netdev - Re: WARNING in geneve_exit_batch

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Message-ID: <20200313014435.GY979@breakpoint.cc>
Date:   Fri, 13 Mar 2020 02:44:35 +0100
From:   Florian Westphal <fw@...len.de>
To:     syzbot <syzbot+68a8ed58e3d17c700de5@...kaller.appspotmail.com>
Cc:     coreteam@...filter.org, davem@...emloft.net, fw@...len.de,
        hdanton@...a.com, jbenc@...hat.com, kadlec@...ckhole.kfki.hu,
        linux-kernel@...r.kernel.org, moshe@...lanox.com,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, sd@...asysnail.net,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de
Subject: Re: WARNING in geneve_exit_batch_net (2)

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