netdev - Re: [PATCH bpf-next v5 12/12] selftests/bpf: Tests for SOCKMAP holding listening sockets

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Date:   Wed, 11 Mar 2020 11:48:02 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        kernel-team@...udflare.com
Subject: Re: [PATCH bpf-next v5 12/12] selftests/bpf: Tests for SOCKMAP
 holding listening sockets

On Mon, Jan 27, 2020 at 4:58 AM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> Now that SOCKMAP can store listening sockets, user-space and BPF API is
> open to a new set of potential pitfalls. Exercise the map operations (with
> extra attention to code paths susceptible to races between map ops and
> socket cloning), and BPF helpers that work with SOCKMAP to gain confidence
> that all works as expected.
>
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> ---
>  .../selftests/bpf/prog_tests/sockmap_listen.c | 1455 +++++++++++++++++
>  .../selftests/bpf/progs/test_sockmap_listen.c |   77 +
>  2 files changed, 1532 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
>  create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_listen.c
>

Hey Jakub!

I'm frequently getting spurious failures for sockmap_listen selftest.
We also see that in libbpf's Github CI testing as well. Do you mind
taking a look? Usually it's the following kinds of error:

./test_progs:connect_accept_thread:733: accept: Resource temporarily unavailable
connect_accept_thread:FAIL:733

Thanks!