Your message dated Thu, 4 Sep 2014 07:55:01 +0100
with message-id <20140904065501.gf19...@lt91-43.eecs.qmul.ac.uk>
and subject line Re: Bug#760057: commons-math3: FTBFS - test 
KohonenUpdateActionTest fails
has caused the Debian Bug report #760057,
regarding commons-math3: FTBFS - test KohonenUpdateActionTest fails
to be marked as done.

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-- 
760057: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=760057
Debian Bug Tracking System
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--- Begin Message ---
Package: commons-math3
Version: 3.3-1
Severity: serious
Usertags: goto-cc

During a rebuild of all Debian packages in a clean sid chroot (using cowbuilder
and pbuilder) the build failed with the following error.

[...]
Results :

Failed tests:   
testUpdate(org.apache.commons.math3.ml.neuralnet.sofm.KohonenUpdateActionTest): 
expected:<0.0> but was:<5.551115123125783E-17>

Tests run: 5974, Failures: 1, Errors: 0, Skipped: 42

[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] There are test failures.

Please refer to 
/srv/jenkins-slave/workspace/sid-goto-cc-commons-math3/commons-math3-3.3/target/surefire-reports
 for the individual test results.
[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5 minutes 5 seconds
[INFO] Finished at: Sun Aug 31 10:48:48 UTC 2014
[INFO] Final Memory: 27M/1963M
[INFO] ------------------------------------------------------------------------
/usr/share/cdbs/1/class/maven.mk:87: recipe for target 'mvn-build' failed
make: *** [mvn-build] Error 1


The full build log is attached; please do let me know if the problem is
unreproducible, in which case I shall try to investigate further.

Best,
Michael

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Description: application/gunzip

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--- End Message ---
--- Begin Message ---
Hi again,

[...]
> Attached are my build logs.
> 
> I don't know for sure how floating point/doubles are represented in the
> JVM, but maybe they're mapped directly to the hardware in some
> circumstances, and so we're seeing a discrepancy between a literal 0 and
> some calculated/underflowed value that is vanishingly small.
> 
> Something along the lines of:
> 
> (a - b) == 0 is true
> 
> However:
> 
> x = (a - b)
> x == 0 is false
> 
> In any event, maybe an issue to report upstream if we can narrow down
> the use case.  Maybe it depends on the microcode on the processor?
> (Okay, I'm totally just guessing now... :)
> 
[...]

Thanks a lot for sending through your build logs. There were minor differences
in the packages being installed, but this may be due to my chroot having been
24h or so older.

So now I re-tried the build, and couldn't actually reproduce the problem
anymore, even when run on the very same build slave, and with the very same
chroot (just re-checked the build logs, and the diff is really just the
timestamps).

Thus I'm closing this bug report, and will re-open it should the failure ever
manifest again.

Sorry for the noise,
Michael

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