syzbot suspects this issue was fixed by commit:
commit 033724d6864245a11f8e04c066002e6ad22b3fd0
Author: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
Date: Wed Jul 15 01:51:02 2020 +0000
fbdev: Detect integer underflow at "struct fbcon_ops"->clear_margins.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=156ad38e900000
start commit: 7cc2a8ea Merge tag 'block-5.8-2020-07-01' of git://git.ker..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=183dd243398ba7ec
dashboard link: https://syzkaller.appspot.com/bug?extid=7748c5375dc20dfdb92f
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1469d28f100000
If the result looks correct, please mark the issue as fixed by replying with:
#syz fix: fbdev: Detect integer underflow at "struct fbcon_ops"->clear_margins.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
