systemd bugs again and again

[Reindl Harald]

i am tired of ignored bugs in core components like
https://bugzilla.redhat.com/show_bug.cgi?id=1226509

how to reproduce?

just use "RuntimeDirectory" and "ExecStartPost" in a systemd-unit and

stop the service every hour on each machine for backups, you will have a 
few failed starts each day

Jul  4 03:18:54 backup-arrakis systemd: Failed at step RUNTIME_DIRECTORY 
spawning /usr/libexec/mysqld-wait-ready: File exists
Jul  4 03:18:54 backup-arrakis systemd: Failed to start MariaDB Database.
Jul  4 03:18:54 backup-arrakis systemd: Unit mysqld.service entered 
failed state.
Jul  4 03:18:54 backup-arrakis systemd: mysqld.service failed.
Jul  4 08:17:54 backup-arrakis systemd: Failed at step RUNTIME_DIRECTORY 
spawning /usr/libexec/mysqld: File exists
Jul  4 08:17:54 backup-arrakis systemd: Failed to start MariaDB Database.
Jul  4 08:17:54 backup-arrakis systemd: Unit mysqld.service entered 
failed state.
Jul  4 08:17:54 backup-arrakis systemd: mysqld.service failed.