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In the 3.9 branch, the commit 4d2cfd354969590ba8e0af0447fd84f8b5e61952 fixed the _asyncio extension. win_py399_crash_reproducer.py still branch on Windows in the 3.9 branch. The code can be simplified with:
 code = "import _sre"
Moreover, even if I modify PyInit__sre() to only call PyModule_Create(), it does still crash. I can still reproduce the crash with the following simplified _sre.c code:
---
static PyMethodDef _functions[] = {
 _SRE_COMPILE_METHODDEF
 {NULL, NULL}
};
static struct PyModuleDef sremodule = {
 PyModuleDef_HEAD_INIT,
 "_" SRE_MODULE,
 NULL,
 -1,
 _functions,
 NULL,
 NULL,
 NULL,
 NULL
};
PyMODINIT_FUNC PyInit__sre(void)
{
 return PyModule_Create(&sremodule);
}
---
If _SRE_COMPILE_METHODDEF is removd from _functions, the script no longer crash.
Is there something specific about method objects? Is it safe to share them between multiple interpreters? See my message msg408662 which gives some details.