Hi all, Recently, an issue with CONFIG_DEBUG_INFO_BTF was reported for arm64: https://groups.google.com/g/clang-built-linux/c/de_mNh23FOc/m/E7cu5BwbBAAJ $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \ LLVM=1 O=build/aarch64 defconfig $ scripts/config \ --file build/aarch64/.config \ -e BPF_SYSCALL \ -e DEBUG_INFO_BTF \ -e FTRACE \ -e FUNCTION_TRACER $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \ LLVM=1 O=build/aarch64 olddefconfig all ... FAILED unresolved symbol vfs_truncate ... My bisect landed on commit 6e22ab9da793 ("bpf: Add d_path helper") although that seems obvious given that is what introduced BTF_ID(func, vfs_truncate). I am using the latest pahole v1.20 and LLVM is at https://github.com/llvm/llvm-project/commit/14da287e18846ea86e45b421dc47f78ecc5aa7cb although I can reproduce back to LLVM 10.0.1, which is the earliest version that the kernel supports. I am very unfamiliar with BPF so I have no idea what is going wrong here. Is this a known issue? Cheers, Nathan
