[issue20720] test_create_server() of test_asyncio failure on "x86 Windows Server 2008 [SB] 3.x" buildbot

[STINNER Victor]

New submission from STINNER Victor:

It looks like the overlapped AcceptEx() operation was cancelled by something. But when the test_asyncio was replayed in verbose mode, the test passed.

Is it possible that a local firewall or antivirus cancelled the operation? It would be surprising since the test passed at the second try.

Related discussion on Apache HTTPD mailing list:
" My guess... you have a package that installed a network service provider filter and that filter is somehow doing a close on the event handle in the overlapped structure."
http://marc.info/?l=apache-httpd-dev&m=105959505627302&w=2

---

AcceptEx() documentation:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms737524%28v=vs.85%29.aspx

test_create_server (test.test_asyncio.test_events.ProactorEventLoopTests) ...

Future/Task exception was never retrieved
future: _OverlappedFuture<exception=OSError(22, 'The I/O operation has been aborted because of either a thread exit or an application request', None, 995, None)>
Traceback (most recent call last):
  File "E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\asyncio\windows_events.py", line 428, in _poll
    value = callback(transferred, key, ov)
  File "E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\asyncio\windows_events.py", line 253, in finish_accept
    ov.getresult()
OSError: [WinError 995] The I/O operation has been aborted because of either a thread exit or an application request

http://buildbot.python.org/all/builders/x86%20Windows%20Server%202008%20%5BSB%5D%203.x/builds/2365/steps/test/logs/stdio

======================================================================
FAIL: test_create_server (test.test_asyncio.test_events.ProactorEventLoopTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:\home\cpython\buildslave\x86\3.x.snakebite-win2k8r2sp1-x86\build\lib\test\test_asyncio\test_events.py", line 642, in test_create_server
    self.assertEqual('CONNECTED', proto.state)
AssertionError: 'CONNECTED' != 'INITIAL'
- CONNECTED
+ INITIAL

---

test_create_server (test.test_asyncio.test_events.SelectEventLoopTests) ... ok
test_create_server (test.test_asyncio.test_proactor_events.BaseProactorEventLoopTests) ... FAIL
... later ...
test_create_server (test.test_asyncio.test_events.SelectEventLoopTests) ... ok
test_create_server (test.test_asyncio.test_proactor_events.BaseProactorEventLoopTests) ... ok

----------
messages: 211839
nosy: brian.curtin, gvanrossum, haypo, sbt, tim.golden, yselivanov
priority: normal
severity: normal
status: open
title: test_create_server() of test_asyncio failure on "x86 Windows Server 2008 [SB] 3.x" buildbot
versions: Python 3.4

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<http://bugs.python.org/issue20720>
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