Failure on AMD64 FreeBSD Shared 3.x (full log attached):

======================================================================
FAIL: test_subinterpreter (test.test__xxsubinterpreters.IsRunningTests)
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Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test__xxsubinterpreters.py", line 478, in test_subinterpreter
    self.assertTrue(interpreters.is_running(interp))
AssertionError: False is not true

...

2 tests failed:
    test__xxsubinterpreters test_interpreters

...

test_already_running (test.test_interpreters.TestInterpreterRun) ... spam
Stderr:
Exception in thread Thread-19:
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/threading.py", line 950, in _bootstrap_inner
    self.run()
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/threading.py", line 888, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_interpreters.py", line 45, in run
    interp.run(dedent(f"""
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/support/interpreters.py", line 94, in run
    _interpreters.run_string(self._id, src_str)
RuntimeError: unrecognized interpreter ID 111
FAIL

...

test test_interpreters failed
test_send_recv_same_interpreter (test.test_interpreters.TestSendRecv) ... ok
======================================================================
FAIL: test_still_running (test.test_interpreters.TestInterpreterDestroy)
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Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_interpreters.py", line 309, in test_still_running
    interp.close()
AssertionError: RuntimeError not raised
======================================================================
FAIL: test_subinterpreter (test.test_interpreters.TestInterpreterIsRunning)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_interpreters.py", line 207, in test_subinterpreter
    self.assertTrue(interp.is_running())
AssertionError: False is not true
======================================================================
FAIL: test_already_running (test.test_interpreters.TestInterpreterRun)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_interpreters.py", line 383, in test_already_running
    self.interp.run('print("spam")')
AssertionError: RuntimeError not raised
Stderr:
Exception in thread Thread-19:
Traceback (most recent call last):
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/threading.py", line 950, in _bootstrap_inner
    self.run()
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/threading.py", line 888, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_interpreters.py", line 45, in run
    interp.run(dedent(f"""
  File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/support/interpreters.py", line 94, in run
    _interpreters.run_string(self._id, src_str)
RuntimeError: unrecognized interpreter ID 111
----------------------------------------------------------------------
Ran 40 tests in 20.251s
FAILED (failures=3)
1 test failed again:
    test_interpreters
== Tests result: FAILURE then FAILURE ==

...

1 test failed:
    test_interpreters

...

2 re-run tests:
    test__xxsubinterpreters test_interpreters