Auto merge of #122218 - Zoxc:no-interleave-panics, r=michaelwoerister

Lock stderr in panic handler Fixes #119789.
rust-lang · Mar 12, 2024 · 7de1a1f · 7de1a1f · LowLevelCodingCH · Mar 12, 2024
2 parents 3b85d2c + 288380d
commit 7de1a1f
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs
@@ -1327,6 +1327,9 @@ pub fn install_ice_hook(
     panic::update_hook(Box::new(
         move |default_hook: &(dyn Fn(&PanicInfo<'_>) + Send + Sync + 'static),
               info: &PanicInfo<'_>| {
+            // Lock stderr to prevent interleaving of concurrent panics.
+            let _guard = io::stderr().lock();
+
             // If the error was caused by a broken pipe then this is not a bug.
             // Write the error and return immediately. See #98700.
             #[cfg(windows)]