bschaefer@bschaefer-ThinkPad-T430:test$ sudo ./testalpha 
[1432844408.396667] <ERROR> MirBufferStreamAPI: Caught exception at client library boundary (in mir_buffer_stream_get_graphics_region): /build/buildd/mir-0.13.1+15.10.20150520/src/platforms/mesa/client/client_buffer.cpp(63): Throw in function {anonymous}::ShmMemoryRegion::ShmMemoryRegion(const std::shared_ptr<mir::client::mesa::BufferFileOps>&, int, const mir::geometry::Size&, mir::geometry::Stride, MirPixelFormat)
Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
std::exception::what: Failed to mmap buffer
13, "Permission denied"