bpf_program__set_attach_target() will always fail with fd=0 (attach to a kernel symbol) because obj->btf_vmlinux is NULL and there is no way to set it. Fix this by using libbpf_find_vmlinux_btf_id() (on a side note: it is unclear whether btf_vmlinux is meant to be just temporary storage for use in bpf_object__load_xattr(), or a property of bpf_object, in which case it could be initialuzed opportunistically, and properly released in bpf_object__close() ). Signed-off-by: Luigi Rizzo <lrizzo@xxxxxxxxxx> --- tools/lib/bpf/libbpf.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index a4f55f8a460d..33bf102259dd 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -10353,9 +10353,8 @@ int bpf_program__set_attach_target(struct bpf_program *prog, btf_id = libbpf_find_prog_btf_id(attach_func_name, attach_prog_fd); else - btf_id = __find_vmlinux_btf_id(prog->obj->btf_vmlinux, - attach_func_name, - prog->expected_attach_type); + btf_id = libbpf_find_vmlinux_btf_id(attach_func_name, + prog->expected_attach_type); if (btf_id < 0) return btf_id; -- 2.28.0.806.g8561365e88-goog
