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Segmentation fault on Windows in Python 3.14.0rc1 when running xdoctest test suite via pytest #137384

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3.14bugs and security fixes3.15new features, bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)release-blockertype-crashA hard crash of the interpreter, possibly with a core dump
@Erotemic

Description

@Erotemic

Bug report

Bug description:

I'm working to test my packages against 3.14 before it is released, and I'm seeing an error inxdoctest. Specifically, I see a segmentation fault (exit code 139) on Python 3.14.0rc1 on Windows during CI. The test suite passes on all other platforms and Python versions.

I unfortunately don't have a local Windows machine to further debug this, but here's the GitHub Actions job showing the issue:

https://github.com/Erotemic/xdoctest/actions/runs/16727556954/job/47347171954

and here is the parent run where I've done a little initial debugging

https://github.com/Erotemic/xdoctest/actions/runs/16727556954

I've found that this is likely not a problem in xdoctest, as it only occurs when the optional packages are installed. These are listed in details:

Details

optional.txt:

-r colors.txt-r jupyter.txtpyflakes >= 2.2.0# xdev availpkg tomlitomli>=0.2.0  ; python_version < '3.11.0' and python_version >= '3.6'    # Python 3.6+

jupyter.txt

nbconvert>=6.1.0;  python_version >= '3.7.0' and platform_python_implementation != "PyPy"  # Python 3.7+# For nbconvertjinja2>=3.0.0   ; platform_python_implementation != "PyPy"  # Python 3.6+jupyter_client>=7.0.0 IPython>=7.23.1 # Requires psutil? Breaking on pypy windows?ipykernel>=6.11.0    ; python_version < '4.0'  and python_version >= '3.12' and (platform_system!="Windows" or platform_python_implementation != "PyPy")   # Python 3.12+ipykernel>=6.0.0     ; python_version < '3.12' and python_version >= '3.7' and (platform_system!="Windows" or platform_python_implementation != "PyPy")   # Python 3.7-3.11# For IPython-kerneldebugpy>=1.6.0     ;                            python_version >= '3.10'    # Python 3.10+debugpy>=1.3.0     ; python_version < '3.10' and python_version >= '3.9'    # Python 3.9debugpy>=1.0.0     ; python_version < '3.9' and python_version >= '3.8'    # Python 3.8# Needed for 3.10 tests# Needed for earlier versions of nbconvertipython_genutils >= 0.2.0 ;  platform_python_implementation != "PyPy"    # Python 3.10+# For IPythonjedi>=0.16  attrs>=19.2.0# For jupyter-clientjupyter_core >= 4.7.0

and colors.txt:

Pygments >= 2.15.1colorama >= 0.4.1;platform_system=="Windows"

I will attempt to debug this further as I have time, but I at least wanted to raise the issue in case it helps with the 3.14 release.

CPython versions tested on:

3.14

Operating systems tested on:

Windows

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