yield cwd_dir
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\contextlib.py", line 131, in __exit__
    self.gen.throw(type, value, traceback)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 1098, in temp_dir
    rmtree(path)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 502, in rmtree
    _rmtree(path)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 443, in _rmtree
    _waitfor(_rmtree_inner, path, waitall=True)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 391, in _waitfor
    func(pathname)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 440, in _rmtree_inner
    _force_run(fullname, os.rmdir, fullname)
  File "C:\buildbot.python.org\3.x.kloth-win64\build\lib\test\support\__init__.py", line 386, in _force_run
    return func(*args)
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\buildbot.python.org\\3.x.kloth-win64\\build\\build\\test_python_7324\\test_python_worker_7004'

This is odd, seems transient as well so I scheduled a rebuilt:

https://buildbot.python.org/all/#/builders/81/builds/9