Bug#976997: haproxy: flaky ppc64el autopkgtest on ci.debian.net: 503 Service Unavailable

[Paul Gevers]

Source: mpi4py
Version: 3.0.3-7
Severity: serious
Tags: sid bullseye
X-Debbugs-CC: debian-ci at lists.debian.org
User: debian-ci at lists.debian.org
Usertags: flaky

Dear maintainer(s),

The autopkgtest of your package turned up as blocking gcc-10. I looked
into the history of your autopkgtest and it fails regularly on ppc64el
[1]. I copied the output at the bottom of this report. I noticed that
all the failures in testing were the same and all ran on our
ci-worker-ppc64el-01. This worker is a bit slower than the rest, so I
suspect your test (or code) just fails to wait for the service to come
up properly. All the successful runs that I checked were on other workers.

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.

Please do get in touch if we need to dive into this together. Or if you
want to discuss this issue.

Paul

[1] https://ci.debian.net/packages/h/haproxy/testing/ppc64el/
https://ci.debian.net/data/autopkgtest/testing/ppc64el/h/haproxy/8726704/log.gz

autopkgtest [18:08:36]: test proxy-localhost: [-----------------------
+ cat
+ service haproxy restart
+ wget -t1 http://localhost:8080+ cmp /var/www/html/index.html -
 -O-
--2020-12-08 18:09:02--  http://localhost:8080/
Resolving localhost (localhost)... ::1, 127.0.0.1
Connecting to localhost (localhost)|::1|:8080... failed: Connection refused.
Connecting to localhost (localhost)|127.0.0.1|:8080... connected.
HTTP request sent, awaiting response... 503 Service Unavailable
2020-12-08 18:09:05 ERROR 503: Service Unavailable.

cmp: EOF on - which is empty
+ echo FAIL: downloaded index.html via haproxy is different from the
+ echo       file delivered by apache.
+ exit 1
FAIL: downloaded index.html via haproxy is different from the
      file delivered by apache.

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