gh-149816: #96 Fix a race condition in invoke_gc_callback with free threading#150029
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dzaramelcone wants to merge 1 commit into
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gh-149816: #96 Fix a race condition in invoke_gc_callback with free threading#150029dzaramelcone wants to merge 1 commit into
dzaramelcone wants to merge 1 commit into
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The optimization that avoided allocating an info dict when no gc callbacks were registered introduces a time of check to time of use race in free threaded mode (lineno 1943-1955). I just pulled out the check. Since info is always non-null, I also replaced XDECREF use with DECREF. (lineno 1959, lineno 1982).
I implemented a stress test for this and uncovered what I believe to be a bug with
_PyList_GetItemRef. I am following suit with python/cpython#149909 and not including the test with my PR for two reasons:_PyList_GetItemRef(but I'm happy to open an issue for it!)also, this is my first PR against CPython, I am doing it from PyCon US as part of the sprint! :) Hello world!