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io_uring: prevent racy sqd->thread checks
SQPOLL thread to which we're trying to attach may be going away, it's not nice but a more serious problem is if io_sq_offload_create() sees sqd->thread==NULL, and tries to init it with a new thread. There are tons of ways it can be exploited or fail. Signed-off-by: Pavel Begunkov <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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