Constant EXIT_GPU_FAULT 

pub const EXIT_GPU_FAULT: i32 = 70;

Exit status for a process that died because its CUDA context was lost.

70 is sysexits.h EX_SOFTWARE. The exact value matters far less than “not zero”: supervisors gate restarts on it, and a distinct code lets an operator tell a poisoned-context death from an ordinary startup failure without reading logs.