diff --git a/monoio-compat/src/box_future.rs b/monoio-compat/src/box_future.rs
index c51cf093..dab601af 100644
--- a/monoio-compat/src/box_future.rs
+++ b/monoio-compat/src/box_future.rs
@@ -1,7 +1,7 @@
 use std::{future::Future, io};
 
 use monoio::BufResult;
-use reusable_box_future::{ReusableLocalBoxFuture, ReusableBoxFuture};
+use reusable_box_future::{ReusableBoxFuture, ReusableLocalBoxFuture};
 
 use crate::buf::{Buf, RawBuf};
 
diff --git a/monoio/Cargo.toml b/monoio/Cargo.toml
index e7cbc77c..51437299 100644
--- a/monoio/Cargo.toml
+++ b/monoio/Cargo.toml
@@ -90,3 +90,6 @@ signal = ["ctrlc", "sync"]
 signal-termination = ["signal", "ctrlc/termination"]
 # by default both iouring and legacy are enabled
 default = ["async-cancel", "bytes", "iouring", "legacy", "macros", "utils"]
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(loom)'] }
diff --git a/monoio/src/driver/legacy/iocp/core.rs b/monoio/src/driver/legacy/iocp/core.rs
index d871fd10..0c5cb4f1 100644
--- a/monoio/src/driver/legacy/iocp/core.rs
+++ b/monoio/src/driver/legacy/iocp/core.rs
@@ -47,7 +47,7 @@ impl CompletionPort {
             GetQueuedCompletionStatusEx(
                 self.handle,
                 entries.as_mut_ptr(),
-                std::cmp::min(entries.len(), u32::max_value() as usize) as u32,
+                std::cmp::min(entries.len(), u32::MAX as usize) as u32,
                 &mut count,
                 duration_millis(timeout),
                 0,
diff --git a/monoio/src/driver/op/accept.rs b/monoio/src/driver/op/accept.rs
index 0b17fd50..e683ed96 100644
--- a/monoio/src/driver/op/accept.rs
+++ b/monoio/src/driver/op/accept.rs
@@ -122,9 +122,8 @@ impl OpAble for Accept {
             let stream_fd = syscall_u32!(accept(fd, addr, len))? as i32;
             syscall_u32!(fcntl(stream_fd, libc::F_SETFD, libc::FD_CLOEXEC))
                 .and_then(|_| syscall_u32!(fcntl(stream_fd, libc::F_SETFL, libc::O_NONBLOCK)))
-                .map_err(|e| {
+                .inspect_err(|_| {
                     let _ = syscall_u32!(close(stream_fd));
-                    e
                 })?;
             Ok(stream_fd as _)
         };
diff --git a/monoio/src/driver/ready.rs b/monoio/src/driver/ready.rs
index 6262359a..df25b8a3 100644
--- a/monoio/src/driver/ready.rs
+++ b/monoio/src/driver/ready.rs
@@ -73,7 +73,7 @@ impl Ready {
     pub(crate) fn from_mio(event: &mio::event::Event) -> Ready {
         let mut ready = Ready::EMPTY;
 
-        #[cfg(all(target_os = "freebsd", feature = "net"))]
+        #[cfg(all(target_os = "freebsd", feature = "legacy"))]
         {
             if event.is_aio() {
                 ready |= Ready::READABLE;
@@ -149,6 +149,8 @@ impl Ready {
 /// Specifies the readiness events the caller is interested in when awaiting on
 /// I/O resource readiness states.
 #[derive(Clone, Copy, Eq, PartialEq)]
+// TODO: Do we need to remove it?
+#[allow(dead_code)]
 pub(crate) struct Interest(mio::Interest);
 
 impl Interest {
diff --git a/monoio/src/driver/shared_fd.rs b/monoio/src/driver/shared_fd.rs
index 0cf550c4..b9f370fb 100644
--- a/monoio/src/driver/shared_fd.rs
+++ b/monoio/src/driver/shared_fd.rs
@@ -57,9 +57,8 @@ impl State {
                     #[cfg(feature = "legacy")]
                     crate::driver::Inner::Legacy(_) => panic!("unexpected legacy runtime"),
                 })
-                .map_err(|e| {
+                .inspect_err(|_| {
                     let _ = crate::syscall!(fcntl(fd, libc::F_SETFL, 0));
-                    e
                 })?;
             *state = UringState::Legacy(Some(reg));
         } else {
@@ -97,9 +96,8 @@ impl State {
                 #[cfg(feature = "legacy")]
                 crate::driver::Inner::Legacy(_) => panic!("unexpected legacy runtime"),
             })
-            .map_err(|e| {
+            .inspect_err(|_| {
                 let _ = crate::syscall!(fcntl(fd, libc::F_SETFL, libc::O_NONBLOCK));
-                e
             })?;
         *self = State::Uring(UringState::Init);
         Ok(())
diff --git a/monoio/src/fs/metadata/mod.rs b/monoio/src/fs/metadata/mod.rs
index ae0fc755..55359bf0 100644
--- a/monoio/src/fs/metadata/mod.rs
+++ b/monoio/src/fs/metadata/mod.rs
@@ -1,13 +1,10 @@
 mod unix;
 mod windows;
 
