Please note that these forums are designed as a community platform, not a bug reporting channel. For bug reports you would want to use the bug reporting form linked from the CUDA registered developer website.
Note that Fedora 21 is not a supported Linux platform for CUDA 6.5 per NVIDIA’s documentation:
[url]http://docs.nvidia.com/cuda/cuda-getting-started-guide-for-linux/index.html[/url]