René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Data race in `gc_collect_internal` on `gcstate-\u003elast_mem`","articleBody":"# Bug report\n\n### Bug description:\n\n```\nRaces assigning to __dict__ should be thread safe ... ==================\nWARNING: ThreadSanitizer: data race (pid=3951040)\n  Write of size 8 at 0x555555f78438 by thread T60:\n    #0 gc_collect_internal /home/sgross/cpython/Python/gc_free_threading.c:2248:30 (python+0x59a09e) (BuildId: 29173f71c99127c1e5ec9850aea4c8892a29468f)\n    #1 gc_collect_main /home/sgross/cpython/Python/gc_free_threading.c:2313:5 (python+0x595027) (BuildId: 29173f71c99127c1e5ec9850aea4c8892a29468f)\n    #2 _Py_RunGC /home/sgross/cpython/Python/gc_free_threading.c:2762:5 (python+0x595bd5) (BuildId: 29173f71c99127c1e5ec9850aea4c8892a29468f)\n    #3 _Py_HandlePending /home/sgross/cpython/Python/ceval_gil.c:1395:9 (python+0x5aa283) (BuildId: 29173f71c99127c1e5ec9850aea4c8892a29468f)\n\n...\n\n  Previous read of size 8 at 0x555555f78438 by thread T62:\n    #0 gc_should_collect_mem_usage /home/sgross/cpython/Python/gc_free_threading.c:2065:36 (python+0x596f36) (BuildId: 29173f71c99127c1e5ec9850aea4c8892a29468f)\n    #1 gc_should_collect /home/sgross/cpython/Python/gc_free_threading.c:2103:12 (python+0x596f36)\n    #2 record_allocation /home/sgross/cpython/Python/gc_free_threading.c:2120:13 (python+0x595b08) (BuildId: 29173f71c99127c1e5ec9850aea4c8892a29468f)\n    #3 _PyObject_GC_Link /home/sgross/cpython/Python/gc_free_threading.c:2753:5 (python+0x595b08)\n```\n\ncc @nascheme \n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\n_No response_","author":{"url":"https://github.com/colesbury","@type":"Person","name":"colesbury"},"datePublished":"2025-05-27T16:58:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/134801/cpython/issues/134801"}