PyInterpreterState_New use thread tstate before set.


PyInterpreterState_New use tstate. but tstate is not set.
tstate will set after PyInterpreterState_New.

    PyInterpreterState *interp = PyInterpreterState_New();
    if (interp == NULL) {
        *tstate_p = NULL;
        return _PyStatus_OK();
    }

    PyThreadState *tstate = PyThreadState_New(interp);
    if (tstate == NULL) {
        PyInterpreterState_Delete(interp);
        *tstate_p = NULL;
        return _PyStatus_OK();
    }

    PyThreadState *save_tstate = PyThreadState_Swap(tstate);

PyInterpreterState_New call and use PyThreadState *tstate = _PyThreadState_GET();

_PyRuntime.gilstate.autoTSSkey has to be initialized before pthread_getspecific() or pthread_setspecific() can be used.

_PyRuntime.gilstate.autoTSSkey create in _PyGILState_Init. PyInterpreterState_New called before _PyGILState_Init.

> PyInterpreterState_New call and use PyThreadState *tstate = _PyThreadState_GET();

It is safe to call _PyThreadState_GET() before _PyGILState_Init().

_PyThreadState_GET() calls _Py_atomic_load_relaxed(&_PyRuntime.gilstate.tstate_current), it doesn't use autoTSSkey. Or did I miss something?

Are you building Python with --with-experimental-isolated-subinterpreters?

Yes, this is an issue under building Python with --with-experimental-isolated-subinterpreters

New changeset 87f649a409da9d99682e78a55a83fc43225a8729 by Victor Stinner in branch 'master':
bpo-43311: Create GIL autoTSSkey ealier (GH-24819)
https://github.com/python/cpython/commit/87f649a409da9d99682e78a55a83fc43225a8729

Thanks for your bug report junyixie, it should now be fixed. See bpo-40522 for the follow up.