I Googled it, and here's one item I came up with:
For example he states that the mass of the blackhole being M and R describes the distance from the blackhole, but when R is equal to 0. You simply get infinity. So he states that the very centre of a blackhole, according to Einstein's equations gravity would be infinite and time itself completely stops. Also he says that all the mass of a blackhole, is contained within an infinitely small, infinitely dense point that takes up exactly 0 space at all. --
https://www.physicsforums.com/threads/michio-kaku-and-einstein.666018/
Here's another:
In the following video, world renowned physicist Michio Kaku describes the problem with the inconsistencies of general relativity. He shows that the breakdown of physical laws in a black hole. A result of infinity is a physicists nightmare. Infinity means that all laws fall apart. And when Einstein’s laws are combined with quantum mechanics, an menacing beast is formed, an infinite series of infinities. --
https://sites.psu.edu/twmalencia/2013/11/11/physics-is-having-a-nervous-breakdown-michio-kaku/
So, what's essentially being said here by Kaku is that the laws of physics
as we know them do not appear to apply at the point of infinity, and this has been theorized by a long time. It's not saying that infinity cannot be taken into consideration as a viable possibility. I have often posted that the rules that govern mega-matter and sub-atomic particles appear to be different, and that this has been verified by what we do understand about quantum mechanics. Therefore, the implication of Einstein's Relativity theories projected into infinity, not only tends to go along with this, it takes it to a point whereas all sorts of weird things, such as myriads of infinities, could possibly occur.