From 5531f66220fde9aee2c15516f9905ecf090a0b30 Mon Sep 17 00:00:00 2001
From: Florian Engelhardt <florian.engelhardt@datadoghq.com>
Date: Tue, 29 Sep 2026 12:10:23 +0200
Subject: [PATCH] Raise test stack for stream error depth limit under MSan

---
 .../stream_errors_operation_depth_limit.phpt  | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/ext/standard/tests/streams/stream_errors_operation_depth_limit.phpt b/ext/standard/tests/streams/stream_errors_operation_depth_limit.phpt
index 1eae9c5fd31d..3c1f934ef30d 100644
--- a/ext/standard/tests/streams/stream_errors_operation_depth_limit.phpt
+++ b/ext/standard/tests/streams/stream_errors_operation_depth_limit.phpt
@@ -2,8 +2,30 @@
 Stream errors: operations refused by the depth limit keep the stack consistent
 --INI--
 zend.max_allowed_stack_size=-1
+--SKIPIF--
+<?php
+if (getenv('SKIP_MSAN')) {
+    if (!function_exists('posix_setrlimit') || !defined('POSIX_RLIMIT_STACK')) {
+        die('skip MSan needs a larger C stack');
+    }
+    [, $hard] = posix_getrlimit(POSIX_RLIMIT_STACK);
+    if (($hard !== 'unlimited' && $hard < 32 * 1024 * 1024)
+        || !posix_setrlimit(POSIX_RLIMIT_STACK, 32 * 1024 * 1024, $hard === 'unlimited' ? -1 : $hard)) {
+        die('skip MSan needs a larger C stack');
+    }
+}
+?>
 --FILE--
 <?php
+// MSan needs more stack to reach the stream error operation limit.
+if (getenv('SKIP_MSAN') && function_exists('posix_setrlimit') && defined('POSIX_RLIMIT_STACK')) {
+    [$soft, $hard] = posix_getrlimit(POSIX_RLIMIT_STACK);
+    if ($soft !== 'unlimited' && $soft < 32 * 1024 * 1024
+        && ($hard === 'unlimited' || $hard >= 32 * 1024 * 1024)) {
+        posix_setrlimit(POSIX_RLIMIT_STACK, 32 * 1024 * 1024, $hard === 'unlimited' ? -1 : $hard);
+    }
+}
+
 class RecursiveStream
 {
     public $context;