linux-kernel - Re: general protection fault in __switch_to

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Date:   Mon, 19 Oct 2020 23:48:05 -0700
From:   syzbot <syzbot+fe6eeea133f070606074@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, bp@...en8.de, daniel.vetter@...ll.ch,
        ggherdovich@...e.cz, gregkh@...uxfoundation.org, hpa@...or.com,
        linux-kernel@...r.kernel.org, linux@...inikbrodowski.net,
        mhiramat@...nel.org, mingo@...hat.com,
        penguin-kernel@...ove.SAKURA.ne.jp,
        penguin-kernel@...ove.sakura.ne.jp, peterz@...radead.org,
        rafael.j.wysocki@...el.com, rkovhaev@...il.com,
        rostedt@...dmis.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, x86@...nel.org
Subject: Re: general protection fault in __switch_to_asm

syzbot suspects this issue was fixed by commit:

commit 033724d6864245a11f8e04c066002e6ad22b3fd0
Author: Tetsuo Handa <penguin-kernel@...ove.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