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Description
Bug summary
Running ft2font import through pytest with pytest-cov plugin causes Python to crash.
Code for reproduction
MRE:
frommatplotlibimportft2fontdeftest_dummy():passprint('unreachable')
Env:
python3 -m venv ./venvsource ./venv/bin/activate.fishpip install matplotlib pytest pytest-covpytest ./segft2.py
Actual outcome
====================================== test session starts =======================================platform linux -- Python 3.13.3, pytest-8.3.5, pluggy-1.5.0rootdir: /home/mmatous/playground/segft2plugins: cov-6.1.1collecting ... fish: Job 1, 'pytest ./segft2.py' terminated by signal SIGSEGV (Address boundary error)
Expected outcome
====================================== test session starts =======================================platform linux -- Python 3.13.3, pytest-8.3.5, pluggy-1.5.0rootdir: /home/mmatous/playground/segft2collected 1 itemsegft2.py . [100%]======================================= 1 passed in 0.09s ========================================
Additional information
- Uninstalling pytest-cov makes dummy test pass.
- matplotlib-3.9.4 is unaffected.
- matplotlib-3.10.0 is affected.
- main HEAD (828ec6f) is affected.
- Persists even after copying system ft2font.*.so into venv (so not simply broken wheels).
Possibly not related to pytest specifically, but being run as subprocess or being loaded multiple times in general?I encounter the same problem when trying to build doc. withtox run -e docs-dev
while setting uphttps://pydata-sphinx-theme.readthedocs.io/en/latest/community/setup.html#build-the-documentation where MPL is a dependency.CPU: AMD Ryzen 9 7950X (in case it's some weird hw/simd/optimization thing)- Feel free to ask for more info, I don't know much about debugging C/Python boundary, so for now here's an LLDB backtrace:
(lldb) bt* thread #1, name = 'pytest', stop reason = SIGSEGV: address not mapped to object (fault address=0x0) * frame #0: 0x0000000000000000 frame #1: 0x00007f211fd9dc00 libunwind.so.8`_ULx86_64_dwarf_find_proc_info(as=0x00007ffd900eb900, ip=140727020337416, pi=0x00007ffd900eb958, need_unwind_info=1, arg=<unavailable>) at Gfind_proc_info-lsb.c:807:9 frame #2: 0x00007f211fd9e817 libunwind.so.8`fetch_proc_info(c=0x00007ffd900eb800, ip=<unavailable>) at Gparser.c:473:18 frame #3: 0x00007f211fd96e73 libunwind.so.8`_Unwind_GetLanguageSpecificData [inlined] _ULx86_64_dwarf_make_proc_info(c=<unavailable>) at Gparser.c:1089:9 frame #4: 0x00007f211fd96e61 libunwind.so.8`_Unwind_GetLanguageSpecificData [inlined] _ULx86_64_get_proc_info(cursor=<unavailable>, pi=<unavailable>) at Gget_proc_info.c:35:7 frame #5: 0x00007f211fd96e61 libunwind.so.8`_Unwind_GetLanguageSpecificData(context=<unavailable>) at GetLanguageSpecificData.c:34:3 frame #6: 0x00007f211eee32dd libstdc++.so.6`__gxx_personality_v0 + 285 frame #7: 0x00007f211fd7f6dc libgcc_s.so.1`___lldb_unnamed_symbol337 + 156 frame #8: 0x00007f211fd80001 libgcc_s.so.1`_Unwind_Resume + 161 frame #9: 0x00007f20ca1fb720 ft2font.cpython-313-x86_64-linux-gnu.so`ft2font__getattr__(std::string) (.lto_priv.0.cold) + 81 frame #10: 0x00007f20ca2351c6 ft2font.cpython-313-x86_64-linux-gnu.so`void pybind11::cpp_function::initialize<pybind11::object (*&)(std::string), pybind11::object, std::string, pybind11::name, pybind11::scope, pybind11::sibling>(pybind11::object (*&)(std::string), pybind11::object (*)(std::string), pybind11::name const&, pybind11::scope const&, pybind11::sibling const&)::'lambda1'(pybind11::detail::function_call&)::_FUN(pybind11::detail::function_call&) + 454 frame #11: 0x00007f20ca20ba3d ft2font.cpython-313-x86_64-linux-gnu.so`pybind11::cpp_function::dispatcher(_object*, _object*, _object*) + 3373 frame #12: 0x00007f21219587f7 libpython3.13.so.1.0`cfunction_call(func=0x00007f20ca3c3880, args=0x0000000000000000, kwargs=0x0000000000000000) at methodobject.c:540:18
Operating system
Gentoo
Matplotlib Version
3.10.1
Matplotlib Backend
tkagg
Python version
Python 3.13.3
Jupyter version
No response
Installation
pip
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