diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f8fd34ce4..14ad34c10 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,6 @@ name: CI
 
 env:
   RUSTFLAGS: -Dwarnings
-  RUST_BACKTRACE: 1
   # Change to specific Rust release to pin
   rust_stable: stable
   rust_nightly: nightly-2023-05-18
diff --git a/tokio/tests/rt_threaded.rs b/tokio/tests/rt_threaded.rs
index fcfec74a3..581bd010d 100644
--- a/tokio/tests/rt_threaded.rs
+++ b/tokio/tests/rt_threaded.rs
@@ -628,9 +628,15 @@ fn test_tuning() {
 
     // Now, hammer the injection queue until the interval drops.
     let mut n = 0;
+    let mut i = 0;
     loop {
+        i += 1;
         let curr = interval.load(Relaxed);
 
+        if i % 10_000 == 9_999 {
+            println!("interval={curr}");
+        }
+
         if curr <= 8 {
             n += 1;
         } else {
@@ -652,9 +658,9 @@ fn test_tuning() {
                 let prev = counter.swap(0, Relaxed);
                 interval.store(prev, Relaxed);
             });
-
-            std::thread::yield_now();
         }
+
+        std::thread::yield_now();
     }
 
     flag.store(false, Relaxed);
@@ -680,9 +686,15 @@ fn test_tuning() {
 
     // Now, hammer the injection queue until the interval reaches the expected range.
     let mut n = 0;
+    let mut i = 0;
     loop {
+        i += 1;
         let curr = interval.load(Relaxed);
 
+        if i % 10_000 == 9_999 {
+            println!("interval(2)={curr}");
+        }
+
         if curr <= 1_000 && curr > 32 {
             n += 1;
         } else {