See the log:
https://integration.wikimedia.org/ci/job/beta-mediawiki-config-update-eqiad/4456/console
21:03:05 + cd /srv/mediawiki-staging 21:03:05 + pwd 21:03:05 /srv/mediawiki-staging 21:03:05 + git remote update 21:03:05 Fetching origin 21:03:06 From https://gerrit.wikimedia.org/r/p/operations/mediawiki-config 21:03:06 b61215c..2d11e75 master -> origin/master 21:03:06 + git reset --hard 2d11e7534bece3664ac87a3cc1621ea24fb57db6 21:03:06 HEAD is now at 2d11e75 w/static/current symlinks 21:03:06 + git tag jenkins_build_4456 2d11e7534bece3664ac87a3cc1621ea24fb57db6 21:03:06 + git submodule update --init --rebase 21:03:07 First, rewinding head to replay your work on top of it... 21:03:07 Applying: Deploy the A/B/C test search box code to the search-box feature branch, to enable working on top of it 21:03:07 Applying: Display a blue button with a magnifying glass 21:03:07 Applying: Improving cross-browser CSS 21:03:07 Using index info to reconstruct a base tree... 21:03:07 M gulpfile.js 21:03:07 M package.json 21:03:07 M prod/wikipedia.org/index.html 21:03:07 Falling back to patching base and 3-way merge... 21:03:07 Auto-merging prod/wikipedia.org/index.html 21:03:07 Removing prod/wikipedia.org/assets/js/index-992f5860ac.js 21:03:07 Auto-merging package.json 21:03:07 Auto-merging gulpfile.js 21:03:07 CONFLICT (content): Merge conflict in gulpfile.js 21:03:07 Auto-merging dev/wikipedia.org/assets/postcss/style.css 21:03:07 Auto-merging dev/wikipedia.org/assets/postcss/_wm-portal.css 21:03:07 Auto-merging dev/wikipedia.org/assets/postcss/_pab2.css 21:03:07 Auto-merging dev/wikipedia.org/assets/postcss/_pab1.css 21:03:07 Auto-merging dev/wikipedia.org/assets/postcss/_buttons.css 21:03:07 Removing dev/wikipedia.org/assets/cssnext/README.txt 21:03:07 Recorded preimage for 'gulpfile.js' 21:03:07 Failed to merge in the changes. 21:03:07 Patch failed at 0003 Improving cross-browser CSS 21:03:07 The copy of the patch that failed is found in: 21:03:07 /mnt/srv/mediawiki-staging/.git/modules/portals/rebase-apply/patch 21:03:07 21:03:07 When you have resolved this problem, run "git rebase --continue". 21:03:07 If you prefer to skip this patch, run "git rebase --skip" instead. 21:03:07 To check out the original branch and stop rebasing, run "git rebase --abort". 21:03:07 21:03:07 Unable to rebase '2e57bfbd83acce979a25bf213dfd9b44310e3ec2' in submodule path 'portals' 21:03:07 Build step 'Execute shell' marked build as failure