f23aa320147307562d361db0ae0d51242340f558153b4eb2439b"
+checksum = "03d8c417d7a8cb362e0c37e5d815f5eb7c37f79ff93707329d5a194e42e54ca0"
 
 [[package]]
 name = "downcast-rs"
@@ -5301,9 +5301,9 @@ checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
 
 [[package]]
 name = "uuid"
-version = "1.4.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d023da39d1fde5a8a3fe1f3e01ca9632ada0a63e9797de55a879d6e2236277be"
+checksum = "1674845326ee10d37ca60470760d4288a6f80f304007d92e5c53bab78c9cfd79"
 dependencies = [
  "getrandom 0.2.8",
  "rand 0.8.5",
diff --git a/core/fuzz/Cargo.toml b/core/fuzz/Cargo.toml
index f81151d2ebb..96896d27240 100644
--- a/core/fuzz/Cargo.toml
+++ b/core/fuzz/Cargo.toml
@@ -27,11 +27,11 @@ cargo-fuzz = true
 [dependencies]
 anyhow = "1.0.71"
 arbitrary = { version = "1.3.0", features = ["derive"] }
-dotenvy = "0.15.7"
+dotenvy = "0.15.6"
 libfuzzer-sys = "0.4"
 opendal = { path = ".." }
 tokio = { version = "1", features = ["full"] }
-uuid = { version = "1.4.0", features = ["v4"] }
+uuid = { version = "1.3.0", features = ["v4"] }
 
 [profile.release]
 debug = 1
diff --git a/core/fuzz/README.md b/core/fuzz/README.md
index d6204fcd057..e08bb125db9 100644
--- a/core/fuzz/README.md
+++ b/core/fuzz/README.md
@@ -4,11 +4,7 @@ fuzz test are used to test the robustness of the code.
 
 ## Setup
 
-To run the fuzz tests, you need to switch your rust version to nightly. You can do this by running the following command:
 
-```bash
-rustup override set nightly
-```
 
 To run the fuzz tests, please copy the `.env.example`, which is at project root, to `.env` and change the values on need.
 
@@ -32,13 +28,13 @@ OPENDAL_FS_ROOT=/tmp
 List all fuzz targets.
 
 ```bash
-cargo fuzz list
+cargo +nightly fuzz list
 ```
 
 Run a fuzz target(such as `reader`).
 
 ```bash
-cargo fuzz run fuzz_reader
+cargo +nightly fuzz run fuzz_reader
 ```
 
 For more details, please visit [cargo fuzz](https://rust-fuzz.github.io/book/cargo-fuzz/tutorial.html) or run the command cargo fuzz --help.
\ No newline at end of file
diff --git a/core/fuzz/fuzz_reader.rs b/core/fuzz/fuzz_reader.rs
index 5ea587225c3..90dc6bc73f5 100644
--- a/core/fuzz/fuzz_reader.rs
+++ b/core/fuzz/fuzz_reader.rs
@@ -25,7 +25,7 @@ use opendal::raw::oio::ReadExt;
 use opendal::Operator;
 use std::io::SeekFrom;
 
-const MAX_DATA_SIZE: usize = 1000;
+const MAX_DATA_SIZE: usize = 16 * 1024 * 1024;
 
 #[derive(Debug, Clone)]
 enum ReaderAction {
@@ -46,17 +46,18 @@ impl Arbitrary<'_> for FuzzInput {
         let data_len = u.int_in_range(1..=MAX_DATA_SIZE)?;
         let data: Vec<u8> = u.bytes(data_len)?.to_vec();
         let mut actions = vec![];
-        while !u.is_empty() {
+        let mut action_count = u.int_in_range(128..=1024)?;
+        while action_count != 0 {
+            action_count -= 1;
             match u.int_in_range(0..=2)? {
                 0 => {
-                    // Ensure size is smaller than data size
-                    let size = u.int_in_range(0..=data_len)?;
+                    let size = u.int_in_range(0..=data_len * 2)?;
                     actions.push(ReaderAction::Read { size });
                 }
                 1 => {
-                    let offset = u.int_in_range(0..=data_len)?;
+                    let offset: i32 = u.int_in_range(-(data_len as i32)..=(data_len as i32))?;
                     let seek_from = match u.int_in_range(0..=2)? {
-                        0 => SeekFrom::Start(offset as u64),
+                        0 => SeekFrom::Start(offset.abs() as u64),
                         1 => SeekFrom::End(offset as i64),
                         _ => SeekFrom::Current(offset as i64),
                     };
@@ -69,45 +70,50 @@ impl Arbitrary<'_> for FuzzInput {
     }
 }
 
