3060 here. I had the same issue, after some hours tinkering via live+chroot I narrowed down the issue to kernel/header/nvidia. I downgraded my whole system back to 20/09, and everything works. Now I know the root-cause I just have to find out how to update everything but nvidia 
Edit:
sudo pacman -Suy --ignore nvidia-utils --ignore nvidia-dkms --ignore lib32-nvidia-utils --ignore libxnvctrl