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 [off-list ref] 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@cloudflare.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!