From a120fb7031c7ca7636ad3628b9758811e1303d41 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Sun, 4 Aug 2024 14:26:48 +0200
Subject: [PATCH] rwlock: disable 'frob' test in Miri on macOS

---
 library/std/src/sync/rwlock/tests.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/library/std/src/sync/rwlock/tests.rs b/library/std/src/sync/rwlock/tests.rs
index 12bb0fbf0503b..37a2e41641ac1 100644
--- a/library/std/src/sync/rwlock/tests.rs
+++ b/library/std/src/sync/rwlock/tests.rs
@@ -21,6 +21,10 @@ fn smoke() {
 }
 
 #[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)]
 fn frob() {
     const N: u32 = 10;
     const M: usize = if cfg!(miri) { 100 } else { 1000 };