[DRE-maint] Bug#1072535: puma: flaky autopkgtest

[Paul Gevers]

Source: puma
Version: 6.4.2-4
Severity: serious
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 
showed up as regression for glibc. I noticed that it regularly fails. 
This particularly on happens on amd64, where our host is used to run 
many tests in parallel, so this may be a race condition under load.

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.

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

Paul

https://ci.debian.net/packages/p/puma/testing/amd64/47272763/

189s   1) Error:
189s TestPluginSystemd#test_systemd_notify_usr2_hot_restart_cluster:
189s Errno::EPIPE: Broken pipe
189s 
/tmp/autopkgtest-lxc.7lvlk_yq/downtmp/build.uxb/src/test/test_plugin_systemd.rb:90:in 
`write'
189s 
/tmp/autopkgtest-lxc.7lvlk_yq/downtmp/build.uxb/src/test/test_plugin_systemd.rb:90:in 
`assert_restarts_with_systemd'
189s 
/tmp/autopkgtest-lxc.7lvlk_yq/downtmp/build.uxb/src/test/test_plugin_systemd.rb:42:in 
`test_systemd_notify_usr2_hot_restart_cluster'
189s 
/tmp/autopkgtest-lxc.7lvlk_yq/downtmp/build.uxb/src/test/helper.rb:90:in 
`block (4 levels) in run'
189s     /usr/lib/ruby/3.1.0/timeout.rb:107:in `block in timeout'
189s     /usr/lib/ruby/3.1.0/timeout.rb:117:in `timeout'
189s 
/tmp/autopkgtest-lxc.7lvlk_yq/downtmp/build.uxb/src/test/helper.rb:88:in 
`block (3 levels) in run'
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