test_socket failures on Debian unstable

[pitrou]

BPO	10104
Nosy	@doko42, @pitrou, @lekma

^{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 2011-01-04.00:55:22.500>
created_at = <Date 2010-10-14.16:09:32.250>
labels = ['type-bug', 'tests']
title = 'test_socket failures on Debian unstable'
updated_at = <Date 2011-01-04.00:55:22.499>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2011-01-04.00:55:22.499>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2011-01-04.00:55:22.500>
closer = 'pitrou'
components = ['Tests']
creation = <Date 2010-10-14.16:09:32.250>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 10104
keywords = ['buildbot']
message_count = 6.0
messages = ['118677', '118680', '118684', '118686', '118687', '125267']
nosy_count = 4.0
nosy_names = ['doko', 'pitrou', 'lekma', 'nvetoshkin']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue10104'
versions = ['Python 3.2']

[pitrou]

This is following r85480 (issue bpo-7523). It seems the Debian unstable system on one of the buildbots has SOCK_NONBLOCK and SOCK_CLOEXEC, but doesn't support creating sockets using these flags:

======================================================================
ERROR: testInitNonBlocking (test.test_socket.NonBlockingTCPTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/doko/buildarea/3.x.klose-debian-alpha/build/Lib/test/test_socket.py", line 914, in testInitNonBlocking
    socket.SOCK_NONBLOCK)
  File "/home/doko/buildarea/3.x.klose-debian-alpha/build/Lib/socket.py", line 94, in __init__
    _socket.socket.__init__(self, family, type, proto, fileno)
socket.error: [Errno 22] Invalid argument

======================================================================
ERROR: test_SOCK_CLOEXEC (test.test_socket.CloexecConstantTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/doko/buildarea/3.x.klose-debian-alpha/build/Lib/test/test_socket.py", line 1834, in test_SOCK_CLOEXEC
    socket.SOCK_STREAM | socket.SOCK_CLOEXEC)
  File "/home/doko/buildarea/3.x.klose-debian-alpha/build/Lib/socket.py", line 94, in __init__
    _socket.socket.__init__(self, family, type, proto, fileno)
socket.error: [Errno 22] Invalid argument

======================================================================
ERROR: test_SOCK_NONBLOCK (test.test_socket.NonblockConstantTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/home/doko/buildarea/3.x.klose-debian-alpha/build/Lib/test/test_socket.py", line 1854, in test_SOCK_NONBLOCK
    socket.SOCK_STREAM | socket.SOCK_NONBLOCK)
  File "/home/doko/buildarea/3.x.klose-debian-alpha/build/Lib/socket.py", line 94, in __init__
    _socket.socket.__init__(self, family, type, proto, fileno)
socket.error: [Errno 22] Invalid argument

(full log at http://www.python.org/dev/buildbot/3.x/builders/alpha%20Debian%203.x/builds/258/steps/test/logs/stdio)

[nvetoshkin]

What about kernel version? As far as I know 2.6.27 is minimum requirement.

[nvetoshkin]

Here's the patch from debian's issue http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=529920
Patch URL: https://patches.ubuntu.com/by-release/extracted/ubuntu/n/neon27/0.28.4-2/01_runtime_detect_sock_cloexec.dpatch

[pitrou]

Thanks for the research. Given that it only happens on Debian unstable, and it only happens if you explicitly use SOCK_{CLOEXEC,NONBLOCK}, I would vote for not adding a workaround until some supported OS also exhibits the issue.

[nvetoshkin]

Agree.
Already written code won't suffer, new code should be ready to use new linux kernel.

[pitrou]

Fixed some time ago.