ci: disable tuning test when runing ASAN (#5770)

The tuning test relies on a predictable execution environment. It
assumes that spawning a new task can complete reasonably fast. When
running tests with ASAN, the tuning test will spurriously fail. After
investigating, I believe this is due to running tests with ASAN enabled
and without `release` in a low resource environment (CI) results in an
execution environment that is too slow for the tuning test to succeed.

.github/workflows/ci.yml

@@ -296,7 +296,7 @@ jobs:
       - name: asan
         run: cargo test --workspace --all-features --target x86_64-unknown-linux-gnu --tests -- --test-threads 1 --nocapture
         env:
-          RUSTFLAGS: -Z sanitizer=address
+          RUSTFLAGS: -Z sanitizer=address --cfg tokio_no_tuning_tests
           # Ignore `trybuild` errors as they are irrelevant and flaky on nightly
           TRYBUILD: overwrite
 
@@ -366,14 +366,14 @@ jobs:
       # First run with all features (including parking_lot)
       - run: cross test -p tokio --all-features --target ${{ matrix.target }} --tests
         env:
-          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_cross ${{ matrix.rustflags }}
+          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_tuning_tests ${{ matrix.rustflags }}
       # Now run without parking_lot
       - name: Remove `parking_lot` from `full` feature
         run: sed -i '0,/parking_lot/{/parking_lot/d;}' tokio/Cargo.toml
       # The `tokio_no_parking_lot` cfg is here to ensure the `sed` above does not silently break.
       - run: cross test -p tokio --features full,test-util --target ${{ matrix.target }} --tests
         env:
-          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_parking_lot --cfg tokio_cross ${{ matrix.rustflags }}
+          RUSTFLAGS: --cfg tokio_unstable -Dwarnings --cfg tokio_no_ipv6 --cfg tokio_no_parking_lot --cfg tokio_no_tuning_tests ${{ matrix.rustflags }}
 
   # See https://github.com/tokio-rs/tokio/issues/5187
   no-atomic-u64:

tokio/tests/rt_threaded.rs

@@ -35,7 +35,6 @@ fn single_thread() {
 }
 
 #[test]
-#[cfg(not(tokio_cross))]
 fn many_oneshot_futures() {
     // used for notifying the main thread
     const NUM: usize = 1_000;
@@ -595,7 +594,7 @@ async fn test_block_in_place4() {
 // is sufficient. If there is a regression, this test will hang. In theory, we
 // could add limits, but that would be likely to fail on CI.
 #[test]
-#[cfg(not(tokio_cross))]
+#[cfg(not(tokio_no_tuning_tests))]
 fn test_tuning() {
     use std::sync::atomic::AtomicBool;
     use std::time::Duration;