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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Heap types implemented in C must have Py_TPFLAGS_HAVE_GC and implement tp_traverse","articleBody":"If a heap type does not have Py_TPFLAGS_HAVE_GC or doesn't not implement tp_traverse, the garbage collector may fail to collect the type *and* most of its instances at Python exit. The problem is worse when sub-interpreters are involved: if a sub-interpreter exits and does not clear all of its memory, the other interpreters will continue running with these leaks.\n\nSee issue gh-87138 for the rationale.\n\nI wrote an article on the lock type which had this bug and caused a memory leak: https://vstinner.github.io/subinterpreter-leaks.html\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-116947\n* gh-138290\n* gh-138327\n* gh-138328\n* gh-138331\n* gh-138333\n* gh-138427\n* gh-138428\n* gh-138334\n* gh-138340\n* gh-138341\n* gh-138582\n* gh-138807\n* gh-139073\n* gh-139474\n* gh-141268\n* gh-141448\n\u003c!-- /gh-linked-prs --\u003e\n\nThe following PRs were directly closed because the types are immutable and empty:\n\n* gh-138329\n* gh-138330\n* gh-138332\n\nThe following PRs were wrongly merged so we reverted them:\n\n* gh-138266\n* gh-138320\n* gh-138322\n* gh-138288\n* gh-138321\n* gh-138323\n* gh-138289\n* gh-138324\n* gh-138326\n\nPRs for reverting the above commits:\n \n* gh-138338\n* gh-138337\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2024-03-18T07:56:56.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":24},"url":"https://github.com/116946/cpython/issues/116946"}