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.
