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Indeterminism in tarlz's test suite

From: Florian Schmaus
Subject: Indeterminism in tarlz's test suite
Date: Mon, 19 Apr 2021 09:33:20 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1


I maintain tarlz in Gentoo's user-maintained overlay ::guru. Recently Gentoo's automatic test mechanism reported that tarlz's test suite failed [1]. I was surprised by that, as it worked for me™. Turns out, the error occurs only sometimes. But I could easily reproduce it with

   while make check; do :; done

The output of the erroneous testsuite run is

testing tarlz-0.19...
testing --list and --extract...
testing --concatenate...
testing --create...
testing --diff...
testing --delete...
testing --dereference...
testing --append...
testing dirs and links...
testing long names...
testing bad input...tarlz: Exiting with failure status due to previous errors.
testing --keep-damaged...
tests failed.
make: *** [Makefile:88: check] Error 1

As of now, I always observed the same exit condition: 1108(5). So line 1108 iteration 5 in tarlz's check.sh script. That is

"${TARLZ}" -C dir2 -xf "${testdir}"/t155_fv${i}.tar.lz --permissive ||
        test_failed $LINENO $i

Unfortunately this is as far as I was able to approach the issue. I could not (yet) determine the root cause.

Any help would be appreciated. Thanks :)

- Florian

1: https://bugs.gentoo.org/783846

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