diff --git a/script/Cargo.toml b/script/Cargo.toml
index db7f913e02c..3c492a727fb 100644
--- a/script/Cargo.toml
+++ b/script/Cargo.toml
@@ -28,7 +28,7 @@ ckb-logger = { path = "../util/logger", version = "= 0.114.0-pre", optional = tr
 serde = { version = "1.0", features = ["derive"] }
 ckb-error = { path = "../error", version = "= 0.114.0-pre" }
 ckb-chain-spec = { path = "../spec", version = "= 0.114.0-pre" }
-tokio = { version = "1.35.0", features = ["sync", "rt-multi-thread"] }
+tokio = { version = "1.35.0", features = ["rt-multi-thread"] }
 
 [dev-dependencies]
 proptest = "1.0"
diff --git a/script/src/syscalls/spawn.rs b/script/src/syscalls/spawn.rs
index 15301bc1997..9b7fee0298f 100644
--- a/script/src/syscalls/spawn.rs
+++ b/script/src/syscalls/spawn.rs
@@ -235,6 +235,9 @@ where
                 Ok(true)
             }
             Err(err) => {
+                // `CyclesExceeded` for old version snapshot
+                // `Pause` for new version suspend with pause signal
+                // Maybe we need to cleanup in future
                 if matches!(err, VMError::Pause | VMError::CyclesExceeded) {
                     let mut context = self.context.lock().map_err(|e| {
                         VMError::Unexpected(format!("Failed to acquire lock: {}", e))
diff --git a/script/src/verify.rs b/script/src/verify.rs
index b4e3cb558c1..cc8dee5bdef 100644
--- a/script/src/verify.rs
+++ b/script/src/verify.rs
@@ -693,8 +693,9 @@ impl<DL: CellDataProvider + HeaderProvider + ExtensionProvider + Send + Sync + C
         Ok(VerifyResult::Completed(cycles))
     }
 
-    /// Performing a resumable verification on the transaction scripts with signal
-    /// If `Suspend` comes from `command_rx`, the process will be hang up until `Resume` comes.
+    /// Performing a resumable verification on the transaction scripts with signal channel,
+    /// if `Suspend` comes from `command_rx`, the process will be hang up until `Resume` comes,
+    /// otherwise, it will return until the verification is completed.
     pub async fn resumable_verify_with_signal(
         &self,
         limit_cycles: Cycle,
@@ -718,8 +719,8 @@ impl<DL: CellDataProvider + HeaderProvider + ExtensionProvider + Send + Sync + C
                     cycles = wrapping_cycles_add(cycles, used_cycles, group)?;
                 }
                 Ok(ChunkState::Suspended(_vms, _context)) => {
-                    // FIXME: we need to cleanup this later, state will not contain snapshot
-                    panic!("unexpect suspend in resumable_verify_with_signal");
+                    // FIXME(yukang): we need to cleanup this later, state will not contain snapshot
+                    unreachable!("unexpect suspend in resumable_verify_with_signal");
                 }
                 Err(e) => {
                     #[cfg(feature = "logging")]
@@ -1051,10 +1052,7 @@ impl<DL: CellDataProvider + HeaderProvider + ExtensionProvider + Send + Sync + C
                 script_group: group,
                 max_cycles,
             };
-            match verifier.verify() {
-                Ok(cycles) => Ok(ChunkState::Completed(cycles)),
-                Err(e) => Err(e),
-            }
+            verifier.verify().map(ChunkState::Completed)
         } else {
             self.chunk_run_with_signal(group, max_cycles, command_rx)
                 .await
@@ -1200,7 +1198,7 @@ impl<DL: CellDataProvider + HeaderProvider + ExtensionProvider + Send + Sync + C
             vec![ResumableMachine::initial(machine)]
         };
 
-        run_vms_with_signal(script_group, max_cycles, machines, context, command_rx).await
+        run_vms_with_signal(script_group, machines, context, command_rx).await
     }
 
     fn chunk_run(
@@ -1383,9 +1381,9 @@ fn run_vms(
 }
 
 // Run a series of VMs with control signal, will only return when verification finished
+// Or send `Stop` command when verification is suspended
 async fn run_vms_with_signal(
     script_group: &ScriptGroup,
-    max_cycles: Cycle,
     machines: Vec<ResumableMachine>,
     context: Arc<Mutex<MachineContext>>,
     signal: &mut Receiver<ChunkCommand>,
@@ -1435,11 +1433,7 @@ async fn run_vms_with_signal(
                             exit_code
                         ))},
                     (Err(err), _) => {
-                        let map_vm_internal_error = |error: VMInternalError| match error {
-                        VMInternalError::CyclesExceeded => ScriptError::ExceededMaximumCycles(max_cycles),
-                        _ => ScriptError::VMInternalError(error),
-                        };
-                        return Err(map_vm_internal_error(err));
+                        return Err(ScriptError::VMInternalError(err));
                     }
                 }
 
