test_eintr.test_os_open hangs under Xcode 7

[brettcannon]

BPO	25234
Nosy	@brettcannon, @ronaldoussoren, @vstinner, @ned-deily, @vadmium
PRs	bpo-35208: Fix IDLE Squeezer line counting #10449 bpo-35208: Fix IDLE Squeezer line counting #10449

^{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 = 'https://github.com/brettcannon'
closed_at = <Date 2016-01-22.23:56:16.166>
created_at = <Date 2015-09-25.19:41:19.347>
labels = ['OS-mac', 'type-bug']
title = 'test_eintr.test_os_open hangs under Xcode 7'
updated_at = <Date 2019-05-21.21:24:57.813>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2019-05-21.21:24:57.813>
actor = 'ned.deily'
assignee = 'brett.cannon'
closed = True
closed_date = <Date 2016-01-22.23:56:16.166>
closer = 'brett.cannon'
components = ['macOS']
creation = <Date 2015-09-25.19:41:19.347>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 25234
keywords = []
message_count = 14.0
messages = ['251597', '251647', '251650', '253084', '253099', '253101', '256280', '256315', '256337', '257155', '258351', '258399', '258848', '259150']
nosy_count = 6.0
nosy_names = ['brett.cannon', 'ronaldoussoren', 'vstinner', 'ned.deily', 'python-dev', 'martin.panter']
pr_nums = ['10449', '10449']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25234'
versions = ['Python 3.5', 'Python 3.6']

[brettcannon]

Specifically:
Apple LLVM version 7.0.0 (clang-700.0.72)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

I'm assuming this is a Mac issue since none of the buildbots are having a similar issue.

[ned-deily]

Brett, was this on OS X 10.10.x or a 10.11 pre-release? test_eintr does not fail fail for me on either using the most recent Xcode 7.

[brettcannon]

It is 10.10, but apparently a reboot fixed it (software, am I right? =/ ).

[brettcannon]

This is still an intermittent problem for me. Maybe it's related to issue bpo-25122 ?

[vstinner]

Hi Brett, if you are motivated, you can try the C program that I wrote to reproduce the bug on FreeBSD. It's attached to bpo-25122. If the C program hangs too, it would mean that Darwin has also a bug (same bug??) in its code to handle signals in the code handling FIFO devices.

Or you can just add a skip mentioning this issue.

On my FreeBSD VM, it took a few minutes and multiples instances of the C program to reproduce the bug. On physical machines, other reported that a seconds and a single instance is enough. Well, see the FreeBSD bug report for more information ;-)

[brettcannon]

I can't get your testing program to compile, Victor, so if I run into it again I will add a skip to the test (harder to detect that it's the same test since test_eintr runs another test suite as if it's a single test).

[vadmium]

The Yosemite ICC 3.5 buildbot seems to be intermittently hanging test_os_open() and test_open(). Currently it shows five builds. Build 396 hung at test_os_open(); build 400 hung at test_open(), and the other three passed.

http://buildbot.python.org/all/builders/x86-64%20Yosemite%20ICC%20Debug%203.5

Slave information
Buildbot-Slave 0.8.12
OSX 10.10.3 (Yosemite) Mac Mini VMWare VM 2x2.86 GHz 8GB

[brettcannon]

I'm still getting the occasional hang for this so I'm going to skip the test under OS X.

[vstinner]

I'm still getting the occasional hang for this so I'm going to skip the test under OS X.

Go ahead. I'm not interested to analyze bugs of closed source kernels.

[python-dev]

New changeset 7fc1296d1acf by Brett Cannon in branch 'default':
Issue bpo-25234: Skip test_eintr.test_os_open under OS X.
https://hg.python.org/cpython/rev/7fc1296d1acf

[vadmium]

Brett, do you think you should also skip test_open()? The same buildbot recently failed again in that method.

[brettcannon]

Sure, that test can be skipped as well if it is hanging.

[python-dev]

New changeset 9d65a195246b by Brett Cannon in branch 'default':
Issue bpo-25234: Skip test_eintr.test_open() under OS X to avoid hanging
https://hg.python.org/cpython/rev/9d65a195246b

[python-dev]

New changeset ddce15b21c21 by Victor Stinner in branch '3.5':
Backport fixes on test_eintr
https://hg.python.org/cpython/rev/ddce15b21c21