syzbot has bisected this issue to:

commit f9006acc8dfe59e25aa75729728ac57a8d84fc32
Author: Florian Westphal [off-list ref]
Date:   Wed Apr 21 07:51:08 2021 +0000

    netfilter: arp_tables: pass table pointer via nf_hook_ops

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12500ae5b00000
start commit:   04fe99a8d936 Add linux-next specific files for 20211207
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11500ae5b00000
console output: https://syzkaller.appspot.com/x/log.txt?x=16500ae5b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4589399873466942
dashboard link: https://syzkaller.appspot.com/bug?extid=643e4ce4b6ad1347d372
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11bb96ceb00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15ad1badb00000

Reported-by: syzbot+643e4ce4b6ad1347d372@syzkaller.appspotmail.com
Fixes: f9006acc8dfe ("netfilter: arp_tables: pass table pointer via nf_hook_ops")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection