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  • Bug#1094138: udptunnel: flaky autopkgtest on s390x: UDPTunnel communica

    From Marcos Talau@21:1/5 to Paul Gevers on Mon Feb 24 21:50:02 2025
    Hi there!

    On Sat, Feb 22, 2025 at 08:16:08PM +0100, Paul Gevers wrote:
    [...]
    To align a time, it easiest to do that on IRC in #debci on oftc. Does that work for you?

    (Either I or terceiro needs to be on-line while you do this).

    Paul

    Thanks Paul, terceiro provided access to a testbed.

    I confirmed the problem and I was able to find a solution.
    Changing udp client from ncat (nmap pkg) to socat fixes the issue.
    I ran the tests 100 times and every time it ran successfully.

    In the past [1] something similar happened with ncat.
    [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1039613


    Best regards,
    mt






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  • From Marcos Talau@21:1/5 to All on Mon Mar 10 20:20:02 2025
    Control: reassign 1094138 nmap

    Hi there!

    I ran the udptunnel test in a s390x testbed without udptunnel, I only used ncat, and sometimes, it fails.

    I write some scripts [1] to help with the ncat tests. I ran for 100 times
    the script "test-ncat-udp-series.sh", resulting in 10k tests.
    [1] https://people.debian.org/~talau/tmp/test-ncat-udp

    10k tests (using "test-ncat-udp-series.sh") results in a porterbox s390x:
    - Fail: Avg: 3.01%, StdDev: 2.15636

    10k tests (using "test-ncat-udp-series.sh") results in a porterbox amd64:
    - Fail: Avg: 0.12%, StdDev: 0.381576

    After the tests, I decided to make tests changing ncat client to socat client, scripts (test-ncat-udp_socat-client-series.sh, test-ncat-udp_socat-client.sh). Below the results:

    10k tests (using "test-ncat-udp_socat-client-series.sh") results in a
    porterbox s390x:
    - Fail: Avg: 0.0%, StdDev: 0

    10k tests (using "test-ncat-udp_socat-client-series.sh") results in a
    porterbox amd64:
    - Fail: Avg: 0.0%, StdDev: 0

    Analyzing the results, it can be seen that communication using ncat-client and ncat-server presents failures. By changing ncat-client to socat, communications no longer present failures. This indicates to me that ncat (in client mode) has some bug.


    Best Regards,
    mt

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  • From Marcos Talau@21:1/5 to Sven Geuer on Mon Mar 24 21:10:01 2025
    Hey Sven!

    On Mon, Mar 24, 2025 at 12:03:09AM +0100, Sven Geuer wrote:
    Control: reassign -1 src:udptunnel

    Hi Marcos!

    [...]

    With these changes applied transmission failures vanish in my setup. I suggest you try this in your environment(s), potentially with an
    increased delay.


    I run the tests (test-ncat-udp-series.sh x 100) again using the extra sleep on barriere and zelenka, and I got 0% of failures. Thanks!!


    Best Regards,
    mt

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