diff --git a/src/storage/tx/ob_trans_define_v4.cpp b/src/storage/tx/ob_trans_define_v4.cpp
index 2caab355a..f1186f854 100644
--- a/src/storage/tx/ob_trans_define_v4.cpp
+++ b/src/storage/tx/ob_trans_define_v4.cpp
@@ -446,6 +446,7 @@ int ObTxDesc::switch_to_idle()
   commit_task_.reset();
   modified_tables_.reset();
   state_ = State::IDLE;
+  op_sn_ = 0;
   return OB_SUCCESS;
 }
 
diff --git a/src/storage/tx/ob_tx_free_route.cpp b/src/storage/tx/ob_tx_free_route.cpp
index c9abd513e..70f7d2659 100644
--- a/src/storage/tx/ob_tx_free_route.cpp
+++ b/src/storage/tx/ob_tx_free_route.cpp
@@ -439,6 +439,11 @@ int ObTransService::txn_free_route__update_static_state(const uint32_t session_i
         } else { need_add_tx = true; }
       }
     } else if (!tx->tx_id_.is_valid()) {
+      if (tx->op_sn_ > 0) {
+        ObSpinLockGuard guard(tx->lock_);
+        TRANS_LOG_RET(WARN, OB_ERR_UNEXPECTED, "tx op_sn > 0", K(ret), KPC(tx));
+        tx->print_trace_();
+      }
       // reuse, overwrite
       need_add_tx = true;
       audit_record.reuse_tx_ = true;
@@ -523,10 +528,11 @@ int ObTransService::update_logic_clock_(const int64_t logic_clock, const ObTxDes
 {
   // if logic clock drift too much, disconnect required
   int ret = OB_SUCCESS;
-  if (logic_clock - ObClockGenerator::getClock() > 1_day ) {
-    TRANS_LOG(WARN, "logic clock is fast more than 1 day", K(logic_clock), KPC(tx));
-  } else if (check_fallback && (ObClockGenerator::getClock() - logic_clock > 1_day)) {
-    TRANS_LOG(WARN, "logic clock is slow more than 1 day", K(logic_clock), KPC(tx));
+  const int64_t cur_clock = ObClockGenerator::getClock();
+  if (logic_clock - cur_clock > 1_day ) {
+    TRANS_LOG(WARN, "logic clock is fast more than 1 day", K(logic_clock), K(cur_clock), KPC(tx));
+  } else if (check_fallback && (cur_clock - logic_clock > 1_day)) {
+    TRANS_LOG(WARN, "logic clock is slow more than 1 day", K(logic_clock), K(cur_clock), KPC(tx));
     if (OB_NOT_NULL(tx)) { tx->print_trace_(); }
   }
   if (OB_SUCC(ret)) {