ipdb breakpoints in async functions hang indefinitely after upgrading to Prefect 3

[etsvetanov]

Bug summary

Using import ipdb; ipdb.set_trace() in a async function hangs indefinitely when prefect imports are present. Using pdb does not result in the same behaviour.

Tested in a docker container python:3.12.2

from prefect import flow, get_run_logger, task
import asyncio

async def fn():
    print('fn() start')
    import ipdb

    ipdb.set_trace()
    print('fn() end')

if __name__ == "__main__":
    asyncio.run(fn())

Running the above script with python script.py will hang indefinitely (after printing fn() start). Removing prefect imports fixes the issue. Normal def functions do not seem affected.

The installed packages are:

anyio==4.6.2.post1
ipdb==0.13.13
ipython==8.29.0
prefect==3.0.11
pytest==8.3.3
pytest-asyncio==0.24.0

Version info

Version:             3.0.11
API version:         0.8.4
Python version:      3.12.2
Git commit:          a17ccfcf
Built:               Thu, Oct 24, 2024 5:36 PM
OS/Arch:             linux/aarch64
Profile:             ephemeral
Server type:         ephemeral
Pydantic version:    2.9.2
Server:
  Database:          sqlite
  SQLite version:    3.40.1

Additional context

No response

[teocns]

Disable printing/logging and if running with pytest use -s addopts