io_uring: use io-wq manager as backup task if task is exiting
to #28170604 commit aa96bf8a9ee33457b7e3ea43e97dfa1e3a15ab20 upstream If the original task is (or has) exited, then the task work will not get queued properly. Allow for using the io-wq manager task to queue this work for execution, and ensure that the io-wq manager notices and runs this work if woken up (or exiting). Reported-by: NDan Melnic <dmm@fb.com> Signed-off-by: NJens Axboe <axboe@kernel.dk> Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com> Signed-off-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
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