After PR11772, some buildbots with refleak checks fail because the tests modify the environment (leaking processes or threads or files ...). Some of the failures: https://buildbot.python.org/all/#builders/80/builds/506 ttps://buildbot.python.org/all/#builders/114/builds/375 https://buildbot.python.org/all/#builders/1/builds/497 == Tests result: ENV CHANGED == 409 tests OK. 10 slowest tests: - test_multiprocessing_spawn: 32 min 19 sec - test_concurrent_futures: 25 min 37 sec - test_asyncio: 24 min 56 sec - test_multiprocessing_forkserver: 13 min 57 sec - test_multiprocessing_fork: 11 min 2 sec - test_zipfile: 10 min 2 sec - test_decimal: 8 min 30 sec - test_gdb: 8 min 301 ms - test_lib2to3: 7 min 46 sec - test_buffer: 7 min 43 sec 3 tests altered the execution environment: test_multiprocessing_fork test_multiprocessing_forkserver test_multiprocessing_spawn 8 tests skipped: test_devpoll test_kqueue test_msilib test_startfile test_winconsoleio test_winreg test_winsound test_zipfile64
