`test_free_threading.test_monitoring` flaky (occasional reference leak)

Bug report

When running ./python -E -m test --timeout=2700 -R3:3 -u-cpu -j40 test_free_threading.test_monitoring -F, I get a failure every ~50-100 test runs:

0:00:36 load avg: 122.12 [ 55/1] test_free_threading.test_monitoring failed (reference leak)
beginning 6 repetitions. Showing number of leaks (. for 0 or less, X for 10 or more)
123:456
XX. 243
test_free_threading.test_monitoring leaked [2, 4, 3] memory blocks, sum=9

I think the issue is that we rely on Thread.is_alive() instead of joining the threads. I think there are still some objects that may not be freed until the thread is joined (like the handle):

https://github.com/python/cpython/blob/cb59eaefeda5ff44ac0c742bff2b8afc023be313/Lib/test/test_free_threading/test_monitoring.py#L65-L77

Linked PRs

• gh-136896
• gh-141832

Inizia da Lib/test/test_free_threading/test_monitoring.py intorno alle righe 65-77 e riproduci la perdita usando il comando nel report. Controlla lì la pulizia dei thread, quindi esegui nuovamente il test ripetuto per confermare che la perdita di riferimenti non si verifica più; le PR collegate gh-136896 e gh-141832 indicano che il lavoro è già stato spostato altrove.