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Re: [Discuss-gnuradio] Debugging polar code crashes

From: Johannes Demel
Subject: Re: [Discuss-gnuradio] Debugging polar code crashes
Date: Fri, 14 Jul 2017 10:04:02 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 
Hi,
this is a tricky one. My assumption is, that the configurator block tries to compute channel capacities with a complex algorithm. There is also the BEC channel approximation, which should be called. This whole bug is caused by some GRC changes, as far as I could figure it out. Could you try to have a look into the python code of the block configurator and make sure, only the BEC functions are called? This should fix your GRC problem.
The configurator automates quite a few things regarding channel construction and has a built-in system for cached channel capacities. I assume something does not behave as expected here. 

Cheers
Johannes

On 14.07.2017 01:47, Cinaed Simson wrote:

On 07/13/2017 12:03 AM, Johannes Demel wrote:

Hi Alex,

could you be more specific about
'When I drop the POLAR code configurator block on the canvas, the
gnuradio program turns down.'?
Does GRC quit with an error? Does it turn dark and is unresponsive? Is
there anything printed on the commandline?

Cheers
Johannes


Hey, I had that problem too!

In my case, all the tests pass - I have the correct version of GSL
installed - namely 1.16

But I couldn't even load the polar grc files.

When I press open on the grc it hangs - the grc was consuming 100% of
the cpu.

Eventually I had to kill it.

I first noticed it in gnuradio-3.7.10. I'm currently running
gnuradio-3.7.12git and I just checked and the problem is still there.

And I can't generate the python code using grcc - both polar grc
examples generate errors.

-- Cinaed





On 12.07.2017 18:04, Marcus Müller wrote:

Those test failures aren't great, but I think they might be bugs in the
tests.

So, OK, can't remember what you need to do under Ubuntu to get the full
Python debugging capability in GDB, but I wrote a (slightly dated, since
the python commands have improved) tutorial on debugging crashing Python
applications [1].
The idea is to simply execute your minimal crashing example using

gdb --args python2 /path/to/flowgraph.py
(gdb) run
<wait for crash>
(gdb) backtrace

and figure out why where how things crash. If you got a backtrace, and
don't immediately see how to proceed (hint: print a few local variables,
if possible, using gdb's "print" command), share it with the mailing list

Best regards,
Marcus

[1]https://wiki.gnuradio.org/index.php/TutorialsGDB
On 07/12/2017 05:50 PM, Alex Homero Rivadeneira Erazo wrote:

I am using ubuntu 16.04 LTS.

At the end of the make test, I have obtained some failures:

97% tests passed, 6 tests failed out of 218

Total Test time (real) = 142.49 sec

The following tests FAILED:
48 - qa_ctrlport_probes (Failed)
59 - qa_cpp_py_binding (Failed)
76 - qa_cpp_py_binding_set (Failed)
124 - qa_filterbank (Failed)
154 - qa_ofdm_txrx (Failed)
197 - qa_fading_model (Failed)
Errors while running CTest
Makefile:61: recipe for target 'test' failed
make: *** [test] Error 8

Best regards,

Alex






On Wed, Jul 12, 2017 at 11:46 AM, Marcus Müller
<address@hidden <mailto:address@hidden>> wrote:

    That might still give us enough debug info. Which Linux distro are
    we talking about (or, is it Linux at all?)

    Best regards,

    Marcus


    On 07/12/2017 05:30 PM, Alex Homero Rivadeneira Erazo wrote:

    Hi Marcus

    At this moment, I am installing the
    gnuradio 3.7.12git-171-get72c77bc from source, which is the same
    that I installed with pybombs . Unfortunately, I just already
    built the gnuradio with "make && make test". The gnuradio that I
    had with the standard installation was gnuradio 3.7.9

    Thanks

    Best regards,

    Alex




    On Wed, Jul 12, 2017 at 11:13 AM, Marcus Müller
    <address@hidden <mailto:address@hidden>> wrote:

        Hi Alex,

        that does indeed sound like a bug. Things shouldn't be
crashing!

        So, what's the distribution you're working with? Maybe I can
        help you a bit with the debugging. If you're, at the moment,
        building GNU Radio, make sure that the CMake parameters
        contain -DCMAKE_BUILD_TYPE=RelWithDebInfo , so that we get
        debugging symbols :)

        Best regards,

        Marcus


        On 07/12/2017 05:11 PM, Alex Homero Rivadeneira Erazo wrote:

        Hi Marcus

        Based on your suggestion I have deleted my Nabbles account.

        Respect to my problem with the POLAR code
        configurator block, I checked the discussion threads, but
        anyone gave a solution.

        Note that this problem does not happen with
        a gnuradio installed with the distribution's package manager
        (standard installation). However, the problem with this
        installation method is that gnuradio is not up to date and
        it does not have all the blocks that I need in my work. That
        is why I used pybombs to install gnuradio which has the
        blocks that I need. Now the problem is that gnuradio with
        pybombs does work with the POLAR code configurator block.
        When I drop the POLAR code configurator block on the canvas,
        the gnuradio program turns down.

        At this moment, I am installing gnuradio from source. If you
        have other ideas please tell me.

        Thanks

        Best regards,

        Alex



        On Wed, Jul 12, 2017 at 9:43 AM, Marcus Müller
        <address@hidden <mailto:address@hidden>>
        wrote:

            Hi Alex,

            I hope you do get an answer, but that mail from Jose is
            from the
            beginning of 2016 – not extremely likely.

            Anyway, have you seen the other answers that Jose got?
            If not: That's Nabble's fault. I never tire to repeat:
            Nabble is just a terrible, terrible web frontend to use
            the official GNU
            Radio Mailing list.

            It's not the official mailing list archive. It never
            was, and it never
            will be. The official way to sign up for the mailing
list is

            https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
            <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>

            and there's a link to the official mailing list archive,
            too.

            I'd recommend deleting your Nabble account, and directly
            signing up
            under the above address with your email account. It's
            really easier to
            use a proper email client (eg. GMail's web frontend) and
            simply the
            mails than Nabble. Nabble breaks discussion threads, it
            makes answers
            invisible, and it has cost us hours and hours of
            unnecessary work so
            far. PLEASE, don't use Nabble.

            Best regards,

            Marcus


            On 07/12/2017 01:52 PM, Alex Rivadeneira wrote:
            > Dear Jose
            >
            > Can you tell me if you solved the problem with the
            POLAR code configurator
            > block? because I have the same problem in the gnuradio
            installed with
            > pybombs.
            >
            > Thanks
            >
            > Alex
            >
            >
            >
            > --
            > View this message in context:

http://gnuradio.4.n7.nabble.com/polar-code-example-tp58407p64520.html

<http://gnuradio.4.n7.nabble.com/polar-code-example-tp58407p64520.html>

            > Sent from the GnuRadio mailing list archive at
Nabble.com.
            >
            > _______________________________________________
            > Discuss-gnuradio mailing list
            > address@hidden
<mailto:address@hidden>
            >
            https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
            <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>


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        --
        Regards,

        Alex Homero Rivadeneira E.
        Cell: 438 397-8330 <tel:%28438%29%20397-8330>





    --
    Regards,

    Alex Homero Rivadeneira E.
    Cell: 438 397-8330 <tel:%28438%29%20397-8330>





--
Regards,

Alex Homero Rivadeneira E.
Cell: 438 397-8330




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