I hit the same "bug" on a fully loaded L2 & L3 6513.
CPU would spike to 100% everytime the topology was polled.
I disabled topology polling to resolve this issue. It is in a data center which is a static environment.
In this case, I'm not sure why one would want to poll the topology more than say once a month?
...thanks for the tip on blocking the iproute table MIB (which sounds like a different issue).