You are unfortunately not keeping your system very well maintained. Besides what Aragorn said, i highly doubt you use ReiserFS. And Spectre-Meltdown checker is unmaintained, so it has to go too. And it is probably the thing from Git.
I won’t even mention the stable branch and AUR which is a bad idea, but probably not so much as running pamac with sudo and keeping bunch of aur orphans.
Now, since when didn’t you update the core system (sudo pacman-mirrors -f && sudo pacman -Syu )? And do you read the announcements? Looks to me you have the Polkit problem. Which was in January… (it does not help that you filled your profile with ??? so that nobody knows what kernel do you use…or at least provide inxi -zv8)