libtraceevent>=5.9-1 update requires manual intervention

The libtraceevent package prior to version 5.9-1 was missing a soname link. This has been fixed in 5.9-1, so the upgrade will need to overwrite the untracked files created by ldconfig. If you get any of these errors

libtraceevent: /usr/lib/ exists in filesystem

when updating, use

pacman -Syu --overwrite /usr/lib/

to perform the upgrade.