linux-kernel - Re: [syzbot] kernel BUG in vmf_insert_pfn

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Message-ID: <CACT4Y+bvzX7METN=jCcmY96dF-XNysYtF0s70Y2nxNNeYDUpsg@mail.gmail.com>
Date:   Wed, 14 Jun 2023 09:33:01 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+2d4f8693f438d2bd4bdb@...kaller.appspotmail.com>
Cc:     airlied@...il.com, airlied@...ux.ie, christian.koenig@....com,
        daniel.vetter@...ll.ch, daniel.vetter@...el.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, javierm@...hat.com,
        linaro-mm-sig-owner@...ts.linaro.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, suijingfeng@...ngson.cn,
        sumit.semwal@...aro.org, syzkaller-bugs@...glegroups.com,
        tzimmermann@...e.de, zackr@...are.com
Subject: Re: [syzbot] kernel BUG in vmf_insert_pfn_prot

On Tue, 13 Jun 2023 at 21:23, syzbot
<syzbot+2d4f8693f438d2bd4bdb@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit a5b44c4adb1699661d22e5152fb26885f30a2e4c
> Author: Thomas Zimmermann <tzimmermann@...e.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