-fn fuzz_reader(name: &str, op: &Operator, input: FuzzInput) {
+async fn fuzz_reader_process(input: FuzzInput, op: &Operator, name: &str) -> Result<()> {
     let len = input.data.len();
-    let result: anyhow::Result<()> = tokio::runtime::Runtime::new().unwrap().block_on(async {
-        let path = uuid::Uuid::new_v4().to_string();
-        op.write(&path, input.data)
-            .await
-            .expect(format!("{} write must succeed", name).as_str());
-        let mut o = op
-            .range_reader(&path, 0..len as u64)
-            .await
-            .expect(format!("{} init range_reader must succeed", name).as_str());
-
-        for action in input.actions {
-            match action {
-                ReaderAction::Read { size } => {
-                    let mut buf = vec![0; size];
-                    o.read(&mut buf)
-                        .await
-                        .expect(format!("{} read must succeed", name).as_str());
-                }
-                ReaderAction::Seek(seek_from) => {
-                    o.seek(seek_from)
-                        .await
-                        .expect(format!("{} seek must succeed", name).as_str());
-                }
-                ReaderAction::Next => {
-                    o.next().await.map(|v| {
-                        v.expect(format!("{} next should not return error", name).as_str())
-                    });
-                }
+    let path = uuid::Uuid::new_v4().to_string();
+    op.write(&path, input.data)
+        .await
+        .expect(format!("{} write must succeed", name).as_str());
+    let mut o = op
+        .range_reader(&path, 0..len as u64)
+        .await
+        .expect(format!("{} init range_reader must succeed", name).as_str());
+    let cur = 0;
+    for action in input.actions {
+        match action {
+            ReaderAction::Read { size } => {
+                let mut buf = vec![0; size];
+                o.read(&mut buf)
+                    .await
+                    .expect(format!("{} read must succeed", name).as_str());
+            }
+            ReaderAction::Seek(seek_from) => {
+                o.seek(seek_from)
+                    .await
+                    .expect(format!("{} seek must succeed", name).as_str());
+            }
+            ReaderAction::Next => {
+                o.next()
+                    .await
+                    .map(|v| v.expect(format!("{} next should not return error", name).as_str()));
             }
         }
-        op.delete(&path)
+    }
+    op.delete(&path)
+        .await
+        .expect(format!("{} delete must succeed", name).as_str());
+    Ok(())
+}
+
+fn fuzz_reader(name: &str, op: &Operator, input: FuzzInput) {
+    let runtime = tokio::runtime::Runtime::new().unwrap();
+    runtime.block_on(async {
+        fuzz_reader_process(input, &op, name)
             .await
-            .expect(format!("{} delete must succeed", name).as_str());
-        Ok(())
+            .expect(format!("{} fuzz_reader must succeed", name).as_str());
     });
-
-    result.expect(format!("{} fuzz_reader must succeed", name).as_str())
 }
 
 fuzz_target!(|input: FuzzInput| {

From 05c7384a33ecf881126e36cedcd1ef8c45a37c31 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Sat, 15 Jul 2023 22:08:45 +0800
Subject: [PATCH 09/13] feat: add checker

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 Cargo.lock               |  3 +-
 core/fuzz/Cargo.toml     |  1 +
 core/fuzz/fuzz_reader.rs | 69 +++++++++++++++++++++++++++++++++++++---
 3 files changed, 67 insertions(+), 6 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 9b264ba4144..cd93f7f410f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1153,7 +1153,7 @@ checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.23",
 ]
 
 [[package]]
@@ -2943,6 +2943,7 @@ dependencies = [
  "dotenvy",
  "libfuzzer-sys",
  "opendal",
+ "sha2",
  "tokio",
  "uuid",
 ]
diff --git a/core/fuzz/Cargo.toml b/core/fuzz/Cargo.toml
index 96896d27240..193362e2926 100644
--- a/core/fuzz/Cargo.toml
+++ b/core/fuzz/Cargo.toml
@@ -32,6 +32,7 @@ libfuzzer-sys = "0.4"
 opendal = { path = ".." }
 tokio = { version = "1", features = ["full"] }
 uuid = { version = "1.3.0", features = ["v4"] }
+sha2 = { version = "0.10.6"}
 
