It is a good story, but I find it a truly disquieting thought that it was precisely this class of bug (race condition with an unwitting human) in the control so

It is a good story, but I find it a truly disquieting thought that it was precisely this class of bug (race condition with an unwitting human) in the control software of Therac-25 that led to the deaths of several people. As I discovered, it's a tricky one to catch in the act because one tends to be slow and methodical when bughunting.