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Date:   Tue, 13 Oct 2020 14:59:00 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Martin KaFai Lau <kafai@...com>
Cc:     bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        Networking <netdev@...r.kernel.org>,
        Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH bpf] bpf: selftest: Fix flaky tcp_hdr_options test when
 adding addr to lo

On Tue, Oct 13, 2020 at 4:13 AM Martin KaFai Lau <kafai@...com> wrote:
>
> The tcp_hdr_options test adds a "::eB9F" addr to the lo dev.
> However, this non loopback address will have a race on ipv6 dad
> which may lead to EADDRNOTAVAIL error from time to time.
>
> Even nodad is used in the iproute2 command, there is still a race in
> when the route will be added.  This will then lead to ENETUNREACH from
> time to time.
>
> To avoid the above, this patch uses the default loopback address "::1"
> to do the test.
>
> Fixes: ad2f8eb0095e ("bpf: selftests: Tcp header options")
> Reported-by: Andrii Nakryiko <andriin@...com>
> Signed-off-by: Martin KaFai Lau <kafai@...com>
> ---

Less shelling out is always good :)

Acked-by: Andrii Nakryiko <andrii@...nel.org>

>  .../bpf/prog_tests/tcp_hdr_options.c          | 26 +------------------
>  .../bpf/progs/test_misc_tcp_hdr_options.c     |  2 +-
>  2 files changed, 2 insertions(+), 26 deletions(-)
>

[...]

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