 [profile.release]
 debug = 1
diff --git a/core/fuzz/fuzz_reader.rs b/core/fuzz/fuzz_reader.rs
index 90dc6bc73f5..43e1e7761d9 100644
--- a/core/fuzz/fuzz_reader.rs
+++ b/core/fuzz/fuzz_reader.rs
@@ -24,6 +24,7 @@ use libfuzzer_sys::fuzz_target;
 use opendal::raw::oio::ReadExt;
 use opendal::Operator;
 use std::io::SeekFrom;
+use sha2::{Digest, Sha256};
 
 const MAX_DATA_SIZE: usize = 16 * 1024 * 1024;
 
@@ -70,9 +71,68 @@ impl Arbitrary<'_> for FuzzInput {
     }
 }
 
+struct ReaderFuzzerChecker {
+    data: Vec<u8>,
+    size: usize,
+    cur: usize,
+}
+
+impl ReaderFuzzerChecker {
+    fn new(data: Vec<u8>) -> Self {
+        Self {
+            size: data.len(),
+            data,
+            cur: 0,
+        }
+    }
+
+    fn check_read(&mut self, n: usize, output: &[u8]) {
+        let expected = &self.data[self.cur..self.cur + n];
+
+        // Check the read result
+        assert_eq!(
+            format!("{:x}", Sha256::digest(output)),
+            format!("{:x}", Sha256::digest(expected)),
+            "check read failed: output bs is different with expected bs",
+        );
+
+        // Update the current position
+        self.cur += n;
+    }
+
+    fn check_seek(&mut self, seek_from: SeekFrom, output: Result<u64>) {
+        let expected = match seek_from {
+            SeekFrom::Start(offset) => offset,
+            SeekFrom::End(offset) => {
+                if offset < 0 {
+                    self.size as u64 - offset.abs() as u64
+                } else {
+                    self.size as u64 + offset as u64
+                }
+            }
+            SeekFrom::Current(offset) => {
+                if offset < 0 {
+                    self.cur as u64 - offset.abs() as u64
+                } else {
+                    self.cur as u64 + offset as u64
+                }
+            }
+        };
+        assert_eq!(
+            output.unwrap(),
+            expected,
+            "check seek failed: output offset is different with expected offset",
+        );
+    }
+
+}
+
+
+
 async fn fuzz_reader_process(input: FuzzInput, op: &Operator, name: &str) -> Result<()> {
     let len = input.data.len();
     let path = uuid::Uuid::new_v4().to_string();
+    let mut checker = ReaderFuzzerChecker::new(input.data.clone());
     op.write(&path, input.data)
         .await
         .expect(format!("{} write must succeed", name).as_str());
@@ -80,19 +140,18 @@ async fn fuzz_reader_process(input: FuzzInput, op: &Operator, name: &str) -> Res
         .range_reader(&path, 0..len as u64)
         .await
         .expect(format!("{} init range_reader must succeed", name).as_str());
-    let cur = 0;
     for action in input.actions {
         match action {
             ReaderAction::Read { size } => {
                 let mut buf = vec![0; size];
-                o.read(&mut buf)
+                let n = o.read(&mut buf)
                     .await
                     .expect(format!("{} read must succeed", name).as_str());
+                checker.check_read(n, &buf[..n]);
             }
             ReaderAction::Seek(seek_from) => {
-                o.seek(seek_from)
-                    .await
-                    .expect(format!("{} seek must succeed", name).as_str());
+                let res = o.seek(seek_from).await;
+
             }
             ReaderAction::Next => {
                 o.next()

From cbb08869aa423dd3022e877880d9d39d89242778 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Sun, 16 Jul 2023 17:10:40 +0800
Subject: [PATCH 10/13] feat: finish checker

