syzbot has bisected this bug to:

commit ab92d68fc22f9afab480153bd82a20f6e2533769 Author: Taehee Yoo ap420073@gmail.com Date: Mon Oct 21 18:47:51 2019 +0000

net: core: add generic lockdep keys

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1126f5c2e00000 start commit: 0e3f1ad8 Remove VirtualBox guest shared folders filesystem git tree: upstream final crash: https://syzkaller.appspot.com/x/report.txt?x=1326f5c2e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=1526f5c2e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=1aab6d4187ddf667 dashboard link: https://syzkaller.appspot.com/bug?extid=cd0ec5211ac07c18c049 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1171546ae00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=133ed206e00000

Reported-by: syzbot+cd0ec5211ac07c18c049@syzkaller.appspotmail.com Fixes: ab92d68fc22f ("net: core: add generic lockdep keys")

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