From 7931a8ddef674da07d1254c8e1af39c76e311e49 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Tue, 19 Nov 2024 08:01:45 +0100
Subject: [PATCH] ignore an occasionally-failing test in Miri

---
 library/std/src/sync/rwlock/tests.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/library/std/src/sync/rwlock/tests.rs b/library/std/src/sync/rwlock/tests.rs
index 02ac1c85b9124..29cad4400f189 100644
--- a/library/std/src/sync/rwlock/tests.rs
+++ b/library/std/src/sync/rwlock/tests.rs
@@ -550,6 +550,9 @@ fn test_downgrade_observe() {
 }
 
 #[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)]
 fn test_downgrade_atomic() {
     const NEW_VALUE: i32 = -1;