Cliff L. Biffle blogged a great write-up of a debugging odyssey at Oxide with the title Who killed the network switch? Here's the bit that jumped out at me: At the time that code was written, it was correct, but it embodied the assumption that any loaned memory would fit into one region. That assumption…

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Invariants are properties of a system that are supposed to be guaranteed not to change over time. However, due to system changes and assumptions, these invariants can become obsolete and violate the intended functionality of the code.

The problem with invariants is that they change over time