if the infeasibility doesn’t occur on the first iteration, but occurs in some later iteration, please read The result obtained using the SeDuMi solver is inaccurate. The optimal solution is not as good as before the optimization. - #12 by Mark_L_Stone .
Actually, read the preceding link no matter when infeasibility occurs
if infeasibility occurs on the .1st iteration, also read Debugging infeasible models - YALMIP , all of which applies to CVX, except for section 1.