From 00082c668fefdba8a373720b54adfbbe514b7196 Mon Sep 17 00:00:00 2001
From: cjw <cjwcommuny@outlook.com>
Date: Sun, 16 Oct 2022 14:46:57 +0800
Subject: [PATCH] time: panic in release mode when `mark_pending` called
 illegally (#5093)

---
 tokio/src/runtime/time/entry.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tokio/src/runtime/time/entry.rs b/tokio/src/runtime/time/entry.rs
index 2f36d46e0ed..c4c4ba1b775 100644
--- a/tokio/src/runtime/time/entry.rs
+++ b/tokio/src/runtime/time/entry.rs
@@ -172,7 +172,12 @@ impl StateCell {
         let mut cur_state = self.state.load(Ordering::Relaxed);
 
         loop {
-            debug_assert!(cur_state < STATE_MIN_VALUE);
+            // improve the error message for things like
+            // https://github.com/tokio-rs/tokio/issues/3675
+            assert!(
+                cur_state < STATE_MIN_VALUE,
+                "mark_pending called when the timer entry is in an invalid state"
+            );
 
             if cur_state > not_after {
                 break Err(cur_state);