diff -r dc407f50e823 Modules/_threadmodule.c
--- a/Modules/_threadmodule.c	Sat Nov 26 13:50:21 2016 +0200
+++ b/Modules/_threadmodule.c	Sun Nov 27 16:32:57 2016 +0900
@@ -1050,12 +1050,16 @@
     }
     if (keyw != NULL && !PyDict_Check(keyw)) {
         PyErr_SetString(PyExc_TypeError,
                         "optional 3rd arg must be a dictionary");
         return NULL;
     }
+    if (_Py_Finalizing != NULL) {
+        PyErr_SetString(ThreadError, "python is finalizing");
+        return NULL;
+    }
     boot = PyMem_NEW(struct bootstate, 1);
     if (boot == NULL)
         return PyErr_NoMemory();
     boot->interp = PyThreadState_GET()->interp;
     boot->func = func;
     boot->args = args;