[issue36273] test_thread leaks a core dump on PPC64 AIX 3.x

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Same test_threading crash on POWER6 AIX 3.x:
https://buildbot.python.org/all/#/builders/161/builds/1430

This build was triggered by the change of bpo-18049 which is supposed to only impact macOS, but it does touch test_recursion_limit... can it be related to the regression?

https://github.com/python/cpython/commit/1a057bab0f18d6ad843ce321d1d77a4819497ae4

test_recursion_limit (test.test_threading.ThreadingExceptionTests) ... FAIL
test_releasing_unacquired_lock (test.test_threading.ThreadingExceptionTests) ... ok
test_start_thread_again (test.test_threading.ThreadingExceptionTests) ... ok
test_init_immutable_default_args (test.test_threading.TimerTests) ... ok

======================================================================
FAIL: test_recursion_limit (test.test_threading.ThreadingExceptionTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/test/test_threading.py", line 1088, in test_recursion_limit
    self.assertEqual(p.returncode, 0, "Unexpected error: " + stderr.decode())
AssertionError: -11 != 0 : Unexpected error: 

----------------------------------------------------------------------

Ran 168 tests in 12.623s

FAILED (failures=1)
Warning -- files was modified by test_threading
  Before: []
  After:  ['core']

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<https://bugs.python.org/issue36273>
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