io-wq: ensure all pending work is canceled on exit
If we race on shutting down the io-wq, then we should ensure that any work that was queued after workers shutdown is canceled. Harden the add work check a bit too, checking for IO_WQ_BIT_EXIT and cancel if it's set. Add a WARN_ON() for having any work before we kill the io-wq context. Reported-by:<syzbot+91b4b56ead187d35c9d3@syzkaller.appspotmail.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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