New submission from William Fisher <[email protected]>:
I have a reproducible case where stdin.wait_closed() is hanging on
Windows. This happens in response to a BrokenPipeError. The same code
works fine on Linux and MacOS.
Please see the attached code for the demo.
I believe the hang is related to this debug message from the logs:
DEBUG <_ProactorWritePipeTransport closing fd=632>: Fatal write error on pipe
transport
Traceback (most recent call last):
File
"C:\hostedtoolcache\windows\Python\3.9.6\x64\lib\asyncio\proactor_events.py",
line 379, in _loop_writing
f.result()
File
"C:\hostedtoolcache\windows\Python\3.9.6\x64\lib\asyncio\windows_events.py",
line 812, in _poll
value = callback(transferred, key, ov)
File
"C:\hostedtoolcache\windows\Python\3.9.6\x64\lib\asyncio\windows_events.py",
line 538, in finish_send
return ov.getresult()
BrokenPipeError: [WinError 109] The pipe has been ended
It appears that the function that logs "Fatal write error on pipe transport"
also
calls _abort on the stream. If _abort is called before stdin.close(),
everything is okay.
If _abort is called after stdin.close(), stdin.wait_closed() will hang.
Please see issue #44428 for another instance of a similar hang in wait_closed().
----------
components: asyncio
files: wait_closed.py
messages: 400810
nosy: asvetlov, byllyfish, yselivanov
priority: normal
severity: normal
status: open
title: asyncio hang in subprocess wait_closed() on Windows, BrokenPipeError
type: behavior
versions: Python 3.10, Python 3.9
Added file: https://bugs.python.org/file50250/wait_closed.py
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<https://bugs.python.org/issue45074>
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