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Date: Thu, 14 Jan 2021 12:58:22 +0000 From: Qais Yousef <qais.yousef@....com> To: Jean-Philippe Brucker <jean-philippe@...aro.org> Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>, Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Steven Rostedt <rostedt@...dmis.org>, "Peter Zijlstra (Intel)" <peterz@...radead.org>, open list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH bpf-next 2/2] selftests: bpf: Add a new test for bare tracepoints On 01/13/21 17:40, Jean-Philippe Brucker wrote: > 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. I am on arm64. I honestly have no clue about this. I'll try to dig out. Thanks -- Qais Yousef
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