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 Cargo.lock               |  1 +
 core/fuzz/Cargo.toml     |  1 +
 core/fuzz/fuzz_reader.rs | 94 ++++++++++++++++++++++++++++------------
 3 files changed, 68 insertions(+), 28 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index cd93f7f410f..34b3ece0852 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2940,6 +2940,7 @@ version = "0.0.0"
 dependencies = [
  "anyhow",
  "arbitrary",
+ "bytes",
  "dotenvy",
  "libfuzzer-sys",
  "opendal",
diff --git a/core/fuzz/Cargo.toml b/core/fuzz/Cargo.toml
index 193362e2926..2983ead7673 100644
--- a/core/fuzz/Cargo.toml
+++ b/core/fuzz/Cargo.toml
@@ -27,6 +27,7 @@ cargo-fuzz = true
 [dependencies]
 anyhow = "1.0.71"
 arbitrary = { version = "1.3.0", features = ["derive"] }
+bytes = "1.2"
 dotenvy = "0.15.6"
 libfuzzer-sys = "0.4"
 opendal = { path = ".." }
diff --git a/core/fuzz/fuzz_reader.rs b/core/fuzz/fuzz_reader.rs
index 43e1e7761d9..21e97a09c84 100644
--- a/core/fuzz/fuzz_reader.rs
+++ b/core/fuzz/fuzz_reader.rs
@@ -19,12 +19,13 @@
 
 mod utils;
 
+use bytes::Bytes;
 use libfuzzer_sys::arbitrary::{Arbitrary, Result, Unstructured};
 use libfuzzer_sys::fuzz_target;
 use opendal::raw::oio::ReadExt;
 use opendal::Operator;
-use std::io::SeekFrom;
 use sha2::{Digest, Sha256};
+use std::io::SeekFrom;
 
 const MAX_DATA_SIZE: usize = 16 * 1024 * 1024;
 
@@ -43,11 +44,12 @@ struct FuzzInput {
 
 impl Arbitrary<'_> for FuzzInput {
     fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
-        // Choose a suitable range for the data length
         let data_len = u.int_in_range(1..=MAX_DATA_SIZE)?;
         let data: Vec<u8> = u.bytes(data_len)?.to_vec();
+
         let mut actions = vec![];
         let mut action_count = u.int_in_range(128..=1024)?;
+
         while action_count != 0 {
             action_count -= 1;
             match u.int_in_range(0..=2)? {
@@ -87,6 +89,10 @@ impl ReaderFuzzerChecker {
     }
 
     fn check_read(&mut self, n: usize, output: &[u8]) {
+        if n == 0 {
+            return;
+        }
+
         let expected = &self.data[self.cur..self.cur + n];
 
         // Check the read result
@@ -100,66 +106,96 @@ impl ReaderFuzzerChecker {
         self.cur += n;
     }
 
-    fn check_seek(&mut self, seek_from: SeekFrom, output: Result<u64>) {
+    fn check_seek(&mut self, seek_from: SeekFrom, output: opendal::Result<u64>) {
         let expected = match seek_from {
-            SeekFrom::Start(offset) => offset,
-            SeekFrom::End(offset) => {
-                if offset < 0 {
-                    self.size as u64 - offset.abs() as u64
-                } else {
-                    self.size as u64 + offset as u64
-                }
-            }
-            SeekFrom::Current(offset) => {
-                if offset < 0 {
-                    self.cur as u64 - offset.abs() as u64
-                } else {
-                    self.cur as u64 + offset as u64
-                }
-            }
+            SeekFrom::Start(offset) => offset as i64,
+            SeekFrom::End(offset) => self.size as i64 + offset,
+            SeekFrom::Current(offset) => self.cur as i64 + offset,
         };
-        assert_eq!(
-            output.unwrap(),
-            expected,
-            "check seek failed: output offset is different with expected offset",
-        );
+
+        if expected < 0 {
+            assert!(output.is_err(), "check seek failed: seek should fail");
+            assert_eq!(
+                output.unwrap_err().kind(),
+                opendal::ErrorKind::InvalidInput,
+                "check seek failed: seek result is different with expected result"
+            );
+        } else {
+            assert_eq!(
+                output.unwrap(),
+                expected as u64,
+                "check seek failed: seek result is different with expected result",
+            );
+            self.cur = expected as usize;
+        }
     }
 
+    fn check_next(&mut self, output: Option<Bytes>) {
+        if let Some(output) = output {
+            assert!(
+                self.cur + output.len() <= self.size,
+                "check next failed: output bs is larger than remaining bs",
+            );
+
+            assert_eq!(
+                format!("{:x}", Sha256::digest(&output)),
+                format!(
+                    "{:x}",
+                    Sha256::digest(&self.data[self.cur..self.cur + output.len()])
+                ),
+                "check next failed: output bs is different with expected bs",
+            );
+
+            self.cur += output.len();
+        } else {
+            assert!(
+                self.cur >= self.size,
+                "check next failed: output bs is None, we still have bytes to read",
+            )
+        }
+    }
 }
 
