Messages in this thread | | | From | Avi Kivity <> | Subject | Spurious EIO on AIO+DIO+RWF_NOWAIT | Date | Sun, 9 Dec 2018 13:19:51 +0200 |
| |
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.
| |