commit 2eea952b1b9ebbc2d94fd3faca1536c6b4963725
author INADA Naoki <methane@users.noreply.github.com> Mon Sep 04 12:31:09 2017 +0900
committer GitHub <noreply@github.com> Mon Sep 04 12:31:09 2017 +0900
tree 5262bce350c874f5397b8ad2ca2a6671cb4dd9d6
parent 7d8282d25d4900dd3367daf28bb393be7f276729

bpo-31095: fix potential crash during GC (GH-3195)

(cherry picked from commit a6296d34a478b4f697ea9db798146195075d496c)

Python/Python-ast.c

diff --git a/Python/Python-ast.c b/Python/Python-ast.c
index b78a0fc..212211c 100644
--- a/Python/Python-ast.c
+++ b/Python/Python-ast.c
@@ -512,6 +512,8 @@
 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);
 }