[hegelstoleit]

Obviously rust panic is not the same as a kernel panic. What you're taking for granted is that just because rust can catch a panic that it will. A simple overflow can cause a panic. When this happens, the panic might be caught before the kernel panics, but by then the program is probably already in an undefined state. It also might not be caught at all, and cause an actual kernel panic.

[lifthrasiir]

The program is in a defined but undesirable state, both when panic occurred in Rust and when a "simple" uncontrolled overflow happened in C (provided that the compiler is configured to not treat it as an UB, otherwise it'd be worse). And anyone doing Rust-C interop already has to be conscious about the language boundary, which happens to be a perfect place to catch Rust panics.