linux-kernel - Re: [syzbot] WARNING in drm_gem_shmem_vm

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Date:   Fri, 20 Aug 2021 08:45:07 -0700
From:   syzbot <syzbot+91525b2bd4b5dff71619@...kaller.appspotmail.com>
To:     airlied@...ux.ie, christian.koenig@....com, daniel.vetter@...ll.ch,
        daniel.vetter@...el.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org,
        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,
        melissa.srw@...il.com, mripard@...nel.org, sumit.semwal@...aro.org,
        syzkaller-bugs@...glegroups.com, tzimmermann@...e.de
Subject: Re: [syzbot] WARNING in drm_gem_shmem_vm_open

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=11c31d55300000
start commit:   614cb2751d31 Merge tag 'trace-v5.14-rc6' of git://git.kern..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=13c31d55300000
console output: https://syzkaller.appspot.com/x/log.txt?x=15c31d55300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=96f0602203250753
dashboard link: https://syzkaller.appspot.com/bug?extid=91525b2bd4b5dff71619
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=122bce0e300000

Reported-by: syzbot+91525b2bd4b5dff71619@...kaller.appspotmail.com
Fixes: ea40d7857d52 ("drm/vkms: fbdev emulation support")

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