Cannot properly close terminated process

[hniksic]

BPO	35539
Nosy	@hniksic, @asvetlov, @1st1
Files	terminate.py

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-12-19.20:35:51.984>
labels = ['3.7', 'expert-asyncio']
title = 'Cannot properly close terminated process'
updated_at = <Date 2018-12-19.20:35:51.984>
user = 'https://github.com/hniksic'

bugs.python.org fields:

activity = <Date 2018-12-19.20:35:51.984>
actor = 'hniksic'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['asyncio']
creation = <Date 2018-12-19.20:35:51.984>
creator = 'hniksic'
dependencies = []
files = ['48008']
hgrepos = []
issue_num = 35539
keywords = []
message_count = 1.0
messages = ['332165']
nosy_count = 3.0
nosy_names = ['hniksic', 'asvetlov', 'yselivanov']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue35539'
versions = ['Python 3.7']

[hniksic]

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.

[kumaraditya303]

Duplicate of #88050