syzbot has bisected this bug to:
commit 84e54fe0a5eaed696dee4019c396f8396f5a908b
Author: William Tu <u9012063@xxxxxxxxx>
Date: Tue Aug 22 16:40:28 2017 +0000
gre: introduce native tunnel support for ERSPAN
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=158a2f86e00000
start commit: f9f1e414 Merge tag 'for-linus-4.16-rc1-tag' of git://git.k..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=178a2f86e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=138a2f86e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=34a80ee1ac29767b
dashboard link: https://syzkaller.appspot.com/bug?extid=b2bf2652983d23734c5c
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=147bfebd800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13d8d543800000
Reported-by: syzbot+b2bf2652983d23734c5c@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
