linux-kernel - Re: BUG: unable to handle kernel NULL pointer dereference in fbcon

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Message-ID: <000000000000c37b3a05b916e95a@google.com>
Date:   Sun, 17 Jan 2021 03:29:05 -0800
From:   syzbot <syzbot+b67aaae8d3a927f68d20@...kaller.appspotmail.com>
To:     b.zolnierkie@...sung.com, daniel.vetter@...ll.ch,
        daniel.vetter@...el.com, dri-devel@...ts.freedesktop.org,
        george.kennedy@...cle.com, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, melissa.srw@...il.com,
        natechancellor@...il.com, sam@...nborg.org,
        syzkaller-bugs@...glegroups.com, tzimmermann@...e.de,
        yepeilin.cs@...il.com
Subject: Re: BUG: unable to handle kernel NULL pointer dereference in fbcon_cursor

syzbot has bisected this issue to:

commit ea40d7857d5250e5400f38c69ef9e17321e9c4a2
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Fri Oct 9 23:21:56 2020 +0000

    drm/vkms: fbdev emulation support

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=148e2748d00000
start commit:   b3a3cbde Add linux-next specific files for 20210115
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=168e2748d00000
console output: https://syzkaller.appspot.com/x/log.txt?x=128e2748d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6ea08dae6aab586f
dashboard link: https://syzkaller.appspot.com/bug?extid=b67aaae8d3a927f68d20
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15cd8fe0d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17af5258d00000

Reported-by: syzbot+b67aaae8d3a927f68d20@...kaller.appspotmail.com
Fixes: ea40d7857d52 ("drm/vkms: fbdev emulation support")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection