【Thread Leak ?】Unknown Dummy Thread due to the patched subprocess.check_output

[Alex-Beng]

• gevent version: 24.2.1 From PyPI
• Python version: cPython 3.9.13 downloaded from python.org
• Operating System: For example, Windows 10 (10.0.19045.4291 + x86)

Description:

I have a python script, which use subprocess.check_output to check the windows version. Then in the debugging mod, it looks like that it will create a ThreadPool's thread, and the thread can't be killed through gevent.get_hub().threadpool.kill().

I think it may be a kind of Thread Leak ? Or just the gevent feature ?

the reproduce code and result can be seen in microsoft/debugpy#1572

What I've run:

microsoft/debugpy#1572 (comment)