linux-kernel - Re: WARNING in geneve_exit_batch

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Message-ID: <CACT4Y+aPA8byGU=rt5P9tt3wWHL8Wr3t_uiXZ5fJBzAtcc=+AA@mail.gmail.com>
Date:   Fri, 13 Mar 2020 08:30:58 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Florian Westphal <fw@...len.de>
Cc:     syzbot <syzbot+68a8ed58e3d17c700de5@...kaller.appspotmail.com>,
        coreteam@...filter.org, David Miller <davem@...emloft.net>,
        Hillf Danton <hdanton@...a.com>, Jiri Benc <jbenc@...hat.com>,
        Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
        LKML <linux-kernel@...r.kernel.org>, moshe@...lanox.com,
        netdev <netdev@...r.kernel.org>,
        NetFilter <netfilter-devel@...r.kernel.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sabrina Dubroca <sd@...asysnail.net>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: WARNING in geneve_exit_batch_net (2)

On Fri, Mar 13, 2020 at 2:45 AM Florian Westphal <fw@...len.de> wrote:
>
> syzbot <syzbot+68a8ed58e3d17c700de5@...kaller.appspotmail.com> wrote:
> > syzbot has bisected this bug to:
> >
> > commit 4e645b47c4f000a503b9c90163ad905786b9bc1d
> > Author: Florian Westphal <fw@...len.de>
> > Date:   Thu Nov 30 23:21:02 2017 +0000
> >
> >     netfilter: core: make nf_unregister_net_hooks simple wrapper again
>
> No idea why this turns up, the reproducer doesn't hit any of these code
> paths.

The attached bisection log usually makes this reasonably transparent.
It seems that in this case another kernel bug gets in the way of bisection.

> The debug splat is a false-positive; ndo_stop/list_del hasn't run yet.
> I will send a fix for net tree.
>
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