The dead thread won't disappear in call stack monitor

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#1,572 opened on Apr 28, 2024 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 42/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: python
Domain: devtools

Research direction

Start by running the minimal Python reproduction from the issue with gevent and the described VS Code launch.json configuration on Windows. Inspect how the call stack monitor handles the terminated thread and verify that the dead thread disappears immediately without resizing the stack monitor.

Written by the indexing model from the issue text.

Description

bug

Environment data

debugpy version: 1.8.1, install from PyPI
OS and version: Windows 10.0.19045.4291
Python version cPython 3.9.13 downloaded from python.org
Using VS Code or Visual Studio: VS code

Actual behavior

here is the minest reproduce code:

import gevent
import gevent.monkey; gevent.monkey.patch_all()
import subprocess
import threading

cmd = 'ver'
info = subprocess.check_output(cmd,
                                stdin=subprocess.DEVNULL,
                                stderr=subprocess.DEVNULL,
                                text=True,
                                shell=True)
print(f'{cmd} => {info}')

https://github.com/microsoft/debugpy/assets/30763045/2fdeeaba-f8f7-4895-a3bd-2ece76c4014d

the dead thread won't disappear immediately util the stack monitor ajust size.

Expected behavior

the dead thread should disappear immediately.

Steps to reproduce:

paster the code to file
take the breakpoint
create a python debug config, add gevent needed env to launce.json, then launch.

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Dominant language: Python
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Merged PRs (30d): 1

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