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SubjectRe: general protection fault in __switch_to_asm
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syzbot suspects this issue was fixed by commit:

commit 033724d6864245a11f8e04c066002e6ad22b3fd0
Author: Tetsuo Handa <penguin-kernel@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=17f3766f900000
start commit: 04300d66 Merge tag 'riscv-for-linus-5.8-rc7' of git://git...
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=f87a5e4232fdb267
dashboard link: https://syzkaller.appspot.com/bug?extid=fe6eeea133f070606074
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1575d102900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15dd6ac0900000

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

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