New submission from Xiang Zhang:

Just as the patch shows, when PyErr_Occurred() returns true mod is NULL, then 
Py_INCREF(mod) will crash. Replace it with Py_XINCREF.

----------
components: Interpreter Core
files: create_builtin.patch
keywords: patch
messages: 274007
nosy: brett.cannon, eric.snow, ncoghlan, xiang.zhang
priority: normal
severity: normal
status: open
title: Py_INCREF(NULL) in _imp.create_builtin
type: crash
versions: Python 3.5, Python 3.6
Added file: http://bugs.python.org/file44292/create_builtin.patch

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<http://bugs.python.org/issue27909>
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