linux-kernel - Re: [syzbot] possible deadlock in io_worker_cancel

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Date:   Mon, 13 Dec 2021 09:06:29 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     syzbot <syzbot+b18b8be69df33a3918e9@...kaller.appspotmail.com>,
        asml.silence@...il.com, haoxu@...ux.alibaba.com,
        io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] possible deadlock in io_worker_cancel_cb

On 12/12/21 11:08 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    a763d5a5abd6 Merge tag 'scsi-fixes' of git://git.kernel.or..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12b900bab00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7d5e878e3399b6cc
> dashboard link: https://syzkaller.appspot.com/bug?extid=b18b8be69df33a3918e9
> compiler:       Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=143f7551b00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17f56825b00000
> 
> The issue was bisected to:
> 
> commit 71a85387546e50b1a37b0fa45dadcae3bfb35cf6
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Fri Dec 10 15:29:30 2021 +0000
> 
>     io-wq: check for wq exit after adding new worker task_work

#syz test git://git.kernel.dk/linux-block io_uring-5.16

-- 
Jens Axboe