Asyncio test fails under Win 7

[mansenfranzen]

BPO	34262
Nosy	@pfmoore, @vstinner, @tjguk, @asvetlov, @zware, @1st1, @zooba, @tirkarthi, @mansenfranzen, @iritkatriel
Superseder	bpo-41682: [Windows] : Proactor test_sendfile_close_peer_in_the_middle_of_receiving failure

^{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 = <Date 2021-09-07.16:41:26.160>
created_at = <Date 2018-07-28.12:58:41.466>
labels = ['type-bug', '3.8', 'OS-windows', 'build', 'expert-asyncio']
title = 'Asyncio test fails under Win 7'
updated_at = <Date 2021-09-07.16:41:26.160>
user = 'https://github.com/mansenfranzen'

bugs.python.org fields:

activity = <Date 2021-09-07.16:41:26.160>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2021-09-07.16:41:26.160>
closer = 'iritkatriel'
components = ['Build', 'Windows', 'asyncio']
creation = <Date 2018-07-28.12:58:41.466>
creator = 'pansen'
dependencies = []
files = []
hgrepos = []
issue_num = 34262
keywords = []
message_count = 5.0
messages = ['322558', '322563', '326476', '401282', '401304']
nosy_count = 10.0
nosy_names = ['paul.moore', 'vstinner', 'tim.golden', 'asvetlov', 'zach.ware', 'yselivanov', 'steve.dower', 'xtreak', 'pansen', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '41682'
type = 'behavior'
url = 'https://bugs.python.org/issue34262'
versions = ['Python 3.8']

[mansenfranzen]

When running tests I encounter the following error for the test:

test_sock_sendfile_not_regular_file (test.test_asyncio.test_proactor_events.ProactorEventLoopUnixSockSendfileTests)

---------------------------
Microsoft Visual C++ Runtime Library
---------------------------
Debug Assertion Failed!

Program: ...\EP2018\cpython\PCbuild\win32\python_d.exe
File: minkernel\crts\ucrt\src\appcrt\lowio\osfinfo.cpp
Line: 257

Expression: fh >= 0 && (unsigned)fh < (unsigned)_nhandle

---------------------------

However, when ignoring the MSCR error, the tests succeed without failing.

In addition the following failed (but not consistently):

======================================================================
FAIL: test_sendfile_close_peer_in_the_middle_of_receiving (test.test_asyncio.test_events.ProactorEventLoopTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "C:\Users\woellert\Desktop\EP2018\cpython\lib\test\test_asyncio\test_events.py", line 2510, in test_sendfile_close_peer_in_the_middle_of_receiving
    self.file.tell())
AssertionError: False is not true : 131072

---

Specs: Windows 7 SP1 64bit,

Process:

• Cloned master from github
• Installed Visual Studio 2017 Community
• Compiled with PCbuild\build.bat -e -d (also used 64bit via -p x64)
• Ran tests with python.bat -m test.test_asyncio -v

[mansenfranzen]

Regarding the MVSC runtime message, there is an issue already here:

https://bugs.python.org/issue23919

[tirkarthi]

ProactorEventLoop is the default event loop with bpo-34687. There doesn't seem to be any warnings in buildbots as I have checked and as @panesen has mentioned this is not consistent. I am adding Victor as a notification if he has any thoughts. Victor, feel free to remove yourself if this is not relevant.

Thanks

[iritkatriel]

Changing type since the crash was fixed under bpo-23919.

There remains (possibly) the failure of test_sendfile_close_peer_in_the_middle_of_receiving.

[vstinner]

test_sendfile_close_peer_in_the_middle_of_receiving() failure is tracked by bpo-41682.