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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`pythonrun.c`: main_module ref leak in `_PyRun_SimpleStringFlagsWithName`","articleBody":"# Bug report\n\n### Bug description:\n\n# Bug report\n### Bug description:\nThis is a sub-issue for #146102 and original gist details can be found [here](https://gist.github.com/devdanzin/86eda5ca53243ef667773991312c2e74)\n\nExisting code:\n```C\nint\n_PyRun_SimpleStringFlagsWithName(const char *command, const char* name, PyCompilerFlags *flags) {\n    PyObject *main_module = PyImport_AddModuleRef(\"__main__\");\n    if (main_module == NULL) {\n        return -1;\n    }\n    PyObject *dict = PyModule_GetDict(main_module);  // borrowed ref\n\n    PyObject *res = NULL;\n    if (name == NULL) {\n        res = PyRun_StringFlags(command, Py_file_input, dict, dict, flags);\n    } else {\n        PyObject* the_name = PyUnicode_FromString(name);\n        if (!the_name) {\n            PyErr_Print();\n            return -1;\n        }\n        res = _PyRun_StringFlagsWithName(command, the_name, Py_file_input, dict, dict, flags, 0);\n        Py_DECREF(the_name);\n    }\n    Py_DECREF(main_module);\n    if (res == NULL) {\n        PyErr_Print();\n        return -1;\n    }\n\n    Py_DECREF(res);\n    return 0;\n}\n```\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nWindows\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-146356\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/A0su","@type":"Person","name":"A0su"},"datePublished":"2026-03-24T02:58:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/146355/cpython/issues/146355"}