@@ -1456,13 +1450,13 @@ async fn run_vms_child(
     context: Arc<Mutex<MachineContext>>,
 ) {
     let (mut exit_code, mut cycles, mut spawn_data) = (0, 0, None);
-    child_recv.mark_changed();
     // mark changed to make sure we can receive initial command
     // and start to run immediately
+    child_recv.mark_changed();
     loop {
         select! {
             _ = child_recv.changed() => {
-                match child_recv.borrow().to_owned() {
+                match *child_recv.borrow() {
                     ChunkCommand::Stop => {
                         let exit = (Err(ckb_vm::Error::Unexpected("stopped".to_string())), cycles);
                         let _ = finished_send.send(exit);
diff --git a/tx-pool/src/process.rs b/tx-pool/src/process.rs
index 2a4064fb1d5..83dbd6c5f9d 100644
--- a/tx-pool/src/process.rs
+++ b/tx-pool/src/process.rs
@@ -189,16 +189,16 @@ impl TxPoolService {
         }
     }
 
+    pub(crate) async fn verify_queue_contains(&self, tx: &TransactionView) -> bool {
+        let queue = self.verify_queue.read().await;
+        queue.contains_key(&tx.proposal_short_id())
+    }
+
     pub(crate) async fn orphan_contains(&self, tx: &TransactionView) -> bool {
         let orphan = self.orphan.read().await;
         orphan.contains_key(&tx.proposal_short_id())
     }
 
-    pub(crate) async fn chunk_contains(&self, tx: &TransactionView) -> bool {
-        let chunk = self.verify_queue.read().await;
-        chunk.contains_key(&tx.proposal_short_id())
-    }
-
     pub(crate) async fn with_tx_pool_read_lock<U, F: FnMut(&TxPool, Arc<Snapshot>) -> U>(
         &self,
         mut f: F,
@@ -302,7 +302,7 @@ impl TxPoolService {
             return Err(Reject::Duplicated(tx.hash()));
         }
 
-        if self.chunk_contains(&tx).await {
+        if self.verify_queue_contains(&tx).await {
             return Err(Reject::Duplicated(tx.hash()));
         }
 
@@ -334,7 +334,7 @@ impl TxPoolService {
         // non contextual verify first
         self.non_contextual_verify(&tx, remote)?;
 
-        if self.chunk_contains(&tx).await || self.orphan_contains(&tx).await {
+        if self.verify_queue_contains(&tx).await || self.orphan_contains(&tx).await {
             return Err(Reject::Duplicated(tx.hash()));
         }
 
@@ -365,8 +365,8 @@ impl TxPoolService {
     pub(crate) async fn remove_tx(&self, tx_hash: Byte32) -> bool {
         let id = ProposalShortId::from_tx_hash(&tx_hash);
         {
-            let mut chunk = self.verify_queue.write().await;
-            if chunk.remove_tx(&id).is_some() {
+            let mut queue = self.verify_queue.write().await;
+            if queue.remove_tx(&id).is_some() {
                 return true;
             }
         }
@@ -527,7 +527,7 @@ impl TxPoolService {
             for orphan in orphans.into_iter() {
                 if orphan.cycle > self.tx_pool_config.max_tx_verify_cycles {
                     debug!(
-                        "process_orphan {} added to chunk; find previous from {}",
+                        "process_orphan {} added to verify queue; find previous from {}",
                         orphan.tx.hash(),
                         tx.hash(),
                     );
@@ -828,8 +828,8 @@ impl TxPoolService {
         tx: TransactionView,
         remote: Option<(Cycle, PeerIndex)>,
     ) -> Result<bool, Reject> {
-        let mut chunk = self.verify_queue.write().await;
-        chunk.add_tx(tx, remote)
+        let mut queue = self.verify_queue.write().await;
+        queue.add_tx(tx, remote)
     }
 
     pub(crate) async fn _process_tx(
@@ -1015,8 +1015,8 @@ impl TxPoolService {
 
         self.remove_orphan_txs_by_attach(&attached).await;
         {
-            let mut chunk = self.verify_queue.write().await;
-            chunk.remove_txs(attached.iter().map(|tx| tx.proposal_short_id()));
+            let mut queue = self.verify_queue.write().await;
+            queue.remove_txs(attached.iter().map(|tx| tx.proposal_short_id()));
         }
     }