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=10acd273300000
start commit: c98ff1d013d2 Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=1c70e618af4c2e92
dashboard link: https://syzkaller.appspot.com/bug?extid=d6218cb2fae0b2411e9d
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=145cb2b6d00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=157b72b1d00000
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
