On Sun, Jan 17, 2021 at 03:29:05AM -0800, syzbot wrote:
syzbot has bisected this issue to:
commit ea40d7857d5250e5400f38c69ef9e17321e9c4a2 Author: Daniel Vetter daniel.vetter@ffwll.ch Date: Fri Oct 9 23:21:56 2020 +0000
drm/vkms: fbdev emulation support
Not sure you want to annotate this, but this just makes the bug reproducible on vkms. It's a preexisting issue (probably a few decades old) of the fbcon code afaict. It might also be that you can only repro this when you have multiple fbcon drivers (vkms plus whatever your virtual machine has I guess). -Daniel
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@syzkaller.appspotmail.com Fixes: ea40d7857d52 ("drm/vkms: fbdev emulation support")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection