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charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "},"content":"SRU Justification:\n\n[Impact]\n\nio_uring: check if we need to reschedule during overflow flush\n\nIn terms of normal application usage, this list will always be empty.\nAnd if an application does overflow a bit, it'll have a few entries.\nHowever, nothing obviously prevents syzbot from running a test case\nthat generates a ton of overflow entries, and then flushing them can\ntake quite a while.\n\nCheck for needing to reschedule while flushing, and drop our locks and\ndo so if necessary. There's no state to maintain here as overflows\nalways prune from head-of-list, hence it's fine to drop and reacquire\nthe locks at the end of the loop.\n\n[Fix]\n\nQuesting: not affected\nNoble: fixed separately\nJammy: backported from upstream\nFocal: not affected\nBionic: not affected\nXenial: not affected\nTrusty: not affected\n\n[Test Plan]\n\nCompile and boot tested.\n\n[Where problems could occur]\n\nThe change affects io_uring in the overflow list processing\ncode. Issues might affect slow consumer processes that cause\nthe overflow path to be taken.\n\nJens Axboe (1):\n io_uring: check if we need to reschedule during overflow flush\n\n io_uring/io_uring.c | 17 +++++++++++++++++\n 1 file changed, 17 insertions(+)"}