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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Data races in typeobject.c for type structure updates","articleBody":"# Bug report\n\n### Bug description:\n\nThere are some additional data races (producing TSAN warnings) for typeobject.c in the free-threaded build.\n\nThe following stores are unsafe:\n\n- [x] _Py_slot_tp_getattr_hook re-assigns tp_getattro\n- [x] slot_tp_descr_get assigns to tp_descr_get\n- [x] type_set_name assigns to tp_name\n- [x] tp_base and tp_bases are assigned in likely unsafe ways\n\n\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-133534\n* gh-133717\n* gh-137302\n* gh-137303\n* gh-140549\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/nascheme","@type":"Person","name":"nascheme"},"datePublished":"2025-05-05T19:42:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/133467/cpython/issues/133467"}