See: https://github.com/mongodb/mongo/blob/f10e0ad7caf897b6444580d618e4a1e1577793d3/src/mongo/db/curop.cpp#L356-L371

On L356, we call the constructor on L363 to add the CurOp object onto the stack of active CurOp objects before initializing its _lockStatsBase member variable.

This is problematic as it makes the CurOp object available for external use before being fully initialized. For example, the currentOp command tries to access _lockStatsBase for all active CurOp objects.