Current libmv_modal_solver_test fails since rB3a7d62cd1f5e.
It appears that the issue is caused by the insertion of the new OFFSET_K4 parameter, as if camera intrinsics are not required to implement/use all of those deform parameters, they absolutely have to keep order (values) matching those defined in bundle.cc, otherwise PackIntrinisicsIntoArray and UnpackIntrinsicsFromArray mangle them around.
At least that is my understanding of the issue, and this patch seems to fix the test.