Yikes .. it's a deja-vu as the same thing happened with AMD's Phenom processors. The colleagues over at Fud Zilla reported that Nehalem procesors has a Translation Lookaside Buffer bug. Intel actually officialy states in its Intel Core i7 Processor, Extreme Edition Series and Intel Core i7 Processor - Specification Update PDF, that the CPU has a TLB bug.
If you open Intel