However, there are a few scenarios where this might come up, and I’ll point you to helpful resources. If you’re actually trying to use getuid in a seccomp / sandboxed environment (like Docker, bubblewrap, or a custom seccomp profile) or with Linux capabilities dropped, getuid can be blocked even though it’s normally allowed.
It sounds like you're encountering a situation where a getuid syscall on an x64 system is requiring administrator (root) privileges — which is unusual, because getuid normally just returns the real user ID and does require special permissions. getuid-x64 require administrator privileges