3.13.7 regression on Windows `ModuleNotFoundError: No module named '_posixsubprocess' `

[zanieb]

Bug report

Bug description:

The following error occurs on 3.13.7 on Windows but not on 3.13.6

    def spawnv_passfds(path, args, passfds):
>       import _posixsubprocess
E       ModuleNotFoundError: No module named '_posixsubprocess'

See reports at

• Issues in resource tracker for Python 3.13.7: ModuleNotFoundError: No module named '_posixsubprocess' on Windows and warnings Cannot register X for automatic cleanup: unknown resource type Y on posix joblib/loky#459
• Windows 3.13.7 build regression ModuleNotFoundError: No module named '_posixsubprocess' astral-sh/python-build-standalone#774

Unfortunately the reports have not yet included a minimal reproduction. The obvious things to try do not reproduce the problem.

This appears to be a regression from

• [3.13] gh-131788: make resource_tracker re-entrant safe (GH-131787) #137738

That change also seems to cause a regression ValueError: Cannot register X for automatic cleanup: unknown resource type Y which is being discussed in

• intermittent ResourceTracker called reentrantly for resource cleanup in tests #131788

but that seems distinct from this error.

CPython versions tested on:

3.13

Operating systems tested on:

Windows

Linked PRs

• [3.13] gh-138031: revert gh-131788 make resource_tracker re-entrant safe #138222

[picnixz]

FTR: The 3.14 backport wasn't merged yet so 3.13 and 3.15 are the only ones that should be (possibly) affected

[picnixz]

cc @graingert