[DRE-maint] Bug#1020435: ruby-prof: FTBFS on ppc64el

[Nilesh Patra]

On Sun, 25 Sep 2022 14:06:09 -0300 Antonio Terceiro <terceiro at debian.org> wrote:
> Control: tag -1 + unreproducible
> Control: severity -1 important
> 
> Hi,
> 
> On Wed, Sep 21, 2022 at 07:20:31PM +0200, Sebastian Ramacher wrote:
> > Source: ruby-prof
> > Version: 1.4.3-1
> > Severity: serious
> > Tags: ftbfs
> > Justification: fails to build from source (but built successfully in the past)
> > X-Debbugs-Cc: sramacher at debian.org
> > 
> > https://buildd.debian.org/status/fetch.php?pkg=ruby-prof&arch=ppc64el&ver=1.4.3-1%2Bb1&stamp=1663720013&raw=0
> > 
> >   1) Failure:
> > PrinterGraphTest#test_graph_results_sorting [/<<PKGBUILDDIR>>/test/printer_graph_test.rb:37]:
> > Array [0.171, 0.171, 0.167, 0.167, 0.166, 0.164, 0.004, 0.004, 0.002, 0.0, 0.0, 0.0, 0.0, 0.17, 0.17, 0.0, 0.0, 0.169, 0.169, 0.0, 0.0] is not sorted.
> > --- expected
> > +++ actual
> > @@ -1 +1 @@
> > -[0.171, 0.171, 0.167, 0.167, 0.166, 0.164, 0.004, 0.004, 0.002, 0.0, 0.0, 0.0, 0.0, 0.17, 0.17, 0.0, 0.0, 0.169, 0.169, 0.0, 0.0]
> > +[0.171, 0.171, 0.17, 0.17, 0.169, 0.169, 0.167, 0.167, 0.166, 0.164, 0.004, 0.004, 0.002, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
> > 
> > 
> > 51 runs, 687 assertions, 1 failures, 0 errors, 0 skips
> > rake aborted!
> > Command failed with status (1): [ruby -w -I"test" /usr/share/rubygems-integration/all/gems/rake-13.0.6/lib/rake/rake_test_loader.rb "test/abstract_printer_test.rb" "test/alias_test.rb" "test/basic_test.rb" "test/call_tree_visitor_test.rb" "test/call_trees_test.rb" "test/duplicate_names_test.rb" "test/enumerable_test.rb" "test/exceptions_test.rb" "test/exclude_methods_test.rb" "test/exclude_threads_test.rb" "test/fiber_test.rb" "test/gc_test.rb" "test/line_number_test.rb" "test/marshal_test.rb" "test/multi_printer_test.rb" "test/no_method_class_test.rb" "test/printer_call_stack_test.rb" "test/printer_call_tree_test.rb" "test/printer_flat_test.rb" "test/printer_graph_html_test.rb" "test/printer_graph_test.rb" "test/printing_recursive_graph_test.rb" "test/profile_test.rb" "test/rack_test.rb" "test/singleton_test.rb" -v]
> > /usr/share/rubygems-integration/all/gems/rake-13.0.6/exe/rake:27:in `<top (required)>'
> > Tasks: TOP => default
> > (See full trace by running task with --trace)
> > ERROR: Test "ruby3.0" failed. Exiting.
> 
> Unfortunately I could not reproduce this on the ppc64el porterbox, even
> trying the same random seed as the original build failure. I was
> suspecting an random test failure, but I didn't see this after trying 50
> builds in a row. In fact, just giving back the build on the buildd made
> it succeed. I'm not saying there is no issue, so I am keeping this open
> and maybe we will be able to figure it out at some point.
> 
> I hope you don't mind me downgrading this to important.

I am able to repro this after building a few times. Not just on ppc, but even on my x86 machine.
A similar failure occured on buildd for arm64, see here[1], but it passed after doing a giveback.

IMHO, this and probably a couple more tests are flaky tests and need to be taken care of, otherwise
they come to bite us later in freeze.

[1]: https://buildd.debian.org/status/fetch.php?pkg=ruby-prof&arch=arm64&ver=1.4.3-2&stamp=1671790522&raw=0

-- 
Best,
Nilesh
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