syzbot has bisected this issue to:
commit 58956317c8de52009d1a38a721474c24aef74fe7
Author: David Ahern <dsahern@xxxxxxxxx>
Date: Fri Dec 7 20:24:57 2018 +0000
neighbor: Improve garbage collection
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=146ba853900000
start commit: 746f534a tools/libbpf: Avoid counting local symbols in ABI..
git tree: bpf
final oops: https://syzkaller.appspot.com/x/report.txt?x=166ba853900000
console output: https://syzkaller.appspot.com/x/log.txt?x=126ba853900000
kernel config: https://syzkaller.appspot.com/x/.config?x=a0437fdd630bee11
dashboard link: https://syzkaller.appspot.com/bug?extid=721aa903751db87aa244
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=128ff37d900000
Reported-by: syzbot+721aa903751db87aa244@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 58956317c8de ("neighbor: Improve garbage collection")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
