diff --git a/library/std/tests/sync/condvar.rs b/library/std/tests/sync/condvar.rs
index 1d712a643003a..1b1c33efad58e 100644
--- a/library/std/tests/sync/condvar.rs
+++ b/library/std/tests/sync/condvar.rs
@@ -17,7 +17,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads.
 nonpoison_and_poison_unwrap_test!(
     name: notify_one,
     test_body: {
@@ -38,7 +38,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads.
 nonpoison_and_poison_unwrap_test!(
     name: notify_all,
     test_body: {
@@ -79,7 +79,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads.
 nonpoison_and_poison_unwrap_test!(
     name: test_mutex_arc_condvar,
     test_body: {
@@ -116,7 +116,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads.
 nonpoison_and_poison_unwrap_test!(
     name: wait_while,
     test_body: {
@@ -141,7 +141,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads.
 nonpoison_and_poison_unwrap_test!(
     name: wait_timeout_wait,
     test_body: {
@@ -164,7 +164,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads.
 nonpoison_and_poison_unwrap_test!(
     name: wait_timeout_while_wait,
     test_body: {
@@ -180,7 +180,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads.
 nonpoison_and_poison_unwrap_test!(
     name: wait_timeout_while_instant_satisfy,
     test_body: {
@@ -197,7 +197,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads.
 nonpoison_and_poison_unwrap_test!(
     name: wait_timeout_while_wake,
     test_body: {
@@ -226,7 +226,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(any(target_os = "emscripten", target_os = "wasi"), ignore)] // no threads
+#[cfg(not(any(target_os = "emscripten", target_os = "wasi")))] // No threads.
 nonpoison_and_poison_unwrap_test!(
     name: wait_timeout_wake,
     test_body: {
diff --git a/library/std/tests/sync/lib.rs b/library/std/tests/sync/lib.rs
index ac1dbebcc5cb0..23112e102844f 100644
--- a/library/std/tests/sync/lib.rs
+++ b/library/std/tests/sync/lib.rs
@@ -58,6 +58,9 @@ fn result_unwrap<T, E: std::fmt::Debug>(x: Result<T, E>) -> T {
 /// a no-op (the identity function).
 ///
 /// The test names will be prefiex with `poison_` or `nonpoison_`.
+///
+/// Important: most attributes (except `cfg`) will not work properly! (They are only applied to the first test.)
+/// See <https://github.com/rust-lang/rust/pull/146433> for more information.
 macro_rules! nonpoison_and_poison_unwrap_test {
     (
         name: $name:ident,
diff --git a/library/std/tests/sync/mutex.rs b/library/std/tests/sync/mutex.rs
index 612c75c7aef51..2445764001b8b 100644
--- a/library/std/tests/sync/mutex.rs
+++ b/library/std/tests/sync/mutex.rs
@@ -266,7 +266,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
+#[cfg(panic = "unwind")] // Requires unwinding support.
 nonpoison_and_poison_unwrap_test!(
     name: test_panics,
     test_body: {
@@ -297,7 +297,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
+#[cfg(panic = "unwind")] // Requires unwinding support.
 nonpoison_and_poison_unwrap_test!(
     name: test_mutex_arc_access_in_unwind,
     test_body: {
diff --git a/library/std/tests/sync/rwlock.rs b/library/std/tests/sync/rwlock.rs
index eca15d2a4adb8..65d8bac719456 100644
--- a/library/std/tests/sync/rwlock.rs
+++ b/library/std/tests/sync/rwlock.rs
@@ -50,7 +50,7 @@ nonpoison_and_poison_unwrap_test!(
 // FIXME: On macOS we use a provenance-incorrect implementation and Miri
 // catches that issue with a chance of around 1/1000.
 // See <https://github.com/rust-lang/rust/issues/121950> for details.
-#[cfg_attr(all(miri, target_os = "macos"), ignore)]
+#[cfg(not(all(miri, target_os = "macos")))]
 nonpoison_and_poison_unwrap_test!(
     name: frob,
     test_body: {
@@ -124,7 +124,7 @@ nonpoison_and_poison_unwrap_test!(
     }
 );
 
-#[cfg_attr(not(panic = "unwind"), ignore = "test requires unwinding support")]
+#[cfg(panic = "unwind")] // Requires unwinding support.
 nonpoison_and_poison_unwrap_test!(
     name: test_rw_arc_access_in_unwind,
     test_body: {
@@ -315,7 +315,7 @@ nonpoison_and_poison_unwrap_test!(
 
 // FIXME: On macOS we use a provenance-incorrect implementation and Miri catches that issue.
 // See <https://github.com/rust-lang/rust/issues/121950> for details.
-#[cfg_attr(all(miri, target_os = "macos"), ignore)]
+#[cfg(not(all(miri, target_os = "macos")))]
 nonpoison_and_poison_unwrap_test!(
     name: test_downgrade_observe,
     test_body: {
@@ -362,7 +362,7 @@ nonpoison_and_poison_unwrap_test!(
 
 // FIXME: On macOS we use a provenance-incorrect implementation and Miri catches that issue.
 // See <https://github.com/rust-lang/rust/issues/121950> for details.
-#[cfg_attr(all(miri, target_os = "macos"), ignore)]
+#[cfg(not(all(miri, target_os = "macos")))]
 nonpoison_and_poison_unwrap_test!(
     name: test_downgrade_atomic,
     test_body: {