test_socket.testRecvmsgPeek() timeout on "AMD64 Debian root 3.x" buildbot

[vstinner]

BPO	26206
Nosy	@vstinner, @Rosuav, @vadmium

^{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 2016-01-29.05:11:39.333>
created_at = <Date 2016-01-26.13:02:10.009>
labels = ['tests']
title = 'test_socket.testRecvmsgPeek() timeout on "AMD64 Debian root 3.x" buildbot'
updated_at = <Date 2016-01-29.05:11:39.332>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2016-01-29.05:11:39.332>
actor = 'martin.panter'
assignee = 'none'
closed = True
closed_date = <Date 2016-01-29.05:11:39.333>
closer = 'martin.panter'
components = ['Tests']
creation = <Date 2016-01-26.13:02:10.009>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 26206
keywords = ['buildbot']
message_count = 4.0
messages = ['258952', '258953', '259008', '259196']
nosy_count = 3.0
nosy_names = ['vstinner', 'Rosuav', 'martin.panter']
pr_nums = []
priority = 'normal'
resolution = 'third party'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue26206'
versions = ['Python 3.5', 'Python 3.6']

[vstinner]

The bug started between build 3071 and 3072:

• http://buildbot.python.org/all/builders/AMD64%20Debian%20root%203.x/builds/3071
• http://buildbot.python.org/all/builders/AMD64%20Debian%20root%203.x/builds/3072

Maybe it's an issue on the buildbot, not on the code directly?

http://buildbot.python.org/all/builders/AMD64%20Debian%20root%203.x/builds/3142/steps/test/logs/stdio

[300/400] test_socket
Timeout (1:00:00)!
Thread 0x00002b16599dab20 (most recent call first):
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_socket.py", line 1920 in doRecvmsg
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_socket.py", line 2376 in testRecvmsgPeek
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/case.py", line 600 in run
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/case.py", line 648 in __call__
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 122 in run
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 84 in __call__
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 122 in run
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 84 in __call__
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/runner.py", line 176 in run
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/support/init.py", line 1780 in _run_suite
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/support/init.py", line 1814 in run_unittest
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_socket.py", line 5345 in test_main
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/libregrtest/runtest.py", line 162 in runtest_inner
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/libregrtest/runtest.py", line 115 in runtest
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/libregrtest/main.py", line 295 in run_tests_sequential
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/libregrtest/main.py", line 356 in run_tests
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/libregrtest/main.py", line 392 in main
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/libregrtest/main.py", line 433 in main
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/libregrtest/main.py", line 455 in main_in_temp_cwd
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/main.py", line 3 in <module>
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/runpy.py", line 85 in _run_code
File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/runpy.py", line 184 in _run_module_as_main
make: *** [buildbottest] Error 1

[vstinner]

Info about the buildbot (regrtest headers):

== CPython 3.6.0a0 (default:fadc4b53b840, Jan 26 2016, 18:14:53) [GCC 4.7.2]
== Linux-3.2.0-4-amd64-x86_64-with-debian-7.9 little-endian
== hash algorithm: siphash24 64bit
== /root/buildarea/3.x.angelico-debian-amd64/build/build/test_python_26835

Info about the failing test:

@requireAttrs(socket, "MSG_PEEK")
def testRecvmsgPeek(self):
    # Check that MSG_PEEK in flags enables examination of pending
    # data without consuming it.

The unit test is old, it was introduced in 2011:

changeset: 72029:c64216addd7f
parent: 72027:1702749b1060
user: Nick Coghlan <ncoghlan@gmail.com>
date: Mon Aug 22 11:55:57 2011 +1000
files: Doc/library/socket.rst Doc/whatsnew/3.3.rst Lib/ssl.py Lib/test/test_socket.py Lib/test/test_ssl.py Misc/NEWS Modules/socketmodule.c
description:
Add support for the send/recvmsg API to the socket module. Patch by David Watson and Heiko Wundram. (Closes bpo-6560)

[vadmium]

A few more details from <https://mail.python.org/pipermail/python-dev/2016-January/142885.html\>:

• Affects Python 3 but not 2.7.
• Offending test case: RecvmsgUDP6Test.testRecvmsgPeek()
• Seems to correspond with the buildbot VM’s config recently being rebuilt

[vadmium]

The problem has apparently been fixed at the buildbot end