linux-kernel - Re: [syzbot] Monthly io-uring report (Dec 2025)

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Message-ID: <9f1d144a-56b8-481a-bfdc-409f3b7e7e3a@kernel.dk>
Date: Thu, 4 Dec 2025 21:05:15 -0700
From: Jens Axboe <axboe@...nel.dk>
To: syzbot <syzbot+list2f3a8c0dbf1ef5c21483@...kaller.appspotmail.com>,
 io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] Monthly io-uring report (Dec 2025)

On 12/4/25 4:05 PM, syzbot wrote:
> Hello io-uring maintainers/developers,
> 
> This is a 31-day syzbot report for the io-uring subsystem.
> All related reports/information can be found at:
> https://syzkaller.appspot.com/upstream/s/io-uring
> 
> During the period, 1 new issues were detected and 1 were fixed.
> In total, 3 issues are still open and 128 have already been fixed.
> 
> Some of the still happening issues:
> 
> Ref Crashes Repro Title
> <1> 4212    No    WARNING in io_ring_exit_work (2)
>                   https://syzkaller.appspot.com/bug?extid=557a278955ff3a4d3938
> <2> 46      Yes   INFO: task hung in io_wq_put_and_exit (6)
>                   https://syzkaller.appspot.com/bug?extid=4eb282331cab6d5b6588

FWIW, I think we'll keep hitting variants of this, as syzbot tests with
tons of debugging enabled (for good reason), which slows things down a
_lot_. Then it floods the ring with work, and cancelation/exit can then
take a long time. Whenever I've tested these reproducers, they finish
quite quick. Until you enable all the gunk and run it on a slow CPU or
two. Hence not a real bug imho.

-- 
Jens Axboe