Test failures under macOS 10.12 Sierra

[rhettinger]

BPO	28456
Nosy	@rhettinger, @ronaldoussoren, @vstinner, @ned-deily, @ambv
Superseder	bpo-28087: macOS 12 poll syscall returns prematurely

^{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 2016-10-16.23:24:11.474>
created_at = <Date 2016-10-16.21:59:06.305>
labels = ['interpreter-core']
title = 'Test failures under macOS 10.12 Sierra'
updated_at = <Date 2016-10-16.23:25:40.246>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2016-10-16.23:25:40.246>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2016-10-16.23:24:11.474>
closer = 'ned.deily'
components = ['Interpreter Core']
creation = <Date 2016-10-16.21:59:06.305>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 28456
keywords = []
message_count = 4.0
messages = ['278780', '278781', '278782', '278787']
nosy_count = 5.0
nosy_names = ['rhettinger', 'ronaldoussoren', 'vstinner', 'ned.deily', 'lukasz.langa']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '28087'
type = None
url = 'https://bugs.python.org/issue28456'
versions = ['Python 3.6']

[rhettinger]

On a fresh checkout, I'm getting two test failures:

$ ./configure && make
$ ./python.exe -m test.regrtest -v test_asyncore
     [snip]

======================================================================
FAIL: test_handle_expt (test.test_asyncore.TestAPI_UseIPv4Poll)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/raymond/cleancpython/Lib/test/test_asyncore.py", line 674, in test_handle_expt
    self.loop_waiting_for_flag(client)
  File "/Users/raymond/cleancpython/Lib/test/test_asyncore.py", line 514, in loop_waiting_for_flag
    self.fail("flag not set")
AssertionError: flag not set

======================================================================
FAIL: test_handle_expt (test.test_asyncore.TestAPI_UseIPv6Poll)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/raymond/cleancpython/Lib/test/test_asyncore.py", line 674, in test_handle_expt
    self.loop_waiting_for_flag(client)
  File "/Users/raymond/cleancpython/Lib/test/test_asyncore.py", line 514, in loop_waiting_for_flag
    self.fail("flag not set")
AssertionError: flag not set

---

Ran 101 tests in 20.506s

FAILED (failures=2, skipped=6)
test test_asyncore failed
test_asyncore failed

1 test failed:
test_asyncore

$ ./python.exe -m test.regrtest -v test_eintr
  [snip]

======================================================================
FAIL: test_poll (main.SelectEINTRTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/raymond/cleancpython/Lib/test/eintrdata/eintr_tester.py", line 446, in test_poll
    self.assertGreaterEqual(dt, self.sleep_time)
AssertionError: 9.176997991744429e-06 not greater than or equal to 0.2

---

Ran 22 tests in 5.288s

FAILED (failures=1, skipped=5)
---

stderr:
---

Traceback (most recent call last):
  File "/Users/raymond/cleancpython/Lib/test/eintrdata/eintr_tester.py", line 492, in <module>
    test_main()
  File "/Users/raymond/cleancpython/Lib/test/eintrdata/eintr_tester.py", line 488, in test_main
    SelectEINTRTest)
  File "/Users/raymond/cleancpython/Lib/test/support/__init__.py", line 1849, in run_unittest
    _run_suite(suite)
  File "/Users/raymond/cleancpython/Lib/test/support/__init__.py", line 1824, in _run_suite
    raise TestFailed(err)
test.support.TestFailed: Traceback (most recent call last):
  File "/Users/raymond/cleancpython/Lib/test/eintrdata/eintr_tester.py", line 446, in test_poll
    self.assertGreaterEqual(dt, self.sleep_time)
AssertionError: 9.176997991744429e-06 not greater than or equal to 0.2
---

---

Ran 1 test in 5.424s

FAILED (failures=1)
test test_eintr failed
test_eintr failed

1 test failed:
test_eintr

Total duration: 5 sec
Tests result: FAILURE

[vstinner]

See https://daniel.haxx.se/blog/2016/10/11/poll-on-mac-10-12-is-broken/

C function poll() seems to be broken on Sierra.

[vstinner]

Try to modify pyconfig.h to define HAVE_BROKEN_POLL. It should work around the bug.

configure.ac contains a test for HAVE_BROKEN_POLL. We need another test for poll() being broken differently.

Note: asyncio doesn't seem to be affect because it probably uses the more efficient kqueue by default on OS X.

[ned-deily]

This is a duplicate of bpo-28087.