[syzbot] kernel BUG in vmf_insert_pfn_prot

[Dmitry Vyukov]

On Tue, 13 Jun 2023 at 21:23, syzbot
<syzbot+2d4f8693f438d2bd4bdb at syzkaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit a5b44c4adb1699661d22e5152fb26885f30a2e4c
> Author: Thomas Zimmermann <tzimmermann at suse.de>
> Date:   Mon Mar 20 15:07:44 2023 +0000
>
>     drm/fbdev-generic: Always use shadow buffering
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1025ee07280000
> start commit:   0326074ff465 Merge tag 'net-next-6.1' of git://git.kernel...
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d323d85b1f8a4ed7
> dashboard link: https://syzkaller.appspot.com/bug?extid=2d4f8693f438d2bd4bdb
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14fd1182880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17567514880000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: drm/fbdev-generic: Always use shadow buffering
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Looks reasonable:

#syz fix: drm/fbdev-generic: Always use shadow buffering