x86-64 macOS 3.x:
https://buildbot.python.org/all/#/builders/366/builds/969

Build triggered by the commit 88d9983b561cd59e5f186d98227de0c1a022b498 which changes PyImport_Import().


The buildbot is running on macOS 10.15.7 (Darwin Kernel Version 19.6.0) with a limit of 256 file descriptors.


The latest successful build is build 968, whereas the the RLIMIT_NOFILE resource soft limit was also set to 256:
https://buildbot.python.org/all/#/builders/366/builds/968


test.pythoninfo:

* os.uname: posix.uname_result(sysname='Darwin', nodename='mattb-mbp2', release='19.6.0', version='Darwin Kernel Version 19.6.0: Tue Jan 12 22:13:05 PST 2021; root:xnu-6153.141.16~1/RELEASE_X86_64', machine='x86_64')
* sysconfig[HOST_GNU_TYPE]: x86_64-apple-darwin19.6.0
* platform.platform: macOS-10.15.7-x86_64-i386-64bit
* resource.RLIMIT_NOFILE: (256, 9223372036854775807)


FAIL: test_multiprocessing_pool_circular_import (test.test_importlib.test_threaded_import.ThreadedImportTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/test/test_importlib/test_threaded_import.py", line 258, in test_multiprocessing_pool_circular_import
    script_helper.assert_python_ok(fn)
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/test/support/script_helper.py", line 160, in assert_python_ok
    return _assert_python(True, *args, **env_vars)
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/test/support/script_helper.py", line 145, in _assert_python
    res.fail(cmd_line)
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/test/support/script_helper.py", line 72, in fail
    raise AssertionError("Process return code is %d\n"
AssertionError: Process return code is 1
command line: ['/Users/buildbot/buildarea/3.x.billenstein-macos/build/python.exe', '-X', 'faulthandler', '-I', '/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/test/test_importlib/partial/pool_in_threads.py']

stdout:
---

---

stderr:
---
Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/test/test_importlib/partial/pool_in_threads.py", line 9, in t
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/context.py", line 119, in Pool
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/pool.py", line 196, in __init__
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/context.py", line 113, in SimpleQueue
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/queues.py", line 341, in __init__
    self._reader, self._writer = connection.Pipe(duplex=False)
  File "/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/connection.py", line 532, in Pipe
    fd1, fd2 = os.pipe()
OSError: [Errno 24] Too many open files
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:224: UserWarning: resource_tracker: There appear to be 110 leaked semaphore objects to clean up at shutdown
  warnings.warn('resource_tracker: There appear to be %d '
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-56i6i4ap': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-0au5otkl': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-vcv0xwbi': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-vxfb4ks9': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-5e2_0z1f': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-6vsgax4k': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-mq51g4b_': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-eik0n2aq': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-g7oeb4aw': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-tiabsvgr': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-ykag01b2': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
/Users/buildbot/buildarea/3.x.billenstein-macos/build/Lib/multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-nl2kdidn': [Errno 2] No such file or directory
  warnings.warn('resource_tracker: %r: %s' % (name, e))
---