#🔒 Embedding CPython: Interacting with module seems to trigger segment fault

9 messages · Page 1 of 1 (latest)

brazen urchin
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I'm trying to embed CPython 3.13.9 into my program using Zig. The idea is that I'll import a Python module using PyImport_ImportModule and hold on to it. And later PyObject_GetAttrString and PyObject_CallObject will be used to call functions in the module.

But segment fault occurs when I call PyObject_GetAttrString, and sometimes PyObject_CallObject too (I'm unsure about this because I did changed some stuff when debugging, but I can't recall any changes that might relate to this happening). I'm sure that I didn't call PY_DECREF on the module nor Py_Finalize before trying to call PyObject_GetAttrString and PyObject_CallObject.

I needed to call multiple functions in Python from Zig, at some point I got it to work with the first function call. But later on it somehow stopped working again, and will always crash on the second PyObject_GetAttrString call (segment fault at address 0x0).

Even after hours of research, back and forth with ChatGPT, I still can't figure out why this is happening. Am I miss understand how object or module lifetime work? Any help is appreciated!

proud wigeonBOT
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@brazen urchin

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brazen urchin
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Embedding Python: Interacting with module seems to trigger segment fault

brazen urchin
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Embedding CPython: Interacting with module seems to trigger segment fault

minor falcon
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i'd first check whether the module is null
would be good if you provided a minimal reproducible example

brazen urchin
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As for the minimal example I'll need to do more testing and that might take some time.

proud wigeonBOT
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