syzbot suspects this bug was fixed by commit:
commit 32c72165dbd0e246e69d16a3ad348a4851afd415
Author: Kadlecsik J?zsef <kadlec at blackhole.kfki.hu>
Date: Sun Jan 19 21:06:49 2020 +0000
netfilter: ipset: use bitmap infrastructure completely
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17079245e00000
start commit: 8f8972a3 Merge tag 'mtd/fixes-for-5.5-rc7' of
git://git.ke..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=d9290aeb7e6cf1c4
dashboard link: https://syzkaller.appspot.com/bug?extid=b554d01b6c7870b17da2
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=145948d6e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16202cc9e00000
If the result looks correct, please mark the bug fixed by replying with:
#syz fix: netfilter: ipset: use bitmap infrastructure completely
For information about bisection process see: https://goo.gl/tpsmEJ#bisection