netdev - Re: [syzbot] WARNING: suspicious RCU usage in __dev_queue

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Date:   Mon, 10 Jan 2022 12:48:50 +0100
From:   Florian Westphal <fw@...len.de>
To:     syzbot <syzbot+e163f2ff7c3f7efd8203@...kaller.appspotmail.com>
Cc:     a@...table.cc, alobakin@...me, andrii@...nel.org, ast@...nel.org,
        atenart@...nel.org, b.a.t.m.a.n@...ts.open-mesh.org,
        bpf@...r.kernel.org, coreteam@...filter.org, daniel@...earbox.net,
        davem@...emloft.net, fw@...len.de, john.fastabend@...il.com,
        jonathan.lemon@...il.com, kadlec@...filter.org, kafai@...com,
        kpsingh@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org,
        lukas@...ner.de, mareklindner@...mailbox.ch,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, songliubraving@...com, sven@...fation.org,
        sw@...onwunderlich.de, syzkaller-bugs@...glegroups.com, yhs@...com
Subject: Re: [syzbot] WARNING: suspicious RCU usage in __dev_queue_xmit

syzbot <syzbot+e163f2ff7c3f7efd8203@...kaller.appspotmail.com> wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    4c375272fb0b Merge branch 'net-add-preliminary-netdev-refc..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=164749a9b00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=2b8e24e3a80e3875
> dashboard link: https://syzkaller.appspot.com/bug?extid=e163f2ff7c3f7efd8203
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11493641b00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11ac6aceb00000

> include/linux/netfilter_netdev.h:97 suspicious rcu_dereference_check() usage!

#syz fix: netfilter: egress: avoid a lockdep splat