I found 2 problems with __io_sequence_defer(). 1. it uses @sq_dropped, but doesn't consider @cq_overflow 2. @sq_dropped and @cq_overflow are write-shared with userspace, so it can be maliciously changed. see sent liburing test (test/defer *_hung()), which left an unkillable process for me -- Yours sincerely, Pavel Begunkov
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