linux-kernel - Re: [syzbot] [io-uring?] WARNING in __io_submit_flush

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Message-ID: <bb2cb6bd-d2ec-4378-bf9d-339571f7c53a@gmail.com>
Date: Sun, 5 Jan 2025 13:52:29 +0000
From: Pavel Begunkov <asml.silence@...il.com>
To: syzbot <syzbot+1bcb75613069ad4957fc@...kaller.appspotmail.com>,
 axboe@...nel.dk, io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
 syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] WARNING in __io_submit_flush_completions

On 12/24/24 13:57, Pavel Begunkov wrote:
> On 12/20/24 18:15, syzbot wrote:
>>
>> HEAD commit:    8faabc041a00 Merge tag 'net-6.13-rc4' of git://git.kernel...
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=13249e0f980000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=c22efbd20f8da769
>> dashboard link: https://syzkaller.appspot.com/bug?extid=1bcb75613069ad4957fc
>> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12172fe8580000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=111f92df980000
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/0bdb6cecaf61/disk-8faabc04.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/98b22dfadac0/vmlinux-8faabc04.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/65a511d3ba7f/bzImage-8faabc04.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+1bcb75613069ad4957fc@...kaller.appspotmail.com
> 
> I can't reproduce but it makes sense. It shouldn't be a real
> problem as it's protected by ->uring_lock

#syz test: https://github.com/isilence/linux.git syz/get-cqe-lockdep

-- 
Pavel Begunkov