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> your greater system model has to assume it can die at any instant for any reason

Correct. This is something I have to design for in the system anyway, because in practice anything can (and does!) die at unpredictable times. It's typically an inevitable fact of life that a machine/kernel/program will occasionally die, and your system has to survive that.

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Of course it can, but the question is what this sort of termination represents. Hopefully, it represents a serious showstopper bug that gets fixed immediately! If your program is built such that call stacks don't have reasonably deterministic behavior, it's essentially impossible to build a usable model of the program as a maintainer.

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