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From: Jakub Sitnicki <jakub@cloudflare.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: bpf <bpf@vger.kernel.org>, Networking <netdev@vger.kernel.org>,
	kernel-team@cloudflare.com
Subject: Re: [PATCH bpf-next v5 12/12] selftests/bpf: Tests for SOCKMAP holding listening sockets
Date: Thu, 12 Mar 2020 18:25:25 +0100	[thread overview]
Message-ID: <87r1xxxz7e.fsf@cloudflare.com> (raw)
In-Reply-To: <CAEf4BzbSrnwq7ZC1j5YrqdJGO9bhgw=gpBmuTNP1UQFnDKABgA@mail.gmail.com>

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@cloudflare.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@cloudflare.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@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
>>
>> 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.

[...]

  reply	other threads:[~2020-03-12 17:25 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-27 12:55 [PATCH bpf-next v5 00/12] Extend SOCKMAP to store " Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 01/12] bpf, sk_msg: Don't clear saved sock proto on restore Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 02/12] net, sk_msg: Annotate lockless access to sk_prot on clone Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 03/12] net, sk_msg: Clear sk_user_data pointer on clone if tagged Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 04/12] tcp_bpf: Don't let child socket inherit parent protocol ops on copy Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 05/12] bpf, sockmap: Allow inserting listening TCP sockets into sockmap Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 06/12] bpf, sockmap: Don't set up sockmap progs for listening sockets Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 07/12] bpf, sockmap: Return socket cookie on lookup from syscall Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 08/12] bpf, sockmap: Let all kernel-land lookup values in SOCKMAP Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 09/12] bpf: Allow selecting reuseport socket from a SOCKMAP Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 10/12] net: Generate reuseport group ID on group creation Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 11/12] selftests/bpf: Extend SK_REUSEPORT tests to cover SOCKMAP Jakub Sitnicki
2020-01-27 12:55 ` [PATCH bpf-next v5 12/12] selftests/bpf: Tests for SOCKMAP holding listening sockets Jakub Sitnicki
2020-03-11 18:48   ` Andrii Nakryiko
2020-03-11 19:49     ` Jakub Sitnicki
2020-03-11 21:02       ` Andrii Nakryiko
2020-03-12 17:25         ` Jakub Sitnicki [this message]
2020-01-27 13:01 ` [PATCH bpf-next v5 00/12] Extend SOCKMAP to store " Jakub Sitnicki
2020-01-27 13:05 ` Jakub Sitnicki

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