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[3.6] bpo-31418: Fix an assertion failure in PyErr_WriteUnraisable() in case of an exception with a bad __module__ attribute. (GH-3539) #3556

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Merged
merged 1 commit into from
Sep 14, 2017
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[3.6] bpo-31418: Fix an assertion failure in PyErr_WriteUnraisable() in case of an exception with a bad __module__ attribute. (GH-3539) #3556

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2017-09-13-13-03-52.bpo-31418.rS-FlC.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix an assertion failure in `PyErr_WriteUnraisable()` in case of an
exception with a bad ``__module__`` attribute. Patch by Oren Milman.
2 changes: 1 addition & 1 deletion Python/errors.c
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Original file line number Diff line number Diff line change
Expand Up @@ -978,7 +978,7 @@ PyErr_WriteUnraisable(PyObject *obj)
}

moduleName = _PyObject_GetAttrId(t, &PyId___module__);
if (moduleName == NULL) {
if (moduleName == NULL || !PyUnicode_Check(moduleName)) {
PyErr_Clear();
if (PyFile_WriteString("<unknown>", f) < 0)
goto done;
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