From 40e70b820c8279396ae7cb075042456a7d1ac313 Mon Sep 17 00:00:00 2001
From: David Lord <davidism@gmail.com>
Date: Fri, 28 Feb 2020 18:50:00 -0800
Subject: [PATCH] better PyObject_HEAD size calculation

fixes infinite loop on Python 3.6 32-bit
---
 CHANGES.rst         | 2 ++
 src/jinja2/debug.py | 5 +----
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index 9635fc55..aee6ad3a 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -10,6 +10,8 @@ Unreleased
     :func:`contextfunction`. :issue:`1145`
 -   Update ``wordcount`` filter to trigger :class:`Undefined` methods
     by wrapping the input in :func:`soft_unicode`. :pr:`1160`
+-   Fix a hang when displaying tracebacks on Python 32-bit.
+    :issue:`1162`
 
 
 Version 2.11.1
diff --git a/src/jinja2/debug.py b/src/jinja2/debug.py
index d2c5a06b..5d8aec31 100644
--- a/src/jinja2/debug.py
+++ b/src/jinja2/debug.py
@@ -245,10 +245,7 @@ else:
     class _CTraceback(ctypes.Structure):
         _fields_ = [
             # Extra PyObject slots when compiled with Py_TRACE_REFS.
-            (
-                "PyObject_HEAD",
-                ctypes.c_byte * (32 if hasattr(sys, "getobjects") else 16),
-            ),
+            ("PyObject_HEAD", ctypes.c_byte * object().__sizeof__()),
             # Only care about tb_next as an object, not a traceback.
             ("tb_next", ctypes.py_object),
         ]
-- 
2.47.2