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It turns out this test isn't deadlocking, it's just very slow on a debug build of Python. It takes 1.3 s on 3.13.0rc1, 6.31 s on a debug build of 3.13.0rc1, and 14.02 s on a debug free-threaded build. This sort of performance difference is expected I think.
Creating a dict that holds 10 million items also seems like a lot for a test. I don't have context for the original issue this test was added for, but maybe a change to use a dict with fewer items would be OK?