syzbot has bisected this issue to:
commit a0b0fd53e1e67639b303b15939b9c653dbe7a8c4
Author: Bart Van Assche <bvanassche@xxxxxxx>
Date: Thu Feb 14 23:00:46 2019 +0000
locking/lockdep: Free lock classes that are no longer in use
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16c0c84ea80000
start commit: bfa3037d8280 Merge tag 'fuse-update-6.5' of git://git.kern..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=15c0c84ea80000
console output: https://syzkaller.appspot.com/x/log.txt?x=11c0c84ea80000
kernel config: https://syzkaller.appspot.com/x/.config?x=27e33fd2346a54b
dashboard link: https://syzkaller.appspot.com/bug?extid=c2b68bdf76e442836443
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111c904ea80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116b0faaa80000
Reported-by: syzbot+c2b68bdf76e442836443@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: a0b0fd53e1e6 ("locking/lockdep: Free lock classes that are no longer in use")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
