Libertarian socialism is not an oxymoron if you look at their separate meanings. Libertarianism actually originates as a leftist idea instead of the free-market small government idea that it's associated with now. Socialism is worker's control over the means of production, too, instead of social democracy/welfare capitalism with high taxes like most people associate the term with in the United States.
I'm a libertarian socialist, but I'm not really what people would consider a progressive, because that usually refers to Bernie-style policies.
Worker control of production would only happen through government efforts though in todays society which is not libtertarian lol