debugging a segfault in my rust programhttps://jvns.ca/blog/2017/12/23/segfault-debugging/ …
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Minor correction: segfaults are completely safe in Rust. It's *not* segfaulting that's dangerous :) (example: we install a guard page after the stack to safely terminate the program with a segfault on stack overflows)
I thought segfaults are UB regardless of language? (like literally what the CPU does with SIGSEGV is undefined I thought?)
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Each cpu and OS fairly clearly documents what happens on a segfault, as far as I know. Many low-level systems (such as the rust runtime) rely on pagefaults being handled in specific ways. It's just another platform specific detail, like how to implement atomics.
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That said, most programs are operating on sufficiently high-level semantics that any pagefault is either a symptom of UB or part of a lower-level runtime optimization (CoW memory from the OS, null pointer checks in Java, stack guards in Rust, cooperative switches in Go, etc.)
End of conversation
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