`python -m asyncio ps` shows a single frame for the task that is currently running

[deadlovelll]

Bug report

A task that is running is shown with a single frame instead of its call stack.

import asyncio, os, sys

async def coro1():
    return 1

async def c():
    if sys.argv[1] == "spin":
        while True:
            await coro1()
    await asyncio.sleep(100)

async def b(): await c()
async def a(): await b()

async def main():
    print(os.getpid(), flush=True)
    await a()

asyncio.run(main())

Sleep (expected):

./python.exe repro.py sleep

➜  cpython git:(main) ✗ sudo ./python.exe -m asyncio ps 89369
Password:
tid        task id              task name            coroutine stack                                    awaiter chain                                      awaiter name    awaiter id
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
3924274    0x1039d4d70          Task-1               sleep -> c -> b -> a -> main                                                                                          0x0

Spin (actual):

./python.exe repro.py spin

➜  cpython git:(main) ✗ sudo ./python.exe -m asyncio ps 89667
tid        task id              task name            coroutine stack                                    awaiter chain                                      awaiter name    awaiter id
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
3925594    0x105370d70          Task-1               main                                                                                                                  0x0

Proposed fix: For a running task, read the frames from the thread stack, as get_async_stack_trace() already do

I have a fix ready for that

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-158443: Fix asyncio ps showing a running task as a single frame #158449