syzbot has bisected this issue to:

commit bc0d90ee021f1baecd6aaa010d787eb373aa74dd
Author: Parav Pandit [off-list ref]
Date:   Tue Jan 5 10:32:02 2021 +0000

    vdpa: Enable user to query vdpa device info

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1440c2b0580000
start commit:   619f0b6fad52 Merge tag 'seccomp-v6.13-rc8' of git://git.ke..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1640c2b0580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1240c2b0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d1cb4a1f148c0861
dashboard link: https://syzkaller.appspot.com/bug?extid=622acb507894a48b2ce9
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=175029df980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16f29a18580000

Reported-by: syzbot+622acb507894a48b2ce9@syzkaller.appspotmail.com
Fixes: bc0d90ee021f ("vdpa: Enable user to query vdpa device info")

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