syzbot suspects this issue was fixed by commit:
commit 43016d02cf6e46edfc4696452251d34bba0c0435
Author: Florian Westphal
Date: Mon May 3 11:51:15 2021 +
netfilter: arptables: use pernet ops struct during unregister
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1325d967d
syzbot has bisected this issue to:
commit 166beccd47e11e4d27477e8ca1d7eda47cf3b2da
Author: Eric Anholt
Date: Mon Oct 3 18:52:06 2016 +
staging/vchi: Convert to current get_user_pages() arguments.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=178321a490
start commit:
