They both always lie.
When the first one said one of them always tells the truth, that was a lie. When the other one said that one of them always lies, that was a lie too because they both always lie.
So the first one lied and the second one lied. When you asked them the question, they both lied again.
To point the direction the other one would point, they would have to point toward the safe path. They would have to lie about what the other person would already be lying about. And since the second person would lie and say the spike pit was the safe path, the first person has to say that the safe path is the spike path.
And the second person follows the same logic.
So yeh. They both always lie. That is my answer. [sub]Not that I have a riddle ready in case I'm right, rather than just waffling stupidly. =P[/sub]