Re: [PATCH] Add skb_store_bytes() for BPF_PROG_TYPE_CGROUP_SKB

On Wed, Dec 29, 2021 at 06:29:05PM +0000, Tyler Wear wrote:

Unable to run any bpf tests do to errors below. These occur with and without the new patch. Is this a known issue?
Is the new test case required since bpf_skb_store_bytes() is already a tested function for other prog types?

libbpf: failed to find BTF for extern 'bpf_testmod_invalid_mod_kfunc' [18] section: -2
Error: failed to open BPF object file: No such file or directory
libbpf: failed to find BTF info for global/extern symbol 'my_tid'
Error: failed to link '/local/mnt/workspace/linux-stable/tools/testing/selftests/bpf/linked_funcs1.o': Unknown error -2 (-2)
libbpf: failed to find BTF for extern 'bpf_kfunc_call_test1' [27] section: -2

tools/testing/selftests/bpf/README.rst has details on these.

Ensure the llvm and pahole are up to date.
Also take a look at the "Testing patches" and "LLVM" section
in Documentation/bpf/bpf_devel_QA.rst.