diff --git a/core/src/co_pool/mod.rs b/core/src/co_pool/mod.rs
index a0a80eb1..5d2f8b2c 100644
--- a/core/src/co_pool/mod.rs
+++ b/core/src/co_pool/mod.rs
@@ -70,9 +70,8 @@ impl Drop for CoroutinePool<'_> {
             self.get_running_size(),
             "There are still tasks in progress !"
         );
-        assert_eq!(
-            0,
-            self.task_queue.len(),
+        assert!(
+            self.task_queue.is_empty(),
             "There are still tasks to be carried out !"
         );
     }
diff --git a/core/src/coroutine/korosensei.rs b/core/src/coroutine/korosensei.rs
index 45381406..4743e69e 100644
--- a/core/src/coroutine/korosensei.rs
+++ b/core/src/coroutine/korosensei.rs
@@ -8,7 +8,7 @@ use crate::coroutine::StackInfo;
 use corosensei::stack::Stack;
 use corosensei::trap::TrapHandlerRegs;
 use corosensei::CoroutineResult;
-use std::cell::{Cell, RefCell};
+use std::cell::{Cell, RefCell, UnsafeCell};
 use std::collections::VecDeque;
 use std::ffi::c_longlong;
 use std::fmt::Debug;
@@ -29,7 +29,7 @@ pub struct Coroutine<'c, Param, Yield, Return> {
     pub(crate) name: String,
     inner: corosensei::Coroutine<Param, Yield, Result<Return, &'static str>, PooledStack>,
     pub(crate) state: Cell<CoroutineState<Yield, Return>>,
-    pub(crate) stack_infos: RefCell<VecDeque<StackInfo>>,
+    stack_infos: UnsafeCell<VecDeque<StackInfo>>,
     pub(crate) listeners: VecDeque<&'c dyn Listener<Yield, Return>>,
     pub(crate) local: CoroutineLocal<'c>,
     pub(crate) priority: Option<c_longlong>,
@@ -291,6 +291,25 @@ impl<'c, Param, Yield, Return> Coroutine<'c, Param, Yield, Return> {
         self.listeners.push_back(listener);
     }
 
+    pub(crate) fn stack_infos_ref(&self) -> &VecDeque<StackInfo> {
+        unsafe {
+            self.stack_infos
+                .get()
+                .as_ref()
+                .expect("StackInfo not init !")
+        }
+    }
+
+    #[allow(clippy::mut_from_ref)]
+    pub(crate) fn stack_infos_mut(&self) -> &mut VecDeque<StackInfo> {
+        unsafe {
+            self.stack_infos
+                .get()
+                .as_mut()
+                .expect("StackInfo not init !")
+        }
+    }
+
     /// Grows the call stack if necessary.
     ///
     /// This function is intended to be called at manually instrumented points in a program where
@@ -314,12 +333,12 @@ impl<'c, Param, Yield, Return> Coroutine<'c, Param, Yield, Return> {
                 return Ok(callback());
             }
             return stack_pool.allocate(stack_size).map(|stack| {
-                co.stack_infos.borrow_mut().push_back(StackInfo {
+                co.stack_infos_mut().push_back(StackInfo {
                     stack_top: stack.base().get(),
                     stack_bottom: stack.limit().get(),
                 });
                 let r = corosensei::on_stack(stack, callback);
-                _ = co.stack_infos.borrow_mut().pop_back();
+                _ = co.stack_infos_mut().pop_back();
                 r
             });
         }
@@ -380,7 +399,7 @@ where
     {
         let stack_size = stack_size.max(crate::common::page_size());
         let stack = MemoryPool::get_instance().allocate(stack_size)?;
-        let stack_infos = RefCell::new(VecDeque::from([StackInfo {
+        let stack_infos = UnsafeCell::new(VecDeque::from([StackInfo {
             stack_top: stack.base().get(),
             stack_bottom: stack.limit().get(),
         }]));
diff --git a/core/src/coroutine/mod.rs b/core/src/coroutine/mod.rs
index fcc6abc8..71aa8891 100644
--- a/core/src/coroutine/mod.rs
+++ b/core/src/coroutine/mod.rs
@@ -107,15 +107,15 @@ impl<'c, Param, Yield, Return> Coroutine<'c, Param, Yield, Return> {
     ///
     /// This can only be done safely in coroutine.
     pub unsafe fn remaining_stack(&self) -> usize {
-        let current_ptr = psm::stack_pointer() as usize;
-        current_ptr - self.stack_infos.borrow().back().unwrap().stack_bottom
+        let current_sp = psm::stack_pointer() as usize;
+        current_sp - self.stack_infos_ref().back().unwrap().stack_bottom
     }
 
     /// Queries the current stack info of this coroutine.
     ///
     /// The first used stack index is 0 and increases with usage.
     pub fn stack_infos(&self) -> VecDeque<StackInfo> {
-        self.stack_infos.borrow().clone()
+        self.stack_infos_ref().clone()
     }
 
     /// Checks whether the stack pointer at the point where a trap occurred is
@@ -126,7 +126,7 @@ impl<'c, Param, Yield, Return> Coroutine<'c, Param, Yield, Return> {
     /// The result of this function is only meaningful if the coroutine has not
     /// been dropped yet.
     pub fn stack_ptr_in_bounds(&self, stack_ptr: u64) -> bool {
-        for info in self.stack_infos.borrow().iter() {
+        for info in self.stack_infos_ref() {
             if info.stack_bottom as u64 <= stack_ptr && stack_ptr < info.stack_top as u64 {
                 return true;
             }
@@ -202,7 +202,7 @@ where
         f.debug_struct("Coroutine")
             .field("name", &self.name())
             .field("state", &self.state())
-            .field("stack_infos", &self.stack_infos)
+            .field("stack_infos", &self.stack_infos())
             .field("local", &self.local)
             .field("priority", &self.priority)
             .finish()
diff --git a/core/src/coroutine/stack_pool.rs b/core/src/coroutine/stack_pool.rs
index a756e0c8..bf6c03de 100644
--- a/core/src/coroutine/stack_pool.rs
+++ b/core/src/coroutine/stack_pool.rs
@@ -186,7 +186,7 @@ impl MemoryPool {
     }
 
     pub(crate) fn allocate(&self, stack_size: usize) -> std::io::Result<PooledStack> {
-        let heap = unsafe { self.pool.get().as_mut().expect("StackPool is not unique") };
+        let heap = unsafe { self.pool.get().as_mut().expect("MemoryPool is not unique") };
         // find min stack
         let mut not_use = Vec::new();
         while let Some(stack) = heap.peek() {
@@ -265,7 +265,7 @@ impl MemoryPool {
     /// Clean the expired stack.
     #[allow(dead_code)]
     pub(crate) fn clean(&self) {
-        let heap = unsafe { self.pool.get().as_mut().expect("StackPool is not unique") };
+        let heap = unsafe { self.pool.get().as_mut().expect("MemoryPool is not unique") };
         let mut maybe_free = Vec::new();
         while let Some(stack) = heap.peek() {
             if Rc::strong_count(&stack.stack) > 1 {