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=1325d967d00000
start commit: af5043c8 Merge tag 'acpi-5.10-rc4' of git://git.kernel.org..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=f9aa2432c01bcb1f
dashboard link: https://syzkaller.appspot.com/bug?extid=305a91e025a73e4fd6ce
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=130152a1500000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=102b1bba500000
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
