[DRE-maint] Bug#1006981: rails: flaky autopkgtest on some ci.d.n architectures

[Paul Gevers]

Source: rails
Version: 2:6.0.3.5+dfsg-1
Severity: serious
User: debian-ci at lists.debian.org
Usertags: flaky

Dear maintainer(s),

I looked at the results of the autopkgtest of you package on amd64 and 
armhf because it was showing up as a regression for the upload of 
ruby-defaults. I noticed that the test regularly fails on some 
architectures, notably armhf (which always runs on a host with lost of 
cores and RAM) and amd64 (where we have one host with lots of cores and 
RAM).

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/data/autopkgtest/testing/armhf/r/rails/19826102/log.gz

Failure:
ActiveSupport::Cache::RedisCacheStoreTests::RedisCacheStoreCommonBehaviorTest#test_fetch_multi_without_expires_in 
[/tmp/autopkgtest-lxc.0k72y7c9/downtmp/build.89X/src/activesupport/test/cache/behaviors/cache_store_behavior.rb:135]:
--- expected
+++ actual
@@ -1 +1 @@
-{"foo"=>"bar", "fu"=>"fufu", "fud"=>"biz"}
+{"foo"=>"foofoo", "fu"=>"fufu", "fud"=>"biz"}



https://ci.debian.net/data/autopkgtest/testing/amd64/r/rails/19565734/log.gz

Failure:
ActiveSupport::Cache::RedisCacheStoreTests::RedisCacheStoreCommonBehaviorTest#test_large_string_with_compress_false 
[/tmp/autopkgtest-lxc.1wz7jlg5/downtmp/build.gWN/src/activesupport/test/cache/behaviors/cache_store_behavior.rb:226]:
--- expected
+++ actual
@@ -1 +1 @@
-"00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+nil
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