$ rpmquery -p --qf '%{preun}\n' mdadm-2.6-alt2.i586.rpm /usr/sbin/preun_service mdadm # rpmi -e mdadm Usage: mdadm {start|stop|status|restart|condrestart} This happens because /etc/init.d/mdadm does not support "condstop" parameter used by /usr/sbin/preun_service.
Fixed in 2.6.1-*.