  In this paper, we address the problem of causality violation in the solutions
of Einstein equations and seek possible causality restoration mechanisms in
modifed theories of gravity. We choose for the above problem, the causality
violation due to the existence of closed time-like curves in the context of
Kerr-Newman black hole. We first revisit and quantify the details of the
causality violation in the Kerr-Newman spacetime. We then show that the issue
is also existent in two of the modified solutions to the Kerr Newman spacetime:
The Non-Commutativity inspired solution and the f(R)-Gravity modifed solution.
We explore the possibility of mechanisms present within the model that prevent
causality violation. We show that, in both the models, the model parameters can
be chosen such that the causality violating region is eliminated. We argue that
in the context of non commutativity inspired solution, the non commutativity
parameter can be chosen such that the causality violating region is eliminated
and the inner horizon is no longer the Cauchy horizon. We then discuss the
geodesic connectivity of the causality violating region in both the scenarios
and quantify the geodesics that have points in the causality violating regions.
We also discuss the causal aspects of Kerr Newman deSitter/antideSitter
spacetimes.
