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Segfault when trying to use PyRun_SimpleString() with some imports #124160

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@luk1337

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@luk1337

Crash report

What happened?

I hit the segfault when doing the following thing:

$ docker run -ti fedora:41 bash# dnf -y install gcc python-devel# echo '#include <Python.h>int main() {    Py_Initialize();    PyThreadState_Swap(Py_NewInterpreter());    PyRun_SimpleString("import readline");}' > test.c# gcc test.c -I/usr/include/python3.13 -lpython3.13# ./a.out Segmentation fault (core dumped)
Program received signal SIGSEGV, Segmentation fault.0x00007ffff7a8c3cb in reload_singlephase_extension (tstate=tstate@entry=0x7ffff7e5a850, cached=cached@entry=0x0,     info=info@entry=0x7fffffff8c90) at /usr/src/debug/python3.13-3.13.0~rc2-1.fc41.x86_64/Python/import.c:17631763    PyModuleDef *def = cached->def;

The same code doesn't crash on 3.12.

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Output from running 'python -VV' on the command line:

Python 3.13.0rc2 (main, Sep 7 2024, 00:00:00) [GCC 14.2.1 20240801 (Red Hat 14.2.1-1)]

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