`python -m asyncio ps` shows tasks from only one interpreter

[deadlovelll]

Bug report

python -m asyncio ps shows tasks from only one interpreter, so the main interpreter's tasks disappear once a subinterpreter exists

Repro:

import asyncio, os
from concurrent.futures import InterpreterPoolExecutor

def in_subinterpreter():
    import asyncio

    async def sub_main():
        await asyncio.sleep(10_000)

    asyncio.run(sub_main())

async def main():
    loop = asyncio.get_running_loop()
    loop.run_in_executor(InterpreterPoolExecutor(), in_subinterpreter)
    await asyncio.sleep(1)
    print(os.getpid(), flush=True)
    await asyncio.sleep(10_000)

asyncio.run(main())

Run:

sudo ./python.exe -m asyncio ps <PID>

Actual output:

tid        task id              task name            coroutine stack                                    awaiter chain                                      awaiter name    awaiter id
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
20354601   0x1049c94f0          Task-1               sleep -> in_subinterpreter.<locals>.sub_main                                                                          0x0

Expected:

tid        task id              task name            coroutine stack                                    awaiter chain                                      awaiter name    awaiter id
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
20352316   0x106be14f0          Task-1               sleep -> in_subinterpreter.<locals>.sub_main                                                                          0x0
20352315   0x105f64f50          Task-1               sleep -> main                                                                                                         0x0

Proposed fix: add per-interpreter traversal in _remote_debugging_RemoteUnwinder_get_all_awaited_by_impl

I have a fix ready

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS