[Discuss-gnuradio] Fwd: Random test failures when compiling GNURadio from source

151/213 Testing: qa_constellation_receiver
151/213 Test: qa_constellation_receiver
Command: "/bin/sh" "/tmp/workarea-gnuradio/gnuradio/build/gr-digital/python/digital/qa_constellation_receiver_test.sh"
Directory: /tmp/workarea-gnuradio/gnuradio/build/gr-digital/python/digital
"qa_constellation_receiver" start time: Oct 30 19:53 UTC
Output:
----------------------------------------------------------
F.
======================================================================
FAIL: test_basic (__main__.test_constellation_receiver)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/tmp/workarea-gnuradio/gnuradio/gr-digital/python/digital/qa_constellation_receiver.py", line 132, in test_basic
self.assertTrue(correct > req_correct)
AssertionError: False is not true

----------------------------------------------------------------------
Ran 2 tests in 0.725s

FAILED (failures=1)
Constellation is <constellation expl rect (m=32)>. Differential is True. Required correct is 0.8. Correct is 0.773026315789. FAIL.
<end of output>
Test time = 1.62 sec
----------------------------------------------------------
Test Failed.
"qa_constellation_receiver" end time: Oct 30 19:53 UTC
"qa_constellation_receiver" time elapsed: 00:00:01
----------------------------------------------------------

Hello,

We have been trying to compile and run GNURadio from source and the make tests have been failing randomly.

Machine Details

Intel NUC (x86-64 machine)

Ubuntu 16.04.03

GNU Radio version 3.7.11

gcc version 5.4.0 20160609

Commands used

git clone --recursive https://github.com/gnuradio/gnuradio

git checkout v3.7.11

mkdir build

cd build

cmake -DENABLE_GR_QTGUI=OFF -DCMAKE_INSTALL_PREFIX=/usr/local ../

make -j4

make test

Out of every 4 compilations, 1/2 would fail the make test e.g qa_constellation_receiver(attached error with email) or
qa_ofdm_sync_sc_cfb. Our fix so far has been to re-run the build with no modifications and the tests pass.

I have seen similar errors pop up in the mailing lists and the cause is usually incorrect setting of seed.
e.g https://lists.gnu.org/archive/html/discuss-gnuradio/2012-04/msg00318.html

Does this issue still persist? or known?

--

Regards

Kevin