Bug report

Bug description:

I have a single threading.Timer held on a class as self.timer...

defrefresh_timer(self):ifself.timerisnotNone:self.timer.cancel()self.timer=threading.Timer(self.worker_context.timeout_minutes*60,self.stop_cycle)self.timer.start()

As recently as 3.10 this code worked. As of 3.12 it errors with "can't create new thread at interpreter shutdown". The code has not changed, and the interpreter is not shutting down at the time this error is thrown, as in the process is live and code is executing. There are no code changes from where this is working in 3.10 to where it is not in3.12.1 (upgraded from 3.12 to 3.12.1 and tsted again to see if this had been fixed).

CPython versions tested on:

3.12

Operating systems tested on:

Windows

Linked PRs

• gh-113964: Don't prevent new threads until all non-daemon threads exit #116677
• gh-113964: Restore the ability to start threads from atexit handler functions. #116982
• [3.12] gh-113964: Don't prevent new threads until all non-daemon threads exit (GH-116677) #117029