From e153b7a5657273c3b4e6bbc795a4dd37bb2d5218 Mon Sep 17 00:00:00 2001
From: KIMURA Chikahiro <chi-kimura@xr.jp.nec.com>
Date: Mon, 7 Aug 2017 17:48:08 +0900
Subject: Untrack self when deallocating.

Fixes #20
---
 CHANGES.rst                        | 3 +++
 src/zope/proxy/_zope_proxy_proxy.c | 1 +
 2 files changed, 4 insertions(+)

diff --git a/CHANGES.rst b/CHANGES.rst
index 48f0a61..4c0b9a2 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,6 +4,9 @@ Changes
 4.3.0 (unreleased)
 ------------------
 
+- Fix a potential rare crash when deallocating proxies. See `issue 20
+  <https://github.com/zopefoundation/zope.proxy/issues/20>`_.
+
 - Drop support for Python 3.3.
 
 - Drop support for "python setup.py test".
diff --git a/src/zope/proxy/_zope_proxy_proxy.c b/src/zope/proxy/_zope_proxy_proxy.c
index d1c4478..e201337 100644
--- a/src/zope/proxy/_zope_proxy_proxy.c
+++ b/src/zope/proxy/_zope_proxy_proxy.c
@@ -182,6 +182,7 @@ wrap_iternext(PyObject *self)
 static void
 wrap_dealloc(PyObject *self)
 {
+    PyObject_GC_UnTrack(self);
     (void) wrap_clear(self);
     self->ob_type->tp_free(self);
 }
-- 
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