Consistent test_utime() failures on FreeBSD

[koobs]

BPO	24175
Nosy	@zware, @koobs
Superseder	bpo-15745: Numerous utime ns tests fail on FreeBSD w/ ZFS (update: and NetBSD w/ FFS, Solaris w/ UFS)

^{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 2015-06-13.04:14:23.469>
created_at = <Date 2015-05-13.12:45:00.879>
labels = ['type-bug', 'tests']
title = 'Consistent test_utime() failures on FreeBSD'
updated_at = <Date 2015-06-13.04:14:23.468>
user = 'https://github.com/koobs'

bugs.python.org fields:

activity = <Date 2015-06-13.04:14:23.468>
actor = 'zach.ware'
assignee = 'none'
closed = True
closed_date = <Date 2015-06-13.04:14:23.469>
closer = 'zach.ware'
components = ['Tests']
creation = <Date 2015-05-13.12:45:00.879>
creator = 'koobs'
dependencies = []
files = []
hgrepos = []
issue_num = 24175
keywords = ['3.4regression']
message_count = 5.0
messages = ['243083', '243084', '244255', '245155', '245289']
nosy_count = 2.0
nosy_names = ['zach.ware', 'koobs']
pr_nums = []
priority = 'high'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = '15745'
type = 'behavior'
url = 'https://bugs.python.org/issue24175'
versions = ['Python 3.4', 'Python 3.5', 'Python 3.6']

[koobs]

The following test failure is observable in koobs-freebsd9 and koobs-freebsd10 buildbots, on the 3.4 and 3.x branches.

======================================================================
FAIL: test_utime (test.test_os.StatAttributeTests)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/test_os.py", line 418, in test_utime
    self._test_utime(self.fname, getattr, utime, 10)
  File "/usr/home/buildbot/python/3.x.koobs-freebsd9/build/Lib/test/test_os.py", line 405, in _test_utime
    self.assertEqual(attr(st0, "st_mtime"), attr(st1, "st_mtime"))
AssertionError: 1431519042.77718 != 1431519042.777179

The regression was introduced recently, with the last successful build on koobs-freebsd10 being:

3.4: revision 69951573cb0ecd264d14648b6854c2dce3974186
3.x: revision c031fa8e6884808667e4e5b800c4f2184d46279c

[koobs]

After running the latest builds, it appears 3.x is now green, leaving 3.4 failing

[koobs]

See also:

bpo-16287 (Solaris)
bpo-15745 (Related to FreeBSD/ZFS, has patch)

3.4 and 3.x are still failing

[koobs]

test_utime is now consistently failing on 3.4, 3.5 and default

[zware]

This appears to have been fixed in bpo-15745.