From 2a8a5a2cbd73c081ea5dad6b99b9736086db8f5a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Sun, 4 Jan 2026 14:55:47 +0100
Subject: [PATCH 1/3] gh-143309: fix
 `test_execve_env_concurrent_mutation_with_fspath_posix` buildbot failure

---
 Lib/test/test_os/test_os.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Lib/test/test_os/test_os.py b/Lib/test/test_os/test_os.py
index 67ab945101149d..f1592aa7ee9356 100644
--- a/Lib/test/test_os/test_os.py
+++ b/Lib/test/test_os/test_os.py
@@ -2627,6 +2627,8 @@ def test_execve_invalid_env(self):
     # See https://github.com/python/cpython/issues/137934 and the other
     # related issues for the reason why we cannot test this on Windows.
     @unittest.skipIf(os.name == "nt", "POSIX-specific test")
+    @unittest.skipUnless(unix_shell and os.path.exists(unix_shell),
+                        "requires a shell")
     def test_execve_env_concurrent_mutation_with_fspath_posix(self):
         # Prevent crash when mutating environment during parsing.
         # Regression test for https://github.com/python/cpython/issues/143309.
@@ -2648,9 +2650,9 @@ def __len__(self): return 1
             def keys(self): return KEYS
             def values(self): return VALUES
 
-        args = [sys.executable, '-c', "print({message!r})"]
+        args = [{unix_shell!r}, '-c', 'echo \"{message!s}\"']
         os.execve(args[0], args, MyEnv())
-        """.format(message=message)
+        """.format(unix_shell=unix_shell, message=message)
 
         # Use '__cleanenv' to signal to assert_python_ok() not
         # to do a copy of os.environ on its own.

From 448612bd78b45668159948818ea564d09c6be959 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Sun, 4 Jan 2026 16:37:19 +0100
Subject: [PATCH 2/3] fix missing LD_* vars

---
 Lib/test/test_os/test_os.py | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Lib/test/test_os/test_os.py b/Lib/test/test_os/test_os.py
index f1592aa7ee9356..8df5d54b4026d2 100644
--- a/Lib/test/test_os/test_os.py
+++ b/Lib/test/test_os/test_os.py
@@ -2654,9 +2654,13 @@ def values(self): return VALUES
         os.execve(args[0], args, MyEnv())
         """.format(unix_shell=unix_shell, message=message)
 
-        # Use '__cleanenv' to signal to assert_python_ok() not
-        # to do a copy of os.environ on its own.
-        rc, out, _ = assert_python_ok('-c', code, __cleanenv=True)
+        # Make sure to forward "LD_*" variables so that assert_python_ok()
+        # can run correctly.
+        minimal = {k: v for k, v in os.environ.items() if k.startswith("LD_")}
+        with os_helper.EnvironmentVarGuard() as env:
+            env.clear()
+            env.update(minimal)
+            rc, out, _ = assert_python_ok('-c', code, **env)
         self.assertEqual(rc, 0)
         self.assertIn(bytes(message, "ascii"), out)
 

From 7d741e654e8c6c9d9fb7aaad865d77b872f27892 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?B=C3=A9n=C3=A9dikt=20Tran?=
 <10796600+picnixz@users.noreply.github.com>
Date: Sun, 4 Jan 2026 16:37:46 +0100
Subject: [PATCH 3/3] remove redundant check

---
 Lib/test/test_os/test_os.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Lib/test/test_os/test_os.py b/Lib/test/test_os/test_os.py
index 8df5d54b4026d2..82c55c8ba33065 100644
--- a/Lib/test/test_os/test_os.py
+++ b/Lib/test/test_os/test_os.py
@@ -2660,8 +2660,7 @@ def values(self): return VALUES
         with os_helper.EnvironmentVarGuard() as env:
             env.clear()
             env.update(minimal)
-            rc, out, _ = assert_python_ok('-c', code, **env)
-        self.assertEqual(rc, 0)
+            _, out, _ = assert_python_ok('-c', code, **env)
         self.assertIn(bytes(message, "ascii"), out)
 
     @unittest.skipUnless(sys.platform == "win32", "Win32-specific test")