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

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Date:   Thu, 12 Mar 2020 18:25:25 +0100
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@...udflare.com
Subject: Re: [PATCH bpf-next v5 12/12] selftests/bpf: Tests for SOCKMAP holding listening sockets

On Wed, Mar 11, 2020 at 10:02 PM CET, Andrii Nakryiko wrote:
> On Wed, Mar 11, 2020 at 12:49 PM Jakub Sitnicki <jakub@...udflare.com> wrote:
>>
>> On Wed, Mar 11, 2020 at 07:48 PM CET, Andrii Nakryiko wrote:
>> > 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
>>
>> Hey Andrii,
>>
>> Sorry about that. Will investigate why this is happening.
>>
>> Can't say I've seen those. Any additional details about the test
>> enviroment would be helpful. Like the kernel build config and qemu
>> params (e.g. 1 vCPU vs more).
>
> It happens quite regularly for me, once every few runs locally. You
> can take a kernel config we use for Travis CI at [0].
>
>   [0] https://github.com/libbpf/libbpf/blob/master/travis-ci/vmtest/configs/latest.config

Reproduced it. This should help:

  https://lore.kernel.org/bpf/20200312171105.533690-1-jakub@cloudflare.com/T/#u

Thanks for bringing it to my attention.

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