⚠️ CI failed on Wheel builder (last failure: Dec 26, 2025) ⚠️

**CI is still failing on [Wheel builder](https://github.com/scikit-learn/scikit-learn/actions/runs/20515594700)** (Dec 26, 2025)

COMMENT:
Another issue on Windows arm64 with free-threaded: fatal exception with cp314 [build log](https://github.com/scikit-learn/scikit-learn/actions/runs/18423960080/job/52502560141). This one does not seem related to warnings compared to the cp313t one.

```
  tests\test_random_projection.py ........................................ [ 88%]
  ........................................................................ [ 88%]
  ........................................................................ [ 88%]
  .......................................................                  [ 88%]
  tree\tests\test_export.py ..........sssss                                [ 88%]
  tree\tests\test_monotonic_tree.py ...................................... [ 88%]
  ........................................................................ [ 89%]
  Windows fatal exception: access violation
  
  Thread 0x0000187c (most recent call first):
    File "C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonarm64.3.14.0-rc3\tools\Lib\threading.py", line 369 in wait
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\joblib\externals\loky\backend\queues.py", line 147 in _feed
    File "C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonarm64.3.14.0-rc3\tools\Lib\threading.py", line 1023 in run
    File "C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonarm64.3.14.0-rc3\tools\Lib\threading.py", line 1081 in _bootstrap_inner
    File "C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonarm64.3.14.0-rc3\tools\Lib\threading.py", line 1043 in _bootstrap
  
  Thread 0x0000067c (most recent call first):
    File "C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonarm64.3.14.0-rc3\tools\Lib\multiprocessing\connection.py", line 1045 in _exhaustive_wait
    File "C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonarm64.3.14.0-rc3\tools\Lib\multiprocessing\connection.py", line 1113 in wait
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\joblib\externals\loky\process_executor.py", line 681 in wait_result_broken_or_wakeup
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\joblib\externals\loky\process_executor.py", line 623 in run
    File "C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonarm64.3.14.0-rc3\tools\Lib\threading.py", line 1081 in _bootstrap_inner
    File "C:\Users\runneradmin\AppData\Local\pypa\cibuildwheel\Cache\nuget-cpython\pythonarm64.3.14.0-rc3\tools\Lib\threading.py", line 1043 in _bootstrap
  
  Current thread 0x00000730 (most recent call first):
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\sklearn\tree\_classes.py", line 475 in _fit
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\sklearn\tree\_classes.py", line 1407 in fit
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\sklearn\base.py", line 1336 in wrapper
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\sklearn\tree\tests\test_monotonic_tree.py", line 511 in test_nd_tree_nodes_values
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\python.py", line 157 in pytest_pyfunc_call
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_callers.py", line 121 in _multicall
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_hooks.py", line 512 in __call__
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\python.py", line 1671 in runtest
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\runner.py", line 178 in pytest_runtest_call
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_callers.py", line 121 in _multicall
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_hooks.py", line 512 in __call__
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\runner.py", line 246 in <lambda>
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\runner.py", line 344 in from_call
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\runner.py", line 245 in call_and_report
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\runner.py", line 136 in runtestprotocol
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\runner.py", line 117 in pytest_runtest_protocol
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_callers.py", line 121 in _multicall
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_hooks.py", line 512 in __call__
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\main.py", line 367 in pytest_runtestloop
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_callers.py", line 121 in _multicall
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_hooks.py", line 512 in __call__
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\main.py", line 343 in _main
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\main.py", line 289 in wrap_session
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\main.py", line 336 in pytest_cmdline_main
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_callers.py", line 121 in _multicall
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_manager.py", line 120 in _hookexec
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\pluggy\_hooks.py", line 512 in __call__
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\config\__init__.py", line 175 in main
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Lib\site-packages\_pytest\config\__init__.py", line 201 in console_main
    File "C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk\cp314-win_arm64\venv-test\Scripts\pytest.exe\__main__.py", line 6 in <module>
    File "<frozen runpy>", line 88 in _run_code
    File "<frozen runpy>", line 198 in _run_module_as_main
  
  Current thread's C stack trace (most recent call first):
    <cannot get C stack on this system>
  C:\a\scikit-learn\scikit-learn/build_tools/github/test_windows_wheels.sh: line 38:   833 Segmentation fault      pytest --pyargs sklearn
  Warning: cibuildwheel: Can't delete temporary folder 'C:\Users\runneradmin\AppData\Local\Temp\cibw-run-mc25gkqk'
  
  Error: cibuildwheel: Command bash C:\a\scikit-learn\scikit-learn/build_tools/github/test_windows_wheels.sh 314 C:\a\scikit-learn\scikit-learn win_arm64 failed with code 139. 
  
  ............................::endgroup::Testing wheel...
```

Labels: Bug