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Debugger "stop" button does not work for python3.14 multiprocessing subprocess #876

@BigodF

Description

@BigodF

vscode version:

Version: 1.106.2
Commit: 1e3c50d64110be466c0b4a45222e81d2c9352888
Date: 2025-11-19T16:56:50.023Z
Electron: 37.7.0
ElectronBuildId: 12781156
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 25.1.0

pyhton-debugger version:

Name: Python Debugger
Id: ms-python.debugpy
Description: Python Debugger extension using debugpy.
Version: 2025.16.0
Publisher: Microsoft
VS Marketplace Link: https://marketplace.visualstudio.com/items?itemName=ms-python.debugpy

reproduct

code

import multiprocessing, time
from concurrent.futures import ProcessPoolExecutor
def task():
    time.sleep(1) # add a break point hear, and click the stop button when debuging, subprocess still continued, and print 1.
    print('1')
    return 1

def test1():
    with ProcessPoolExecutor(1) as pool:
        r = pool.submit(
            task,
        )
    print('done') # # add a break point hear, and click the stop button when debuging, main process stoped.
if __name__ == '__main__':
    test1()

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