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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Wed, 14 Jun 2023 09:33:01 +0200
Message-ID: <CACT4Y+bvzX7METN=jCcmY96dF-XNysYtF0s70Y2nxNNeYDUpsg@mail.gmail.com>
Subject: Re: [syzbot] kernel BUG in vmf_insert_pfn_prot
To:     syzbot <syzbot+2d4f8693f438d2bd4bdb@syzkaller.appspotmail.com>
Cc:     airlied@gmail.com, airlied@linux.ie, christian.koenig@amd.com,
        daniel.vetter@ffwll.ch, daniel.vetter@intel.com, daniel@ffwll.ch,
        dri-devel@lists.freedesktop.org, javierm@redhat.com,
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        linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org,
        linux-media@vger.kernel.org, maarten.lankhorst@linux.intel.com,
        mripard@kernel.org, suijingfeng@loongson.cn,
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        tzimmermann@suse.de, zackr@vmware.com
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On Tue, 13 Jun 2023 at 21:23, syzbot
<syzbot+2d4f8693f438d2bd4bdb@syzkaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit a5b44c4adb1699661d22e5152fb26885f30a2e4c
> Author: Thomas Zimmermann <tzimmermann@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