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

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Date:   Thu, 13 May 2021 02:56:08 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Florian Westphal <fw@...len.de>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+154bd5be532a63aa778b@...kaller.appspotmail.com>,
        coreteam@...filter.org, David Miller <davem@...emloft.net>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Jakub Kicinski <kuba@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        NetFilter <netfilter-devel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] WARNING in __nf_unregister_net_hook (4)

On Sat, May 08, 2021 at 04:46:57PM +0200, Florian Westphal wrote:
> Dmitry Vyukov <dvyukov@...gle.com> wrote:
> > > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > > Reported-by: syzbot+154bd5be532a63aa778b@...kaller.appspotmail.com
> > 
> > Is this also fixed by "netfilter: arptables: use pernet ops struct
> > during unregister"?
> > The warning is the same, but the stack is different...
> 
> No, this is a different bug.
> 
> In both cases the caller attempts to unregister a hook that the core
> can't find, but in this case the caller is nftables, not arptables.

I see no reproducer for this bug. Maybe I broke the dormant flag handling?

Or maybe syzbot got here after the arptables bug has been hitted?