On Mon, Feb 8, 2021 at 7:44 PM Nathan Chancellor <nathan@xxxxxxxxxx> wrote: > > 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? > I'll skip the reproduction games this time and will just request the vmlinux image. Please upload somewhere so that we can look at DWARF and see what's going on. Thanks. > Cheers, > Nathan
