Why don't we write code that just works? Or absent a "just works" set of patches, why don't we revert to code that has years of testing? This kind of "I broke things, so now I will jiggle things randomly until they unbreak" is not acceptable. [...] Don't just make random changes. There really are only two acceptable models of development: "think and analyze" or "years and years of testing on thousands of machines". Those two really do work.

Torvalds, Linus (2011-04-13). Linux 2.6.39-rc3. Retrieved on 2011-04-21.