test_notify_all() of test_multiprocessing_forkserver failed on Python on x86 Tiger 3.6 with "ValueError: cannot convert float NaN to integer":

http://buildbot.python.org/all/#/builders/46/builds/60

0:52:21 load avg: 1.46 [378/406/1] test_multiprocessing_forkserver crashed (Exit code 1)

Traceback (most recent call last):
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/forkserver.py", line 196, in main
    _serve_one(s, listener, alive_r, old_handlers)
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/forkserver.py", line 231, in _serve_one
    code = spawn._main(child_r)
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/spawn.py", line 114, in _main
    prepare(preparation_data)
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/spawn.py", line 223, in prepare
    _fixup_main_from_name(data['init_main_from_name'])
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/spawn.py", line 249, in _fixup_main_from_name
    alter_sys=True)
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/runpy.py", line 201, in run_module
    mod_name, mod_spec, code = _get_module_details(mod_name)
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/runpy.py", line 153, in _get_module_details
    code = loader.get_code(mod_name)
  File "<frozen importlib._bootstrap_external>", line 762, in get_code
ValueError: cannot convert float NaN to integer

Timeout (0:25:00)!
Thread 0xa000d000 (most recent call first):
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/connection.py", line 379 in _recv
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/connection.py", line 407 in _recv_bytes
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/connection.py", line 250 in recv
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/managers.py", line 757 in _callmethod
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/multiprocessing/managers.py", line 987 in acquire
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/_test_multiprocessing.py", line 1044 in test_notify_all
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/unittest/case.py", line 605 in run
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/unittest/case.py", line 653 in __call__
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/unittest/suite.py", line 122 in run
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/unittest/suite.py", line 84 in __call__
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/unittest/suite.py", line 122 in run
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/unittest/suite.py", line 84 in __call__
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/unittest/suite.py", line 122 in run
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/unittest/suite.py", line 84 in __call__
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/unittest/runner.py", line 176 in run
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/support/__init__.py", line 1888 in _run_suite
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/support/__init__.py", line 1932 in run_unittest
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/libregrtest/runtest.py", line 172 in test_runner
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/libregrtest/runtest.py", line 173 in runtest_inner
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/libregrtest/runtest.py", line 127 in runtest
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/libregrtest/runtest_mp.py", line 71 in run_tests_slave
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/libregrtest/main.py", line 516 in _main
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/libregrtest/main.py", line 509 in main
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/libregrtest/main.py", line 584 in main
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/regrtest.py", line 46 in _main
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/regrtest.py", line 50 in <module>
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/runpy.py", line 85 in _run_code
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/runpy.py", line 193 in _run_module_as_main


Moreover, when test_multiprocessing_forkserver was run a second time, a different test failed, test_forkserver_sigkill():


Re-running test 'test_multiprocessing_forkserver' in verbose mode
(...)
test_forkserver_sigint (test.test_multiprocessing_forkserver.WithProcessesTestProcess) ... ok
test_forkserver_sigkill (test.test_multiprocessing_forkserver.WithProcessesTestProcess) ... FAIL
test_lose_target_ref (test.test_multiprocessing_forkserver.WithProcessesTestProcess) ... ok
(...)
======================================================================
FAIL: test_forkserver_sigkill (test.test_multiprocessing_forkserver.WithProcessesTestProcess)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/_test_multiprocessing.py", line 496, in test_forkserver_sigkill
    self.check_forkserver_death(signal.SIGKILL)
  File "/Users/db3l/buildarea/3.6.bolen-tiger/build/Lib/test/_test_multiprocessing.py", line 486, in check_forkserver_death
    self.assertTrue(evt.is_set())
AssertionError: False is not true