Issue 30423: [asyncio] orphan future close loop and cause "RuntimeError: Event loop stopped before Future completed."

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This issue has been migrated to GitHub: https://github.com/python/cpython/issues/74608

classification

Title:	[asyncio] orphan future close loop and cause "RuntimeError: Event loop stopped before Future completed."
Type:		Stage:	resolved
Components:	asyncio	Versions:	Python 3.7, Python 3.6, Python 3.5

process

Status:	closed	Resolution:	fixed
Dependencies:		Superseder:
Assigned To:		Nosy List:	asvetlov, jimmylai, lukasz.langa, yselivanov
Priority:	normal	Keywords:

Created on 2017-05-21 13:44 by jimmylai, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Messages (2)
msg294102 - (view)	Author: Jimmy Lai (jimmylai) *	Date: 2017-05-21 13:44
Problem: "RuntimeError: Event loop stopped before Future completed." throws when calling run_until_complete(). We investigate and find out some orphan futures stay in the event loop before we run another run_until_complete(another_async_func()). The orphan future has pending state and is attached with _run_until_complete_cb from previous run_until_complete. It happens because the orphan future thrown Exception and then raise, thus remove_done_callback(_run_until_complete_cb) didn't called. Move it to finally section can fix it. With this patch, we stop seeing the Runtime Error.
msg305382 - (view)	Author: Andrew Svetlov (asvetlov) *	Date: 2017-11-01 13:54
New changeset d1e34031f68a3c7523a5376575c87cd0fea2425c by Andrew Svetlov (jimmylai) in branch 'master': [asyncio] bpo-30423: add regression test for orphan future causes "RuntimeError: Event loop stopped before Future completed." (#3295) https://github.com/python/cpython/commit/d1e34031f68a3c7523a5376575c87cd0fea2425c

History
Date	User	Action	Args
2022-04-11 14:58:46	admin	set	github: 74608
2017-11-01 13:54:48	asvetlov	set	nosy: + asvetlov messages: + msg305382
2017-09-04 19:56:58	jimmylai	set	pull_requests: + pull_request3329
2017-05-23 07:37:31	lukasz.langa	set	status: open -> closed stage: resolved resolution: fixed versions: + Python 3.5, Python 3.7
2017-05-23 06:13:54	lukasz.langa	set	pull_requests: + pull_request1844
2017-05-23 06:09:51	lukasz.langa	set	pull_requests: + pull_request1842
2017-05-23 05:31:27	lukasz.langa	set	nosy: + lukasz.langa
2017-05-21 13:44:28	jimmylai	create