Step Over, Step Into, not working when debugging Subprocesses

[maor-outrival]

When debugging a process in python, the program halts on breakpoints yet only the Continue button works. Pressing Step Over or Step into just Continues to the next breakpoint.

I have tried many launch.json configs and the only thing that resolved my issue was downgrading to v2024.10.0.

here is my config just in case:

 {
 "name": "Python Debugger: Current File",
 "type": "debugpy",
 "request": "launch",
 "program": "app/main.py",
 "console": "integratedTerminal",
 "env": {
 "PYTHONPATH": "${workspaceFolder}"
 },
 "justMyCode": true,
 "subProcess": true,
 "steppingResumesAllThreads": false
 },

[rchiodo]

Can you share your application? This works fine for me with the latest bits.

DebugStepMultiproc.mp4

I used this code here:

import subprocess
import sys
import time

def act_busy():
 # Simulate a busy operation
 print("Subprocess is busy doing something...")
 for i in range(500):
 print(f"Working... {i + 1}/5")
 sys.stdout.flush() # Ensure the output is flushed immediately
 time.sleep(1) # Simulate work with a sleep

 print("Subprocess finished working.")

def run_subprocess():
 # Define the command to run as a subprocess
 command = ['python', __file__, 'act_busy']

 try:
 # Run the subprocess and wait for it to complete
 result = subprocess.run(command, capture_output=True, text=True, check=True)
 
 # Print the output of the subprocess
 print(result.stdout)
 
 # Print success message
 print("Subprocess completed successfully.")
 except subprocess.CalledProcessError as e:
 # Print error message if the subprocess fails
 print(f"Subprocess failed with error: {e}")

if __name__ == "__main__":
 if len(sys.argv) > 1:
 act_busy()
 else:
 run_subprocess()

[github-actions]

This issue was closed because it has been stalled for 30 days with no activity. If the issue still persists, please reopen with the information requested. Thanks.

[SobhanMP]

It's broken, see the following

import time
import multiprocessing as mp

def f():
 for i in range(10):
 time.sleep(1)
 print(i)

if __name__ == "__main__":
 p = mp.Process(target=f)
 p.start()
 p.join()

[rchiodo]

Seems to work fine for me. Although I'm on windows.

DebugMultiproc.mp4

[rchiodo]

I can reproduce on Linux though.

[rchiodo]

Strange but the subprocess example works fine on Linux. Not sure how multiprocess could affect stepping.