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Why does the following program segfault?
int main() { main(); }
Even though it is a recursion that does not end and is therefore invalid by definition, I don’t see why it segfaults (gcc 4.4.3 and clang 1.5 (trunk)).
Because every time it calls itself it allocates a little bit of stack space; eventually it runs out of stack space and segfaults. I’m a bit surprised it goes with a segfault, though; I would have expected (drum roll) stack overflow!