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SubjectSpurious EIO on AIO+DIO+RWF_NOWAIT
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I have an application that receives spurious EIO when running with 
RWF_NOWAIT enabled. Removing RWF_NOWAIT causes those EIOs to disappear.
The application uses AIO+DIO, and errors were seen on both xfs and ext4.


I suspect the following code:


/*
 * Process one completed BIO.  No locks are held.
 */
static blk_status_t dio_bio_complete(struct dio *dio, struct bio *bio)
{
        struct bio_vec *bvec;
        unsigned i;
        blk_status_t err = bio->bi_status;

        if (err) {
                if (err == BLK_STS_AGAIN && (bio->bi_opf & REQ_NOWAIT))
                        dio->io_error = -EAGAIN;
                else
                        dio->io_error = -EIO;
        }

Could it be that REQ_NOWAIT was dropped from bio->bi_opf? or that
bio->bi_status got changed along the way?


Reducing the test case may be a lot of work, but I can package a binary
using docker if a reproducer is needed. Seen on 4.18.19 and 4.19.something.

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