Never mind, I fixed it by downgrading to Clang 9. It appears to be an issue with Clang/LLVM 10+ https://github.com/cilium/ebpf/issues/43 On Wed, Jun 10, 2020 at 2:38 PM Toke Høiland-Jørgensen <toke@xxxxxxxxxx> wrote: > > Elerion <elerion1000@xxxxxxxxx> writes: > > > [69] FUNC xdp_program type_id=68 vlen != 0 > > 'vlen != 0' is the error. Not sure why you hit that; what's the output > of 'bpftool btf dump file yourprog.o' ? > > -Toke >