Bug report

The ARM64 MacOS M1 Refleaks NoGIL 3.x buildbot started detecting leaks in quite a few tests (test_largefile, test_os, test_pickle, test_posix, test_shutil), see e.g. https://buildbot.python.org/all/#/builders/1368/builds/182

Marking as release blocker since a stable buildbot is failing.
(But, freethreading is still experimental, so I recommend to defer this; it doesn't need to block the alpha.)