netdev - Re: [syzbot] WARNING in __percpu_ref

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Date:   Thu, 16 Sep 2021 09:59:48 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+d6218cb2fae0b2411e9d@...kaller.appspotmail.com>
Cc:     asml.silence@...il.com, axboe@...nel.dk, coreteam@...filter.org,
        davem@...emloft.net, dsahern@...nel.org, fw@...len.de,
        hdanton@...a.com, io-uring@...r.kernel.org, kadlec@...filter.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org, ming.lei@...hat.com,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, syzkaller-bugs@...glegroups.com,
        yoshfuji@...ux-ipv6.org
Subject: Re: [syzbot] WARNING in __percpu_ref_exit (2)

On Mon, 13 Sept 2021 at 11:22, syzbot
<syzbot+d6218cb2fae0b2411e9d@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 43016d02cf6e46edfc4696452251d34bba0c0435
> Author: Florian Westphal <fw@...len.de>
> Date:   Mon May 3 11:51:15 2021 +0000
>
>     netfilter: arptables: use pernet ops struct during unregister
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10acd273300000
> start commit:   c98ff1d013d2 Merge tag 'scsi-fixes' of git://git.kernel.or..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1c70e618af4c2e92
> dashboard link: https://syzkaller.appspot.com/bug?extid=d6218cb2fae0b2411e9d
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=145cb2b6d00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=157b72b1d00000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: netfilter: arptables: use pernet ops struct during unregister
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

I guess this is a wrong commit and it was fixed by something in io_uring.
Searching for refcount fixes I see
a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 "io_uring: fix link timeout
refs".
Pavel, does it look right to you?