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oil pump shafted breakage/ motor over rev

Engine

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster; Year: 2006; Engine (type, size, modifications): 2.7 ; Total Mileage: 41900; Transmission: Manual;

This occured- accelerated from a traffic light in 1st gear to 4000 rpm, shifted into 2nd gear to 6700rpm then shifted to 3rd gear at 3200 rpm. Noticed a slight shudder in the motor, 5 seconds later display message said take car for service. No red light display. Delivered car to Porsche dealer. Was informed that car had overeved to 9500 rpm, one valve struck one piston head. Motor taken apart, oil pump shaft had sheared off from oil pump gear drive. Parts all over interior of motor. Trying to tie all these events together. Car was not accidently downshifted at any time at high rpm. I am in agreement that motor overeved (computor log) but am looking for the reason why. Any information assistance would be appreciated. Thanks

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