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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"deadlocked child process after forking on pystate.c's HEAD_LOCK","articleBody":"# Bug report\r\n\r\n### Bug description:\r\n\r\nA forked process (via os.fork) can inherit a locked runtime-\u003einterpreters.mutex from its parent process and will deadlock in this stack:\r\nChild Process (deadlocked):\r\n#0  0x0000ffffa9b2b268 in do_futex_wait.constprop () from /lib/aarch64-linux-gnu/libpthread.so.0\r\n#1  0x0000ffffa9b2b39c in __new_sem_wait_slow.constprop.0 () from /lib/aarch64-linux-gnu/libpthread.so.0\r\n#2  0x0000ffffa9e96eb8 in PyThread_acquire_lock_timed () from /usr/local/lib/libpython3.8.so.1.0\r\n#3  0x0000ffffa9e865a8 in _PyThreadState_DeleteExcept () from /usr/local/lib/libpython3.8.so.1.0\r\n#4  0x0000ffffa9eb94ac in PyOS_AfterFork_Child () from /usr/local/lib/libpython3.8.so.1.0\r\n\r\nSimilar to https://github.com/python/cpython/issues/74580 and it's solved by https://github.com/python/cpython/commit/f82c951d1c5416f3550d544e50ff5662d3836e73 on python3.6 and 3.7\r\n\r\nHowever,the problem appeares again on python3.8: HEAD_LOCK is called from PyOS_AfterFork_Child-\u003e_PyEval_ReInitThreads-\u003e_PyThreadState_DeleteExcept before PyOS_AfterFork_Child-\u003e_PyRuntimeState_ReInitThreads reinit runtime-\u003einterpreters.mutex.\r\n\r\nI notice the problem will be resolved on python3.12 from the source code,but is it still existed on python3.8 to 3.11?\r\n\r\n\r\n\r\n### CPython versions tested on:\r\n\r\n3.8\r\n\r\n### Operating systems tested on:\r\n\r\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-112336\n* gh-123687\n* gh-123688\n* gh-123713\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/ChuBoning","@type":"Person","name":"ChuBoning"},"datePublished":"2023-11-20T02:31:19.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/112275/cpython/issues/112275"}