[DRE-maint] Bug#1084748: ruby-nokogiri: flaky autopkgtest on ppc64el: occasionally hangs

[Paul Gevers]

Source: ruby-nokogiri
Version: 1.16.4+dfsg-1
Severity: important
User: debian-ci at lists.debian.org
Usertags: flaky

Dear maintainer(s),

I looked at the results of the autopkgtest of your package because it 
blocks gcc-14 at this moment. I noticed that it occasionally fails on 
ppc64el because it times out after 2:47 hours while a normal test 
normally takes less than a minute.

Because the unstable-to-testing migration software now blocks on
regressions in testing, flaky tests, i.e. tests that flip between
passing and failing without changes to the list of installed packages,
are causing people unrelated to your package to spend time on these
tests. Tests that time out without doing work are not nice for our 
infrastructure.

Don't hesitate to reach out if you need help and some more information
from our infrastructure.

Paul

https://ci.debian.net/packages/r/ruby-nokogiri/testing/ppc64el/52823594/

  46s Nokogiri::XML::Node::#line#test_0005_returns a sensible line 
number for each node = 0.00 s = .
  46s Nokogiri::XML::Node::#line#test_0004_properly numbers lines with 
documents containing XML multiline comments = 0.00 s = .
10043s Nokogiri::XML::Node::#line#test_0006_supports a line number 
greater than a short int = autopkgtest [06:12:53]: ERROR: timed out on 
command "su -s /bin/bash debci -c set -e; exec 
/tmp/autopkgtest-lxc.358a4bwf/downtmp/wrapper.sh 
--artifacts=/tmp/autopkgtest-lxc.358a4bwf/downtmp/gem2deb-test-runner-artifacts 
--chdir=/tmp/autopkgtest-lxc.358a4bwf/downtmp/build.4O9/src 
--env=DEB_BUILD_OPTIONS=parallel=12 --env=DEBIAN_FRONTEND=noninteractive 
--env=LANG=C.UTF-8 --unset-env=LANGUAGE --unset-env=LC_ADDRESS 
--unset-env=LC_ALL --unset-env=LC_COLLATE --unset-env=LC_CTYPE 
--unset-env=LC_IDENTIFICATION --unset-env=LC_MEASUREMENT 
--unset-env=LC_MESSAGES --unset-env=LC_MONETARY --unset-env=LC_NAME 
--unset-env=LC_NUMERIC --unset-env=LC_PAPER --unset-env=LC_TELEPHONE 
--unset-env=LC_TIME --script-pid-file=/tmp/autopkgtest_script_pid 
--source-profile 
--stderr=/tmp/autopkgtest-lxc.358a4bwf/downtmp/gem2deb-test-runner-stderr 
--stdout=/tmp/autopkgtest-lxc.358a4bwf/downtmp/gem2deb-test-runner-stdout 
--tmp=/tmp/autopkgtest-lxc.358a4bwf/downtmp/autopkgtest_tmp -- bash -ec 
'gem2deb-test-runner --autopkgtest --check-dependencies 2>&1'" (kind: test)
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