bpo-43551: fix PyImport_Import use static silly_list, under building Python with --with-experimental-isolated-subinterpreters share silly_list in multi sub interpreters cause crash.#24929
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JunyiXie requested review from brettcannon, encukou, ericsnowcurrently, ncoghlan and warsaw as code owners
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JunyiXie commented Mar 19, 2021
Hello, this change seems might not need to update news. |
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"silly list" is not a great name, I propose to rename it to "from_list".
Also you must put a DECREF somewhere, otherwise the code will leak.
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--with-experimental-isolated-subinterpreters option is supposed to remain secret!
Either remove your NEWS entry, or just say "subinterpreters". For example, "Fix the import function for subinterpreters." I'm not sure that it's worth it to document every single subinterpreter fix.
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Comment on lines 1749 to 1750
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static variables are bad, they don't work in subinterpreters. You can use the _Py_IDENTIFIER() API with _PyUnicode_FromId() (return a borrowed reference), it is compatible with subinterpreters.
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@vstinner thanks for your review. I have fix these problems. |
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Oh, it's way better, thanks! I have remarks on the coding style.
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You can define the variable here (same for the 2 other variables) and add a comment to mention that it's a borrowed ref
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| import_str=_PyUnicode_FromId(&PyId___import__); | |
| PyObject*import_str=_PyUnicode_FromId(&PyId___import__);// borrowed ref |
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There is a refleak (unrelated to your PR) at:
/* No globals -- use standard builtins, and fake globals */ builtins = PyImport_ImportModuleLevel("builtins", NULL, NULL, NULL, 0); if (builtins == NULL) return NULL; // <=== HERE Please replace return NULL with goto err and add braces (PEP 7).
You may also replace return NULL with goto err at:
PyObject *from_list = PyList_New(0); if (from_list == NULL){return NULL} You might also remove trailing spaces at line 1761 :-D (my text editor highlights them ;-))
under building Python with --with-experimental-isolated-subinterpreters share silly_list in multi subinterpreters cause crash.
bedevere-bot commented Mar 22, 2021
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https://bugs.python.org/issue43551
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
https://bugs.python.org/issue43551