test_thread crashed with SIGBUS on AMD64 FreeBSD 10.x Shared 3.6

[vstinner]

BPO	30369
Nosy	@vstinner

^{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 2017-08-11.00:07:42.703>
created_at = <Date 2017-05-15.09:54:15.310>
labels = ['tests', 'type-crash']
title = 'test_thread crashed with SIGBUS on AMD64 FreeBSD 10.x Shared 3.6'
updated_at = <Date 2017-08-11.00:07:42.702>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2017-08-11.00:07:42.702>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2017-08-11.00:07:42.703>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2017-05-15.09:54:15.310>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 30369
keywords = []
message_count = 2.0
messages = ['293701', '300144']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue30369'
versions = ['Python 3.6']

[vstinner]

SIGBUS on the second gc.collect() call of support.gc_collect() in test_thread.

http://buildbot.python.org/all/builders/AMD64%20FreeBSD%2010.x%20Shared%203.6/builds/136/steps/test/logs/stdio

0:07:35 [330/405] test_thread crashed -- running: test_datetime (106 sec)
Fatal Python error: Bus error

Current thread 0x0000000802372800 (most recent call first):

Thread 0x0000000802006400 (most recent call first):
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/support/__init__.py", line 1511 in gc_collect
    gc.collect()
    if is_jython:
        time.sleep(0.1)
    gc.collect() <~~~~ HERE
    gc.collect()
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/save_env.py", line 271 in __exit__
        support.gc_collect()  # Some resources use weak references
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/runtest.py", line 168 in runtest_inner
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/runtest.py", line 119 in runtest
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/runtest_mp.py", line 71 in run_tests_slave
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/main.py", line 475 in _main
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/main.py", line 468 in main
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/main.py", line 532 in main
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/regrtest.py", line 46 in _main
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/regrtest.py", line 50 in <module>
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/runpy.py", line 85 in _run_code
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/runpy.py", line 193 in _run_module_as_main
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/__main__.py", line 2, in <module>
    main()
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/main.py", line 532, in main
    Regrtest().main(tests=tests, **kwargs)
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/main.py", line 468, in main
    self._main(tests, kwargs)
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/main.py", line 490, in _main
    self.run_tests()
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/main.py", line 416, in run_tests
    run_tests_multiprocess(self)
  File "/usr/home/buildbot/python/3.6.koobs-freebsd10/build/Lib/test/libregrtest/runtest_mp.py", line 221, in run_tests_multiprocess
    raise Exception(msg)
Exception: Child error on test_thread: Exit code -10
*** Error code 1

[vstinner]

I only saw this bug once, so I close the issue.