Fedora 18 changes the way how to work with services in spec files. It introduces new macros - %systemd_post, %systemd_preun and %systemd_postun; which replace scriptlets from Fedora 17 and older (see https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Systemd, https://bugzilla.redhat.com/show_bug.cgi?id=850016).
lttng-tools-2.3.0-2.fc19, lttng-ust-2.3.0-1.fc19 has been submitted as an update for Fedora 19. https://admin.fedoraproject.org/updates/lttng-tools-2.3.0-2.fc19,lttng-ust-2.3.0-1.fc19
Package lttng-tools-2.3.0-2.fc19, lttng-ust-2.3.0-1.fc19: * should fix your issue, * was pushed to the Fedora 19 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing lttng-tools-2.3.0-2.fc19 lttng-ust-2.3.0-1.fc19' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-18655/lttng-tools-2.3.0-2.fc19,lttng-ust-2.3.0-1.fc19 then log in and leave karma (feedback).
lttng-tools-2.3.0-2.fc19, lttng-ust-2.3.0-1.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.