René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Possible race condition in signal handling","articleBody":"The following code segfaults the interpreter on Linux.  Tested on current main. \r\n\r\n```py\r\nimport gc\r\nimport _thread\r\n\r\ngc.set_threshold(1, 0, 0)\r\n\r\ndef cb(*args):\r\n    _thread.interrupt_main()\r\n\r\n\r\ngc.callbacks.append(cb)\r\n\r\ndef gen():\r\n    yield 1\r\n\r\ng = gen()\r\ng.__next__()\r\n```\r\n\r\n```console \r\nException ignored in: \u003cfunction cb at 0x7f7f4f6fe200\u003e\r\nTraceback (most recent call last):\r\n  File \"/workspaces/cpython/main.py\", line 7, in cb\r\n    _thread.interrupt_main()\r\nKeyboardInterrupt: \r\nException ignored in: \u003cfunction cb at 0x7f7f4f6fe200\u003e\r\nTraceback (most recent call last):\r\n  File \"/workspaces/cpython/main.py\", line 7, in cb\r\n    _thread.interrupt_main()\r\nKeyboardInterrupt: \r\nException ignored in: \u003cfunction cb at 0x7f7f4f6fe200\u003e\r\nTraceback (most recent call last):\r\n  File \"/workspaces/cpython/main.py\", line 7, in cb\r\n    _thread.interrupt_main()\r\nKeyboardInterrupt: \r\nException ignored in: \u003cfunction cb at 0x7f7f4f6fe200\u003e\r\nTraceback (most recent call last):\r\n  File \"/workspaces/cpython/main.py\", line 7, in cb\r\n    _thread.interrupt_main()\r\nKeyboardInterrupt: \r\nSegmentation fault (core dumped)\r\n```\r\n\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-102399\n* gh-102527\n* gh-102528\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/kumaraditya303","@type":"Person","name":"kumaraditya303"},"datePublished":"2023-03-03T13:33:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/102397/cpython/issues/102397"}