René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Need to defer GC tracking of frozenset/set construction","articleBody":"[The same bug](https://github.com/python/cpython/issues/151722) affects frozenset/set: construction GC-tracks the object before it's filled, so another thread can reach a half-built frozenset via gc.get_objects() mid-construction. ThreadSanitizer confirms it:\n\n```\nWARNING: ThreadSanitizer: data race (pid=78348)\nSUMMARY: ThreadSanitizer: data race setobject.c:320 in set_add_entry_takeref\nWARNING: ThreadSanitizer: data race (pid=78348)\nSUMMARY: ThreadSanitizer: data race setobject.c:321 in set_add_entry_takeref\nWARNING: ThreadSanitizer: data race (pid=78348)\nSUMMARY: ThreadSanitizer: data race setobject.c:323 in set_add_entry_takeref\nWARNING: ThreadSanitizer: data race (pid=78348)\nSUMMARY: ThreadSanitizer: data race setobject.c:537 in set_table_resize\nSUMMARY: ThreadSanitizer: SEGV setobject.c:816 in set_repr\n```\n\nI am working on this\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-152237\n* gh-152242\n* gh-152243\n* gh-152272\n* gh-152273\n* gh-152278\n* gh-152279\n* gh-152280\n* gh-152290\n* gh-152312\n* gh-152316\n* gh-152319\n* gh-153079\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/corona10","@type":"Person","name":"corona10"},"datePublished":"2026-06-25T20:22:47.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/152235/cpython/issues/152235"}