[New-bugs-announce] [issue35539] Cannot properly close terminated process

[Hrvoje Nikšić]

New submission from Hrvoje Nikšić <hniksic at gmail.com>:

It seems impossible to correctly close() an asyncio Process on which terminate has been invoked. Take the following coroutine:

async def test():
    proc = await asyncio.create_subprocess_shell(
        "sleep 1", stdout=asyncio.subprocess.PIPE)
    proc.terminate()
    await proc.wait()

After running it with asyncio.run(), Python prints a warning about "Event loop is closed" exception ignored in BaseSubprocessTransport.__del__. The code does wait for the process to exit, and neither proc nor proc.stdout have a close() method, so the warning seems spurious.

Commenting out proc.terminate() makes the program finish without an exception (but then it waits for a full second, of course).

Runnable example attached.

----------
components: asyncio
files: terminate.py
messages: 332165
nosy: asvetlov, hniksic, yselivanov
priority: normal
severity: normal
status: open
title: Cannot properly close terminated process
versions: Python 3.7
Added file: https://bugs.python.org/file48008/terminate.py

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35539>
_______________________________________