-
-
 async fn fuzz_reader_process(input: FuzzInput, op: &Operator, name: &str) -> Result<()> {
     let len = input.data.len();
     let path = uuid::Uuid::new_v4().to_string();
+
     let mut checker = ReaderFuzzerChecker::new(input.data.clone());
     op.write(&path, input.data)
         .await
         .expect(format!("{} write must succeed", name).as_str());
+
     let mut o = op
         .range_reader(&path, 0..len as u64)
         .await
         .expect(format!("{} init range_reader must succeed", name).as_str());
+
     for action in input.actions {
         match action {
             ReaderAction::Read { size } => {
                 let mut buf = vec![0; size];
-                let n = o.read(&mut buf)
+                let n = o
+                    .read(&mut buf)
                     .await
                     .expect(format!("{} read must succeed", name).as_str());
                 checker.check_read(n, &buf[..n]);
             }
+
             ReaderAction::Seek(seek_from) => {
                 let res = o.seek(seek_from).await;
-
+                checker.check_seek(seek_from, res);
             }
+
             ReaderAction::Next => {
-                o.next()
+                let res = o
+                    .next()
                     .await
                     .map(|v| v.expect(format!("{} next should not return error", name).as_str()));
+                checker.check_next(res);
             }
         }
     }
+
     op.delete(&path)
         .await
         .expect(format!("{} delete must succeed", name).as_str());
@@ -168,6 +204,7 @@ async fn fuzz_reader_process(input: FuzzInput, op: &Operator, name: &str) -> Res
 
 fn fuzz_reader(name: &str, op: &Operator, input: FuzzInput) {
     let runtime = tokio::runtime::Runtime::new().unwrap();
+
     runtime.block_on(async {
         fuzz_reader_process(input, &op, name)
             .await
@@ -177,6 +214,7 @@ fn fuzz_reader(name: &str, op: &Operator, input: FuzzInput) {
 
 fuzz_target!(|input: FuzzInput| {
     let _ = dotenvy::dotenv();
+
     for service in utils::init_services() {
         if service.1.is_none() {
             continue;

From c05a81a94b5e4b96770cada0f491961c11aedc24 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Sun, 16 Jul 2023 17:22:16 +0800
Subject: [PATCH 11/13] fix: make clippy happy

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 core/fuzz/fuzz_reader.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/core/fuzz/fuzz_reader.rs b/core/fuzz/fuzz_reader.rs
index 21e97a09c84..1d03f71a629 100644
--- a/core/fuzz/fuzz_reader.rs
+++ b/core/fuzz/fuzz_reader.rs
@@ -58,11 +58,11 @@ impl Arbitrary<'_> for FuzzInput {
                     actions.push(ReaderAction::Read { size });
                 }
                 1 => {
-                    let offset: i32 = u.int_in_range(-(data_len as i32)..=(data_len as i32))?;
+                    let offset: i64 = u.int_in_range(-(data_len as i64)..=(data_len as i64))?;
                     let seek_from = match u.int_in_range(0..=2)? {
-                        0 => SeekFrom::Start(offset.abs() as u64),
-                        1 => SeekFrom::End(offset as i64),
-                        _ => SeekFrom::Current(offset as i64),
+                        0 => SeekFrom::Start(offset.unsigned_abs()),
+                        1 => SeekFrom::End(offset),
+                        _ => SeekFrom::Current(offset),
                     };
                     actions.push(ReaderAction::Seek(seek_from));
                 }
@@ -206,7 +206,7 @@ fn fuzz_reader(name: &str, op: &Operator, input: FuzzInput) {
     let runtime = tokio::runtime::Runtime::new().unwrap();
 
     runtime.block_on(async {
-        fuzz_reader_process(input, &op, name)
+        fuzz_reader_process(input, op, name)
             .await
             .expect(format!("{} fuzz_reader must succeed", name).as_str());
     });

From 8022cd7b9d51d0ca62e2ea4e1de1b7c48f37795a Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Sun, 16 Jul 2023 17:33:33 +0800
Subject: [PATCH 12/13] fix: continue fight with clippy

