Re: [PATCH 1/4] io_uring: fix hanging iopoll in case of -EAGAIN

[Jens Axboe]

On 6/22/20 4:16 PM, Pavel Begunkov wrote:
> io_do_iopoll() won't do anything with a request unless
> req->iopoll_completed is set. So io_complete_rw_iopoll() has to set
> it, otherwise io_do_iopoll() will poll a file again and again even
> though the request of interest was completed long ago.

I need to look at this again, because with this change, I previously
got various use-after-free. I haven't seen any issues with it, but
I agree, from a quick look that I'm not quite sure how it's currently
not causing hangs. Yet I haven't seen any, with targeted -EAGAIN
testing.

-- 
Jens Axboe