-use crate::driver::op::Op;
+use std::{os::unix::fs::MetadataExt, path::Path, time::SystemTime};
 
-use super::file_type::FileType;
-use super::permissions::Permissions;
-use std::os::unix::fs::MetadataExt;
-use std::path::Path;
-use std::time::SystemTime;
+use super::{file_type::FileType, permissions::Permissions};
+use crate::driver::op::Op;
 
 /// Given a path, query the file system to get information about a file,
 /// directory, etc.
diff --git a/monoio/src/fs/metadata/windows.rs b/monoio/src/fs/metadata/windows.rs
index e69de29b..8b137891 100644
--- a/monoio/src/fs/metadata/windows.rs
+++ b/monoio/src/fs/metadata/windows.rs
@@ -0,0 +1 @@
+
diff --git a/monoio/src/lib.rs b/monoio/src/lib.rs
index fee78ed6..20cbb72d 100644
--- a/monoio/src/lib.rs
+++ b/monoio/src/lib.rs
@@ -2,6 +2,7 @@
 #![cfg_attr(docsrs, feature(doc_cfg))]
 #![warn(missing_docs, unreachable_pub)]
 #![allow(stable_features)]
+#![allow(clippy::macro_metavars_in_unsafe)]
 #![cfg_attr(feature = "unstable", feature(io_error_more))]
 #![cfg_attr(feature = "unstable", feature(lazy_cell))]
 #![cfg_attr(feature = "unstable", feature(stmt_expr_attributes))]
diff --git a/monoio/src/macros/select.rs b/monoio/src/macros/select.rs
index 8736ac8f..ad602904 100644
--- a/monoio/src/macros/select.rs
+++ b/monoio/src/macros/select.rs
@@ -36,13 +36,12 @@
 /// 2. Aggregate the `<async expression>`s from each branch, including the disabled ones. If the
 ///    branch is disabled, `<async expression>` is still evaluated, but the resulting future is not
 ///    polled.
-/// 3. Concurrently await on the results for all remaining `<async
-/// expression>`s. 4. Once an `<async expression>` returns a value, attempt to
-/// apply the value    to the provided `<pattern>`, if the pattern matches,
-/// evaluate `<handler>`    and return. If the pattern **does not** match,
-/// disable the current branch    and for the remainder of the current call to
-/// `select!`. Continue from step 3. 5. If **all** branches are disabled,
-/// evaluate the `else` expression. If no    else branch is provided, panic.
+/// 3. Concurrently await on the results for all remaining `<async expression>`s. 4. Once an `<async
+///    expression>` returns a value, attempt to apply the value    to the provided `<pattern>`, if
+///    the pattern matches, evaluate `<handler>`    and return. If the pattern **does not** match,
+///    disable the current branch    and for the remainder of the current call to `select!`.
+///    Continue from step 3. 5. If **all** branches are disabled, evaluate the `else` expression. If
+///    no    else branch is provided, panic.
 ///
 /// # Runtime characteristics
 ///
diff --git a/monoio/src/net/mod.rs b/monoio/src/net/mod.rs
index 6f4eb5c9..7aa47a1d 100644
--- a/monoio/src/net/mod.rs
+++ b/monoio/src/net/mod.rs
@@ -77,11 +77,10 @@ pub(crate) fn new_socket(
             .and_then(|_| {
                 crate::syscall!(fcntl(socket, libc::F_SETFD, libc::FD_CLOEXEC)).map(|_| socket)
             })
-            .map_err(|e| {
+            .inspect_err(|_| {
                 // If either of the `fcntl` calls failed, ensure the socket is
                 // closed and return the error.
                 let _ = crate::syscall!(close(socket));
-                e
             })
     });
 
