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Arch Linux ships a stripped ld-linux-x86-64.so.2, so Valgrind cannot find the memcmp/memcpy/strlen symbols it must redirect and exits at startup with "Fatal error at startup: a function redirection which is mandatory for this platform-tool combination cannot be set up". debuginfod is already installed in the image but was never wired up. Set DEBUGINFOD_URLS to the official Arch debuginfod server so Valgrind fetches the missing glibc debug symbols on demand and caches them.