New submission from Elvis Pranskevichus:
The attached example shows that `asyncio.get_event_loop` still returns parent
process' event loop in some cases. It appears that the fix in issue #29703 was
incomplete:
PARENT PID: 21947, LOOP: <_UnixSelectorEventLoop running=True closed=False
debug=False> at 0x7f0fbe7cfd68
WORKER PID: 21948, LOOP: <_UnixSelectorEventLoop running=True closed=False
debug=False> at 0x7f0fbe7cfd68
concurrent.futures.process._RemoteTraceback:
"""
Traceback (most recent call last):
File "/usr/lib64/python3.6/concurrent/futures/process.py", line 175, in
_process_worker
r = call_item.fn(*call_item.args, **call_item.kwargs)
File "test.py", line 13, in worker
return loop.run_until_complete(worker_coro())
File "/usr/lib64/python3.6/asyncio/base_events.py", line 454, in
run_until_complete
self.run_forever()
File "/usr/lib64/python3.6/asyncio/base_events.py", line 408, in run_forever
raise RuntimeError('This event loop is already running')
RuntimeError: This event loop is already running
"""
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "test.py", line 25, in <module>
loop.run_until_complete(main())
File "/usr/lib64/python3.6/asyncio/base_events.py", line 466, in
run_until_complete
return future.result()
File "test.py", line 21, in main
return await loop.run_in_executor(executor, worker)
RuntimeError: This event loop is already running
----------
components: asyncio
files: test.py
messages: 298693
nosy: Elvis.Pranskevichus, yselivanov
priority: normal
severity: normal
status: open
title: Event loop incorrectly inherited in child processes.
type: behavior
versions: Python 3.6
Added file: http://bugs.python.org/file47024/test.py
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30972>
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