syzbot suspects this issue was fixed by commit: commit 43016d02cf6e46edfc4696452251d34bba0c0435 Author: Florian Westphal <fw@xxxxxxxxx> Date: Mon May 3 11:51:15 2021 +0000 netfilter: arptables: use pernet ops struct during unregister bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12dfdf47d00000 start commit: acf25aa6 Merge tag 'Smack-for-5.8' of git://github.com/csc.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=5263d9b5bce03c67 dashboard link: https://syzkaller.appspot.com/bug?extid=3eec59e770685e3dc879 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15bd4c1e100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1520c9de100000 If the result looks correct, please mark the issue as fixed by replying with: #syz fix: netfilter: arptables: use pernet ops struct during unregister For information about bisection process see: https://goo.gl/tpsmEJ#bisection