Re: [bug report] WARNING: CPU: 5 PID: 679 at io_uring/io_uring.c:2835 io_ring_exit_work+0x2b6/0x2e0

[Jens Axboe <axboe@kernel.dk>]

On 4/16/24 4:00 AM, Ming Lei wrote:
> On Tue, Apr 16, 2024 at 10:26:16AM +0800, Changhui Zhong wrote:
>>>>
>>>> I can't reproduce this here, fwiw. Ming, something you've seen?
>>>
>>> I just test against the latest for-next/block(-rc4 based), and still can't
>>> reproduce it. There was such RH internal report before, and maybe not
>>> ublk related.
>>>
>>> Changhui, if the issue can be reproduced in your machine, care to share
>>> your machine for me to investigate a bit?
>>>
>>> Thanks,
>>> Ming
>>>
>>
>> I still can reproduce this issue on my machine?
>> and I shared machine to Ming?he can do more investigation for this issue?
>>
>> [ 1244.207092] running generic/006
>> [ 1246.456896] blk_print_req_error: 77 callbacks suppressed
>> [ 1246.456907] I/O error, dev ublkb1, sector 2395864 op 0x1:(WRITE)
>> flags 0x8800 phys_seg 1 prio class 0
> 
> The failure is actually triggered in recovering qcow2 target in generic/005,
> since ublkb0 isn't removed successfully in generic/005.
> 
> git-bisect shows that the 1st bad commit is cca6571381a0 ("io_uring/rw:
> cleanup retry path").
> 
> And not see any issue in uring command side, so the trouble seems
> in normal io_uring rw side over XFS file, and not related with block
> device.

Indeed, I can reproduce it on XFS as well. I'll take a look.

-- 
Jens Axboe