On Wed, Jan 13, 2021 at 10:21:31AM +0000, Qais Yousef wrote: > On 01/12/21 12:07, Andrii Nakryiko wrote: > > > > > $ sudo ./test_progs -v -t module_attach > > > > > > > > use -vv when debugging stuff like that with test_progs, it will output > > > > libbpf detailed logs, that often are very helpful > > > > > > I tried that but it didn't help me. Full output is here > > > > > > https://paste.debian.net/1180846 > > > > > > > It did help a bit for me to make sure that you have bpf_testmod > > properly loaded and its BTF was found, so the problem is somewhere > > else. Also, given load succeeded and attach failed with OPNOTSUPP, I > > suspect you are missing some of FTRACE configs, which seems to be > > missing from selftests's config as well. Check that you have > > CONFIG_FTRACE=y and CONFIG_DYNAMIC_FTRACE=y, and you might need some > > more. See [0] for a real config we are using to run all tests in > > libbpf CI. If you figure out what you were missing, please also > > contribute a patch to selftests' config. > > > > [0] https://github.com/libbpf/libbpf/blob/master/travis-ci/vmtest/configs/latest.config > > Yeah that occurred to me too. I do have all necessary FTRACE options enabled, > including DYNAMIC_FTRACE. I think I did try enabling fault injection too just > in case. I have CONFIG_FAULT_INJECTION=y and CONFIG_FUNCTION_ERROR_INJECTION=y. Could it come from lack of fentry support on arm64 (or are you testing on x86?) Since the arm64 JIT doesn't have trampoline support at the moment, a lot of bpf selftests fail with ENOTSUPP. Thanks, Jean
