URL: http://github.com/python/cpython/pull/101556.diff
on to create # a file in /dev/shm/ directory. - synchronize.Lock(ctx=None) + import multiprocessing + synchronize.Lock(ctx=multiprocessing.get_context('fork')) + # The explicit fork mp context is required in order for + # TestResourceTracker.test_resource_tracker_reused to work. + # synchronize creates a new multiprocessing.resource_tracker + # process at module import time via the above call in that + # scenario. Awkward. This enables gh-84559. No code involved + # should have threads at that point so fork() should be safe. + except OSError as exc: raise unittest.SkipTest(f"broken multiprocessing SemLock: {exc!r}") diff --git a/Misc/NEWS.d/next/Library/2024-09-19-00-09-48.gh-issue-84559.IrxvQe.rst b/Misc/NEWS.d/next/Library/2024-09-19-00-09-48.gh-issue-84559.IrxvQe.rst new file mode 100644 index 00000000000000..a4428e20f3ccdd --- /dev/null +++ b/Misc/NEWS.d/next/Library/2024-09-19-00-09-48.gh-issue-84559.IrxvQe.rst @@ -0,0 +1,5 @@ +The default :mod:`multiprocessing` start method on Linux and other POSIX +systems has been changed away from often unsafe ``"fork"`` to ``"forkserver"`` +(when the platform supports sending file handles over pipes as most do) or +``"spawn"``. Mac and Windows are unchanged as they already default to +``"spawn"``.Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.
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