[New-bugs-announce] [issue43551] [Subinterpreters]: PyImport_Import use static silly_list under building Python with --with-experimental-isolated-subinterpreters share silly_list in multi subinterpreters cause crash.

[junyixie]

New submission from junyixie <xie.junyi at outlook.com>:

fix PyImport_Import use static silly_list under building Python with --with-experimental-isolated-subinterpreters share silly_list in multi subinterpreters  cause crash.

Under the sub interpreters parallel, PyObject_CallFunction clean stack, 
Py_DECREF(stack[i]), Py_DECREF silly_list is not thread safe. cause crash
```
PyObject *
PyImport_Import(PyObject *module_name)
{
    PyThreadState *tstate = _PyThreadState_GET();
    static PyObject *silly_list = NULL;
    ...
    /* Initialize constant string objects */
    if (silly_list == NULL) {
        import_str = PyUnicode_InternFromString("__import__");
        if (import_str == NULL)
            return NULL;
        builtins_str = PyUnicode_InternFromString("__builtins__");
        if (builtins_str == NULL)
            return NULL;
        silly_list = PyList_New(0);
        if (silly_list == NULL)
            return NULL;
    }
    ...
    /* Call the __import__ function with the proper argument list
       Always use absolute import here.
       Calling for side-effect of import. */
    r = PyObject_CallFunction(import, "OOOOi", module_name, globals,
                              globals, silly_list, 0, NULL);

```

----------
messages: 389056
nosy: JunyiXie, vstinner
priority: normal
severity: normal
status: open
title: [Subinterpreters]: PyImport_Import use static silly_list under building Python with --with-experimental-isolated-subinterpreters share silly_list in multi subinterpreters  cause crash.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43551>
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