A segfault is considered safe if you're talking about functional safety because it results in a return to a defined safe state (RTDSS).

If a segfault leads to some other state you do not deem "safe", such as a single program gating access to a valuable asset with a default fail state of "allow", you just have a fundamental design flaw in your system. The safety problem is you or your AI agent, not the segfault.