netdev - Re: [PATCH bpf-next v5 15/15] selftests/bpf: Tests for BPF_SK

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Message-ID: <87lfj2wvf4.fsf@cloudflare.com>
Date:   Wed, 29 Jul 2020 10:57:19 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        kernel-team <kernel-team@...udflare.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH bpf-next v5 15/15] selftests/bpf: Tests for BPF_SK_LOOKUP attach point

Hi Andrii,

On Tue, Jul 28, 2020 at 10:13 PM CEST, Andrii Nakryiko wrote:

[...]

> We are getting this failure in Travis CI when syncing libbpf [0]:
>
> ```
> ip: either "local" is duplicate, or "nodad" is garbage
>
> switch_netns:PASS:unshare 0 nsec
>
> switch_netns:FAIL:system failed
>
> (/home/travis/build/libbpf/libbpf/travis-ci/vmtest/bpf-next/tools/testing/selftests/bpf/prog_tests/sk_lookup.c:1310:
> errno: No such file or directory) system(ip -6 addr add dev lo
> fd00::1/128 nodad)
>
> #73 sk_lookup:FAIL
> ```
>
>
> Can you please help fix it so that it works in a Travis CI environment
> as well? For now I disabled sk_lookup selftests altogether. You can
> try to repro it locally by forking https://github.com/libbpf/libbpf
> and enabling Travis CI for your account. See [1] for the PR that
> disabled sk_lookup.
>
>
>   [0] https://travis-ci.com/github/libbpf/libbpf/jobs/365878309#L5408
>   [1] https://github.com/libbpf/libbpf/pull/182/commits/78368c2eaed8b0681381fc34d6016c9b5a443be8
>
>
> Thanks for your help!

"nodad is garbage" message smells like old iproute2. I will take a look.

Thanks for letting me know.