Track reconstruction of real cosmic muon events with CMS tracker detector

The CMS Silicon Strip Tracker (SST) construction has been completed on March 2007. From then to July 2007 the SST has gone through of a long series of tests, involving the cosmic ray data taking. Track reconstruction has been performed with three track finders. We will talk about the so called Combinatorial Track Finder, one of the default CMS track finders, and about its generalization to the cosmic ray case. For the first time this algorithm has been run on real data, both online and offline. Tracking performances on simulated and real data will be discussed.