Re: [syzbot] WARNING: suspicious RCU usage in __dev_queue_xmit

syzbot [off-list ref] 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