linux-kernel - Re: [libbpf] dd4436bb83: kernel_selftests.bpf.test_section

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Date:   Mon, 28 Oct 2019 09:34:52 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     Andrii Nakryiko <andriin@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...ts.01.org,
        bpf <bpf@...r.kernel.org>
Subject: Re: [libbpf] dd4436bb83: kernel_selftests.bpf.test_section_names.fail

On Sat, Oct 26, 2019 at 10:28 PM kernel test robot
<rong.a.chen@...el.com> wrote:
>
> FYI, we noticed the following commit (built with gcc-7):
>
> commit: dd4436bb838338cfda253d7f012610a73e4078fd ("libbpf: Teach bpf_object__open to guess program types")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-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>


This was already fixed in 9bc6384b3644 ("selftests/bpf: Move
test_section_names into test_progs and fix it"), does this robot
automatically pick fixes like this and resolves the issue?

>
>
> # 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-rc1-00595-gdd4436bb83833 .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
>