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Subject: Re: [syzbot] WARNING in io_poll_task_func (2)
To:     syzbot <syzbot+804709f40ea66018e544@syzkaller.appspotmail.com>,
        asml.silence@gmail.com, io-uring@vger.kernel.org,
        linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com,
        xiaoguang.wang@linux.alibaba.com
References: <0000000000007a0d5705cfea99b2@google.com>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <0935df19-f813-8840-fa35-43c5558b90e7@kernel.dk>
Date:   Wed, 3 Nov 2021 17:27:26 -0600
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On 11/3/21 5:16 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    bdcc9f6a5682 Add linux-next specific files for 20211029
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=14ab0e5cb00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4b504bcb4c507265
> dashboard link: https://syzkaller.appspot.com/bug?extid=804709f40ea66018e544
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15710012b00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11862ef4b00000
> 
> The issue was bisected to:
> 
> commit 34ced75ca1f63fac6148497971212583aa0f7a87
> Author: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
> Date:   Mon Oct 25 05:38:48 2021 +0000
> 
>     io_uring: reduce frequent add_wait_queue() overhead for multi-shot poll request

Again:

#syz invalid

Please stop testing dead branches, it's pointless and just wastes time.

-- 
Jens Axboe