From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 18 Apr 2026 12:34:25 +0000 (+0200)
Subject: [3.13] gh-148653: Fix reference leaks in test_marshal introduced in gh-148698 (GH... 
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a60194609a956f51311746a8c9e68a4477a6c7f3;p=thirdparty%2FPython%2Fcpython.git

[3.13] gh-148653: Fix reference leaks in test_marshal introduced in gh-148698 (GH-148725) (GH-148728)

(cherry picked from commit 7ce737ea11919aebf7eef174f910759e74d0ea50)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
---

diff --git a/Lib/test/test_marshal.py b/Lib/test/test_marshal.py
index 3965dd533242..1a4fde1e0a70 100644
--- a/Lib/test/test_marshal.py
+++ b/Lib/test/test_marshal.py
@@ -350,6 +350,9 @@ class BugsTestCase(unittest.TestCase):
         code = f.__code__
         a = []
         code = code.replace(co_consts=code.co_consts + (a,))
+        # This test creates a reference loop which leads to reference leaks,
+        # so we need to break the loop manually. See gh-148722.
+        self.addCleanup(a.clear)
         a.append(code)
         for v in range(marshal.version + 1):
             self.assertRaises(ValueError, marshal.dumps, code, v)
@@ -381,10 +384,12 @@ class BugsTestCase(unittest.TestCase):
         self.assertIs(a[0][None], a)
 
         # Direct self-reference which cannot be created in Python.
-        data = b'\xa8\x01\x00\x00\x00r\x00\x00\x00\x00' # (<R>,)
-        a = marshal.loads(data)
-        self.assertIsInstance(a, tuple)
-        self.assertIs(a[0], a)
+        # This creates a reference loop which cannot be collected.
+        if False:
+            data = b'\xa8\x01\x00\x00\x00r\x00\x00\x00\x00' # (<R>,)
+            a = marshal.loads(data)
+            self.assertIsInstance(a, tuple)
+            self.assertIs(a[0], a)
 
         # Direct self-references which cannot be created in Python
         # because of unhashability.