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 core/fuzz/fuzz_reader.rs | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/core/fuzz/fuzz_reader.rs b/core/fuzz/fuzz_reader.rs
index 1d03f71a629..1cc87071033 100644
--- a/core/fuzz/fuzz_reader.rs
+++ b/core/fuzz/fuzz_reader.rs
@@ -163,12 +163,12 @@ async fn fuzz_reader_process(input: FuzzInput, op: &Operator, name: &str) -> Res
     let mut checker = ReaderFuzzerChecker::new(input.data.clone());
     op.write(&path, input.data)
         .await
-        .expect(format!("{} write must succeed", name).as_str());
+        .unwrap_or_else(|_| panic!("{} write must succeed", name));
 
     let mut o = op
         .range_reader(&path, 0..len as u64)
         .await
-        .expect(format!("{} init range_reader must succeed", name).as_str());
+        .unwrap_or_else(|_| panic!("{} init range_reader must succeed", name));
 
     for action in input.actions {
         match action {
@@ -177,7 +177,7 @@ async fn fuzz_reader_process(input: FuzzInput, op: &Operator, name: &str) -> Res
                 let n = o
                     .read(&mut buf)
                     .await
-                    .expect(format!("{} read must succeed", name).as_str());
+                    .unwrap_or_else(|_| panic!("{} read must succeed", name));
                 checker.check_read(n, &buf[..n]);
             }
 
@@ -190,7 +190,7 @@ async fn fuzz_reader_process(input: FuzzInput, op: &Operator, name: &str) -> Res
                 let res = o
                     .next()
                     .await
-                    .map(|v| v.expect(format!("{} next should not return error", name).as_str()));
+                    .map(|v| v.unwrap_or_else(|_| panic!("{} next should not return error", name)));
                 checker.check_next(res);
             }
         }
@@ -198,7 +198,7 @@ async fn fuzz_reader_process(input: FuzzInput, op: &Operator, name: &str) -> Res
 
     op.delete(&path)
         .await
-        .expect(format!("{} delete must succeed", name).as_str());
+        .unwrap_or_else(|_| panic!("{} delete must succeed", name));
     Ok(())
 }
 
@@ -208,7 +208,7 @@ fn fuzz_reader(name: &str, op: &Operator, input: FuzzInput) {
     runtime.block_on(async {
         fuzz_reader_process(input, op, name)
             .await
-            .expect(format!("{} fuzz_reader must succeed", name).as_str());
+            .unwrap_or_else(|_| panic!("{} fuzz_reader must succeed", name));
     });
 }
 

From 6b681c248ff9285df7141398bbce43e904969eb5 Mon Sep 17 00:00:00 2001
From: dqhl76 <dqhl76@gmail.com>
Date: Sun, 16 Jul 2023 17:44:17 +0800
Subject: [PATCH 13/13] polish

Signed-off-by: dqhl76 <dqhl76@gmail.com>
---
 core/fuzz/Cargo.toml     | 2 +-
 core/fuzz/fuzz_reader.rs | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/core/fuzz/Cargo.toml b/core/fuzz/Cargo.toml
index 2983ead7673..03fa4c5cf64 100644
--- a/core/fuzz/Cargo.toml
+++ b/core/fuzz/Cargo.toml
@@ -31,9 +31,9 @@ bytes = "1.2"
 dotenvy = "0.15.6"
 libfuzzer-sys = "0.4"
 opendal = { path = ".." }
+sha2 = { version = "0.10.6" }
 tokio = { version = "1", features = ["full"] }
 uuid = { version = "1.3.0", features = ["v4"] }
-sha2 = { version = "0.10.6"}
 
 [profile.release]
 debug = 1
diff --git a/core/fuzz/fuzz_reader.rs b/core/fuzz/fuzz_reader.rs
index 1cc87071033..7ebb0ff2528 100644
--- a/core/fuzz/fuzz_reader.rs
+++ b/core/fuzz/fuzz_reader.rs
@@ -126,6 +126,8 @@ impl ReaderFuzzerChecker {
                 expected as u64,
                 "check seek failed: seek result is different with expected result",
             );
+
+            // only update the current position when seek succeed
             self.cur = expected as usize;
         }
     }
@@ -146,6 +148,7 @@ impl ReaderFuzzerChecker {
                 "check next failed: output bs is different with expected bs",
             );
 
+            // update the current position
             self.cur += output.len();
         } else {
             assert!(