faulthandler.dump_traceback_later() can segfault while another thread frees code metadata #158200

import faulthandler
import os
import threading
import time
import types


stop = threading.Event()


def template():
    return 1


def churn_frames():
    while not stop.is_set():
        code = template.__code__.replace()
        function = types.FunctionType(code, {})
        function()
        function = None
        code = None


worker = threading.Thread(target=churn_frames)
worker.start()

with open(os.devnull, "w") as output:
    faulthandler.dump_traceback_later(1e-6, repeat=True, file=output)
    try:
        time.sleep(1)
    finally:
        faulthandler.cancel_dump_traceback_later()
        stop.set()
        worker.join()

print("completed")