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Development environment

Install deps (Ubuntu 24.04):

sudo apt-get install -y git build-essential clang llvm \
libelf-dev libssl-dev \
zlib1g-dev libzstd-dev pkg-config libcap-dev \
binutils-multiarch-dev curl cmake

vmlinux.h generation notes

This workspace contains a vmlinux.h header generated from the running kernel's BTF.

How it was fixed:

  • The error failed to load BTF from /sys/kernel/btf/vmlinux: Invalid argument occurred because the system bpftool (v5.15.x) was too old to parse the kernel 6.10 BTF types.
  • We built a newer bpftool from the Linux v6.10 sources, which uses a recent libbpf with support for new BTF kinds.

Steps to regenerate:

  1. Build bpftool from kernel tools: 
    git clone --depth=1 --branch v6.10 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git /tmp/linux
make -C /tmp/linux/tools/bpf/bpftool -j$(nproc)
sudo make install -C /tmp/linux/tools/bpf/bpftool
  2. Generate header: 
    /usr/local/sbin/bpftool btf dump file /sys/kernel/btf/vmlinux format c > vmlinux.h

Tip: You can also use /usr/local/sbin/bpftool btf dump file /sys/kernel/btf/vmlinux > vmlinux.json if you want to inspect raw BTF in JSON form.

bpftool version used during this run:

  • /usr/local/sbin/bpftool -V => v7.5.0, libbpf v1.5