> usually mean the program state has become invalid. _some_ part of a program's state has become invalid. Probably a variable on the stack. In web servers, alm

> usually mean the program state has become invalid. _some_ part of a program's state has become invalid. Probably a variable on the stack. In web servers, almost always a part that becomes very irrelevant as soon as the current request ends. In databases, the same is true at transaction boundaries. In shells it's the REPL. Exit(1) in any of those deep down the stack? No thank you, wouldn't touch that software with a 10 foot pole.