From 0fcc03367b31f44c1e1b8d3d2dd940ef1e744326 Mon Sep 17 00:00:00 2001
From: INADA Naoki <methane@users.noreply.github.com>
Date: Wed, 27 Sep 2017 06:24:16 +0900
Subject: bpo-31095: fix potential crash during GC (GH-2974) (#3196)

(cherry picked from commit a6296d34a478b4f697ea9db798146195075d496c)
---
 Python/Python-ast.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Python/Python-ast.c')

diff --git a/Python/Python-ast.c b/Python/Python-ast.c
index ad53ba3585..d7586f2de0 100644
--- a/Python/Python-ast.c
+++ b/Python/Python-ast.c
@@ -486,6 +486,8 @@ typedef struct {
 static void
 ast_dealloc(AST_object *self)
 {
+    /* bpo-31095: UnTrack is needed before calling any callbacks */
+    PyObject_GC_UnTrack(self);
     Py_CLEAR(self->dict);
     Py_TYPE(self)->tp_free(self);
 }
-- 
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