https://bugzilla.wikimedia.org/show_bug.cgi?id=60106

       Web browser: ---
            Bug ID: 60106
           Summary: Jenkins triggering false failures occasionally on
                    parsoid patches
           Product: Wikimedia
           Version: wmf-deployment
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Continuous integration
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: ssas...@wikimedia.org
                CC: canan...@wikimedia.org, gwi...@wikimedia.org,
                    has...@free.fr, innocentkil...@gmail.com,
                    krinklem...@gmail.com
    Classification: Unclassified
   Mobile Platform: ---

In recent days, we've often run into this issue where a patch passes parser
tests after submit, but fails after +2 in the gate-and-submit pipeline.

* https://gerrit.wikimedia.org/r/#/c/106284/
* https://gerrit.wikimedia.org/r/#/c/107600/
* https://gerrit.wikimedia.org/r/#/c/107605

Looking at jenkins full console log for one the failing run for gerrit patch
106284 above
(https://integration.wikimedia.org/ci/job/parsoidsvc-parsertests-run-harder/211/consoleFull),
we see this:
-----------
17:59:40 + git checkout FETCH_HEAD
17:59:40 Warning: you are leaving 45 commits behind, not connected to
17:59:40 any of your branches:
-----------

That looks quite odd ... why would we be leaving behind 45 commits? That
indicates a bad checkout somehow.

Look at full console log for a failing run for gerrit patch 107600
(https://integration.wikimedia.org/ci/job/parsoidsvc-parsertests-run-harder/286/consoleFull),
we see this:
------------
19:46:07 + git checkout FETCH_HEAD
19:46:07 Warning: you are leaving 2 commits behind, not connected to
19:46:07 any of your branches:
------------

But, Looking at jenks full console log for the final passing run for gerrit
patch 107600
(https://integration.wikimedia.org/ci/job/parsoidsvc-parsertests-run-harder/288/consoleFull),
we see this:

----------- 
19:51:12 + git checkout FETCH_HEAD
19:51:12 Warning: you are leaving 1 commit behind, not connected to
19:51:12 any of your branches:
-----------

This looks more reasonable.

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