On Mon, Feb 08, 2021 at 08:45:43PM -0800, Andrii Nakryiko wrote: > 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. > Sure thing, let me know if this works. I uploaded in two places to make it easier to grab: zstd compressed: https://github.com/nathanchance/bug-files/blob/3b2873751e29311e084ae2c71604a1963f5e1a48/btf-aarch64/vmlinux.zst uncompressed: https://1drv.ms/u/s!AsQNYeB-IEbqjQiUOspbEdXx49o7?e=ipA9Hv Cheers, Nathan
