bpo-42540: reallocation of id_mutex should not force default allocator (GH-29564)
Unlike the other locks reinitialized by _PyRuntimeState_ReInitThreads,
the "interpreters.main->id_mutex" is not freed by _PyRuntimeState_Fini
and should not force the default raw allocator.
(cherry picked from commit 736684b1bb67369a2e95a9f621752deead44e7ef)
Co-authored-by: Sam Gross <colesbury@gmail.com>
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 684e308..0ad13d5 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -4501,6 +4501,22 @@ def test_times(self):
self.assertEqual(times.elapsed, 0)
+@requires_os_func('fork')
+class ForkTests(unittest.TestCase):
+ def test_fork(self):
+ # bpo-42540: ensure os.fork() with non-default memory allocator does
+ # not crash on exit.
+ code = """if 1:
+ import os
+ from test import support
+ pid = os.fork()
+ if pid != 0:
+ support.wait_process(pid, exitcode=0)
+ """
+ assert_python_ok("-c", code)
+ assert_python_ok("-c", code, PYTHONMALLOC="malloc_debug")
+
+
# Only test if the C version is provided, otherwise TestPEP519 already tested
# the pure Python implementation.
if hasattr(os, "_fspath"):