linux-kernel - Re: [syzbot] WARNING in io_poll_double

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Date:   Mon, 20 Sep 2021 10:16:06 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+f2aca089e6f77e5acd46@...kaller.appspotmail.com>
Cc:     asml.silence@...il.com, axboe@...nel.dk, haoxu@...ux.alibaba.com,
        hdanton@...a.com, io-uring@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] WARNING in io_poll_double_wake

On Mon, 30 Aug 2021 at 13:34, syzbot
<syzbot+f2aca089e6f77e5acd46@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit a890d01e4ee016978776e45340e521b3bbbdf41f
> Author: Hao Xu <haoxu@...ux.alibaba.com>
> Date:   Wed Jul 28 03:03:22 2021 +0000
>
>     io_uring: fix poll requests leaking second poll entries
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15d8819d300000
> start commit:   98f7fdced2e0 Merge tag 'irq-urgent-2021-07-11' of git://gi..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=139b08f9b7481d26
> dashboard link: https://syzkaller.appspot.com/bug?extid=f2aca089e6f77e5acd46
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11650180300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1510c6b0300000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: io_uring: fix poll requests leaking second poll entries
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Looks sane (io_uring commit fixes an issue in io_uring):

#syz fix: io_uring: fix poll requests leaking second poll entries