/lib/systemd/system/sysinit.target.wants/udev-finish.service is in udev 215-17+deb8u7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /lib/systemd/system/sysinit.target.wants/../udev-finish.service
/lib/systemd/system/sysinit.target.wants/../udev-finish.service