linux-kernel - Re: WARNING in percpu_ref

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Message-ID: <CACT4Y+YeEVViLbJXOogzer+3MqtrMuFpt9-kj+1UENJw7uyAAw@mail.gmail.com>
Date:   Wed, 11 Nov 2020 14:30:52 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+8c4a14856e657b43487c@...kaller.appspotmail.com>,
        io-uring@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING in percpu_ref_exit (2)

On Wed, Nov 11, 2020 at 4:09 AM syzbot
<syzbot+8c4a14856e657b43487c@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit c1e2148f8ecb26863b899d402a823dab8e26efd1
> Author: Jens Axboe <axboe@...nel.dk>
> Date:   Wed Mar 4 14:25:50 2020 +0000
>
>     io_uring: free fixed_file_data after RCU grace period
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=161ea46e500000
> start commit:   63849c8f Merge tag 'linux-kselftest-5.6-rc5' of git://git...
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4527d1e2fb19fd5c
> dashboard link: https://syzkaller.appspot.com/bug?extid=8c4a14856e657b43487c
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13c30061e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1251b731e00000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: io_uring: free fixed_file_data after RCU grace period
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: io_uring: free fixed_file_data after RCU grace period