netdev - Re: [libbpf] 651b775f02: kernel_selftests.bpf.test_section

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Date:   Tue, 22 Oct 2019 23:12:15 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>, lkp@...ts.01.org
Subject: Re: [libbpf] 651b775f02: kernel_selftests.bpf.test_section_names.fail

On Tue, Oct 22, 2019 at 9:25 PM kernel test robot <rong.a.chen@...el.com> wrote:
>
> FYI, we noticed the following commit (built with gcc-7):
>
> commit: 651b775f027f9758740d748cc08c5a0661f13bb7 ("[PATCH bpf-next 4/7] libbpf: teach bpf_object__open to guess program types")
> url: https://github.com/0day-ci/linux/commits/Andrii-Nakryiko/Auto-guess-program-type-on-bpf_object__open/20191021-214022
> base: https://git.kernel.org/cgit/linux/kernel/git/bpf/bpf-next.git master
>
> in testcase: kernel_selftests
> with following parameters:
>
>         group: kselftests-00
>
> test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
> test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
>
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <rong.a.chen@...el.com>

Thanks, fixed in https://patchwork.ozlabs.org/patch/1181840/

>
>
> # selftests: bpf: test_section_names
> # libbpf: failed to guess program type based on ELF section name 'InvAliD'
> # libbpf: supported section(type) names are: socket kprobe/ uprobe/ kretprobe/ uretprobe/ classifier action tracepoint/ tp/ raw_tracepoint/ raw_tp/ tp_btf/ xdp perf_event lwt_in lwt_out lwt_xmit lwt_seg6local cgroup_skb/ingress cgroup_skb/egress cgroup/skb cgroup/sock cgroup/post_bind4 cgroup/post_bind6 cgroup/dev sockops sk_skb/stream_parser sk_skb/stream_verdict sk_skb sk_msg lirc_mode2 flow_dissector cgroup/bind4 cgroup/bind6 cgroup/connect4 cgroup/connect6 cgroup/sendmsg4 cgroup/sendmsg6 cgroup/recvmsg4 cgroup/recvmsg6 cgroup/sysctl cgroup/getsockopt cgroup/setsockopt
> # test_section_names: prog: unexpected rc=-3 for InvAliD
> # libbpf: failed to guess program type based on ELF section name 'cgroup'
> # libbpf: supported section(type) names are: socket kprobe/ uprobe/ kretprobe/ uretprobe/ classifier action tracepoint/ tp/ raw_tracepoint/ raw_tp/ tp_btf/ xdp perf_event lwt_in lwt_out lwt_xmit lwt_seg6local cgroup_skb/ingress cgroup_skb/egress cgroup/skb cgroup/sock cgroup/post_bind4 cgroup/post_bind6 cgroup/dev sockops sk_skb/stream_parser sk_skb/stream_verdict sk_skb sk_msg lirc_mode2 flow_dissector cgroup/bind4 cgroup/bind6 cgroup/connect4 cgroup/connect6 cgroup/sendmsg4 cgroup/sendmsg6 cgroup/recvmsg4 cgroup/recvmsg6 cgroup/sysctl cgroup/getsockopt cgroup/setsockopt
> # test_section_names: prog: unexpected rc=-3 for cgroup
> # Summary: 38 PASSED, 2 FAILED
> not ok 18 selftests: bpf: test_section_names
>
>
> To reproduce:
>
>         # build kernel
>         cd linux
>         cp config-5.4.0-rc1-00593-g651b775f027f9 .config
>         make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage
>
>         git clone https://github.com/intel/lkp-tests.git
>         cd lkp-tests
>         bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
>
>
>
> Thanks,
> Rong Chen
>