Re: [Discuss-gnuradio] make test failure at qa_constellation_receiver

[Ben Reynwar]

2012/4/12 Alick Zhao <address@hidden>:
> Hi all,
>
> Recently I have upgraded my gnuradio build to v3.5.3 on several
> computers, and I find that on two machines with Ubuntu 11.10, make test
> will fail the test qa_constellation_receiver while on the other two with
> Fedora 16 all tests are passed.
>
> To investigate the problem, I add one line in the file
> `gr-digital/python/qa_constellation_receiver.py` which just print the
> value of constellation, differential, and correct before the assert.
> Then I run the script
> `build/gr-digital/python/qa_constellation_receiver_test.sh`. The output
> is recorded and attached below. Among them:
>
> * test.t41.log is from a Thinkpad T41 with Ubuntu 11.10 32bit installed,
> * test.t60.log is from a Thinkpad T60 with Ubuntu 11.10 32bit installed,
> * test.f16.log is from a HP 6531s with Fedora 16 x86_64 installed.
>
> Hope these logs are helpful to diagnose the problem.
>
> PS: As a side note, my debugging line's output appears later than the
> result, which is not the case for screen output. I think this is
> probably related to stdout buffering.
>
> PS2: I once changed the REQ_CORRECT to 0.7 on one Ubuntu machine,
> and then made the test passed. I wonder if it is a valid fix.
>
> alick
>
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It sounds like this is definitely a bug, but it's hard for me to track
it down because I can't replicate it.  Does the bug still occur if you
set FREQUENCY_OFFSET = 0 in the test case?