triton-llvm: fix nondeterministic hang

Author: stephen-huan

pkgs/by-name/tr/triton-llvm/llvm-exegesis-timeout.patch

@@ -0,0 +1,27 @@
+From 705ba309ccebb0f505107a83542ff13d555008e0 Mon Sep 17 00:00:00 2001
+From: Stephen Huan <stephen.huan@cgdct.moe>
+Date: Mon, 24 Mar 2025 21:35:42 -0400
+Subject: [PATCH] [llvm-exegesis] Timeout if subprocess executor hangs
+
+The call to llvm_exegesis_exe nondeterministically hangs, causing
+llvm's tests to block. Introduce a timeout when this happens.
+---
+ llvm/test/tools/llvm-exegesis/lit.local.cfg | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/llvm/test/tools/llvm-exegesis/lit.local.cfg b/llvm/test/tools/llvm-exegesis/lit.local.cfg
+index a51a2d73442fa..8b7c13f5eb1b6 100644
+--- a/llvm/test/tools/llvm-exegesis/lit.local.cfg
++++ b/llvm/test/tools/llvm-exegesis/lit.local.cfg
+@@ -24,9 +24,10 @@ def can_use_perf_counters(mode, extra_options=[]):
+             + extra_options,
+             stdout=subprocess.DEVNULL,
+             stderr=subprocess.DEVNULL,
++            timeout=1,
+         )
+         return return_code == 0
+-    except OSError:
++    except (OSError, subprocess.TimeoutExpired):
+         print("could not exec llvm-exegesis")
+         return False
+ 

pkgs/by-name/tr/triton-llvm/package.nix

@@ -94,6 +94,10 @@ stdenv.mkDerivation (finalAttrs: {
       url = "https://github.com/llvm/llvm-project//commit/84837e3cc1cf17ed71580e3ea38299ed2bfaa5f6.patch";
       hash = "sha256-QKa+kyXjjGXwTQTEpmKZx5yYjOyBX8A8NQoIYUaGcIw=";
     })
+    # fix tests nondeterministically hanging
+    # [llvm-exegesis] Timeout if subprocess executor hangs #132861
+    # https://github.com/llvm/llvm-project/pull/132861
+    ./llvm-exegesis-timeout.patch
   ];
 
   nativeBuildInputs =