@@ -116,13 +115,12 @@ pub(crate) fn new_socket(
         NO_ERROR as _
     )
     .map(|_: i32| socket as RawSocket)
-    .map_err(|e| {
+    .inspect_err(|_| {
         // If either of the `ioctlsocket` calls failed, ensure the socket is
         // closed and return the error.
         unsafe {
             closesocket(socket);
             WSACleanup();
         }
-        e
     })
 }
diff --git a/monoio/src/net/tcp/listener.rs b/monoio/src/net/tcp/listener.rs
index 70d04951..52b930f7 100644
--- a/monoio/src/net/tcp/listener.rs
+++ b/monoio/src/net/tcp/listener.rs
@@ -224,9 +224,8 @@ impl TcpListener {
             .as_ref()
             .unwrap()
             .local_addr()
-            .map(|addr| {
+            .inspect(|&addr| {
                 unsafe { &mut *meta }.local_addr = Some(addr);
-                addr
             })
     }
 
diff --git a/monoio/src/time/driver/entry.rs b/monoio/src/time/driver/entry.rs
index 83555749..2ab2337a 100644
--- a/monoio/src/time/driver/entry.rs
+++ b/monoio/src/time/driver/entry.rs
@@ -114,10 +114,6 @@ impl StateCell {
         }
     }
 
-    fn is_pending(&self) -> bool {
-        self.state.get() == STATE_PENDING_FIRE
-    }
-
     /// Returns the current expiration time, or None if not currently scheduled.
     fn when(&self) -> Option<u64> {
         let cur_state = self.state.get();
@@ -525,10 +521,6 @@ impl TimerHandle {
         unsafe { self.inner.as_ref().sync_when() }
     }
 
-    pub(super) unsafe fn is_pending(&self) -> bool {
-        unsafe { self.inner.as_ref().state.is_pending() }
-    }
-
     /// Forcibly sets the true and cached expiration times to the given tick.
     ///
     /// SAFETY: The caller must ensure that the handle remains valid, the driver
diff --git a/monoio/src/time/driver/mod.rs b/monoio/src/time/driver/mod.rs
index c270d4d7..3887dfe2 100644
--- a/monoio/src/time/driver/mod.rs
+++ b/monoio/src/time/driver/mod.rs
@@ -2,7 +2,6 @@
 // in the future, this will change to the reverse. For now, suppress this
 // warning and generally stick with being explicit about unsafety.
 #![allow(unused_unsafe)]
-#![cfg_attr(not(feature = "rt"), allow(dead_code))]
 
 //! Time driver
 
@@ -173,16 +172,6 @@ where
         }
     }
 
-    /// Returns a handle to the timer.
-    ///
-    /// The `Handle` is how `Sleep` instances are created. The `Sleep` instances
-    /// can either be created directly or the `Handle` instance can be passed to
-    /// `with_default`, setting the timer as the default timer for the execution
-    /// context.
-    pub(crate) fn handle(&self) -> Handle {
-        self.handle.clone()
-    }
-
     fn park_internal(&self, limit: Option<Duration>) -> io::Result<()> {
         let mut inner_state = self.handle.get().state.borrow_mut();
 
diff --git a/monoio/src/utils/slab.rs b/monoio/src/utils/slab.rs
index 58461137..651823dd 100644
--- a/monoio/src/utils/slab.rs
+++ b/monoio/src/utils/slab.rs
@@ -336,7 +336,7 @@ impl<T> Drop for Page<T> {
             } else {
                 // slow drop
                 to_drop.set_len(self.initialized);
-                std::mem::transmute::<_, Vec<Entry<T>>>(to_drop);
+                std::mem::transmute::<Vec<MaybeUninit<Entry<T>>>, Vec<Entry<T>>>(to_drop);
             }
         }
     }
diff --git a/monoio/tests/buf_writter.rs b/monoio/tests/buf_writter.rs
index c1f9e00a..7d6f4310 100644
--- a/monoio/tests/buf_writter.rs
+++ b/monoio/tests/buf_writter.rs
@@ -13,9 +13,9 @@ async fn ensure_buf_writter_write_properly() {
         let (_, stream_write) = stream.into_split();
 
         let mut buf_w = BufWriter::new(stream_write);
-        assert!(buf_w.write(&[b'1']).await.0.is_ok());
-        assert!(buf_w.write(&[b'2']).await.0.is_ok());
-        assert!(buf_w.write(&[b'3']).await.0.is_ok());
+        assert!(buf_w.write(b"1").await.0.is_ok());
+        assert!(buf_w.write(b"2").await.0.is_ok());
+        assert!(buf_w.write(b"3").await.0.is_ok());
         assert!(buf_w.flush().await.is_ok());
     });