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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
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