From: Olivier Langlois olivier@trillion01.com
commit 997135017716c33f3405e86cca5da9567b40a08e upstream.
If an asynchronous completion happens before the task is preparing itself to wait and set its state to TASK_INTERRUPTIBLE, the completion will not wake up the sqp thread.
Cc: stable@vger.kernel.org Signed-off-by: Olivier Langlois olivier@trillion01.com Reviewed-by: Pavel Begunkov asml.silence@gmail.com Link: https://lore.kernel.org/r/d1419dc32ec6a97b453bee34dc03fa6a02797142.162447320... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/io_uring.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -6876,7 +6876,8 @@ static int io_sq_thread(void *data) }
prepare_to_wait(&sqd->wait, &wait, TASK_INTERRUPTIBLE); - if (!test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state)) { + if (!test_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state) && + !io_run_task_work()) { list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) io_ring_set_wakeup_flag(ctx);