https://gerrit.wikimedia.org/r/#/c/269169/ failed to merge with the following error at the end of the `mediawiki-extensions-php55` job:
```
00:39:04 [mediawiki-extensions-php55] $ /bin/bash -xe /tmp/hudson4352663662233031134.sh
00:39:04 + /srv/deployment/integration/slave-scripts/bin/mw-teardown-mysql.sh
00:39:04 ERROR 1269 (HY000) at line 1: Can't revoke all privileges for one or more of the requested users
00:39:05 Build step 'Execute a set of scripts' changed build result to FAILURE
00:39:05 Build step 'Execute a set of scripts' marked build as failure
00:39:05 Archiving artifacts
00:39:05 Finished: FAILURE
```
For full details, see https://integration.wikimedia.org/ci/job/mediawiki-extensions-php55/599/console
Probably unrelatedly, there are also warnings in the middle of the unit tests:
```
00:28:08 Populating links tables...
00:28:09 Completed
00:28:09 Updated 0 workflows
00:28:09 Failed: 0
00:28:09
00:28:09 Array
00:28:09 (
00:28:09 )
00:28:09 PHP Notice: Cannot find site jenkins_u0_mw in sites table [Called from Wikibase\Client\WikibaseClient::newSiteGroup in /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php at line 591] in /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/debug/MWDebug.php on line 300
00:28:09 PHP Stack trace:
00:28:09 PHP 1. {main}() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/update.php:0
00:28:09 PHP 2. require_once() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/update.php:214
00:28:09 PHP 3. UpdateMediaWiki->execute() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/doMaintenance.php:103
00:28:09 PHP 4. LoggedUpdateMaintenance->execute() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/update.php:181
00:28:09 PHP 5. FlowCreateTemplates->doDBUpdates() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/Maintenance.php:1438
00:28:09 PHP 6. FlowCreateTemplates->create() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Flow/maintenance/FlowCreateTemplates.php:84
00:28:09 PHP 7. WikiPage->doEditContent() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Flow/maintenance/FlowCreateTemplates.php:113
00:28:09 PHP 8. WikiPage->prepareContentForEdit() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/page/WikiPage.php:1710
00:28:09 PHP 9. AbstractContent->getParserOutput() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/page/WikiPage.php:2172
00:28:09 PHP 10. Hooks::run() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/content/AbstractContent.php:501
00:28:09 PHP 11. call_user_func_array() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/Hooks.php:195
00:28:09 PHP 12. Wikibase\Client\Hooks\ParserOutputUpdateHookHandlers::onContentAlterParserOutput() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/Hooks.php:195
00:28:09 PHP 13. Wikibase\Client\Hooks\ParserOutputUpdateHookHandlers::newFromGlobalState() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/Hooks/ParserOutputUpdateHookHandlers.php:87
00:28:09 PHP 14. Wikibase\Client\WikibaseClient->getLangLinkHandler() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/Hooks/ParserOutputUpdateHookHandlers.php:66
00:28:09 PHP 15. Wikibase\Client\WikibaseClient->getLangLinkSiteGroup() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:704
00:28:09 PHP 16. Wikibase\Client\WikibaseClient->getSiteGroup() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:570
00:28:09 PHP 17. Wikibase\Client\WikibaseClient->newSiteGroup() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:609
00:28:09 PHP 18. wfWarn() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:591
00:28:09 PHP 19. MWDebug::warning() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/GlobalFunctions.php:1181
00:28:09 PHP 20. MWDebug::sendMessage() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/debug/MWDebug.php:155
00:28:09 PHP 21. trigger_error() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/debug/MWDebug.php:300
00:28:09
00:28:09 Notice: Cannot find site jenkins_u0_mw in sites table [Called from Wikibase\Client\WikibaseClient::newSiteGroup in /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php at line 591] in /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/debug/MWDebug.php on line 300
00:28:09
00:28:09 Call Stack:
00:28:09 0.0006 275400 1. {main}() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/update.php:0
00:28:09 0.0036 634296 2. require_once('/mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/doMaintenance.php') /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/update.php:214
00:28:09 0.3272 19210824 3. UpdateMediaWiki->execute() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/doMaintenance.php:103
00:28:09 2.2897 38129000 4. LoggedUpdateMaintenance->execute() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/update.php:181
00:28:09 2.2911 38129448 5. FlowCreateTemplates->doDBUpdates() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/maintenance/Maintenance.php:1438
00:28:09 2.2965 38520816 6. FlowCreateTemplates->create() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Flow/maintenance/FlowCreateTemplates.php:84
00:28:09 2.3424 40019200 7. WikiPage->doEditContent() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Flow/maintenance/FlowCreateTemplates.php:113
00:28:09 2.3489 40293360 8. WikiPage->prepareContentForEdit() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/page/WikiPage.php:1710
00:28:09 2.4773 45720160 9. AbstractContent->getParserOutput() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/page/WikiPage.php:2172
00:28:09 2.5731 47579664 10. Hooks::run() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/content/AbstractContent.php:501
00:28:09 2.5735 47607312 11. call_user_func_array() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/Hooks.php:195
00:28:09 2.5735 47607888 12. Wikibase\Client\Hooks\ParserOutputUpdateHookHandlers::onContentAlterParserOutput() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/Hooks.php:195
00:28:09 2.5735 47608080 13. Wikibase\Client\Hooks\ParserOutputUpdateHookHandlers::newFromGlobalState() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/Hooks/ParserOutputUpdateHookHandlers.php:87
00:28:09 2.5740 47649336 14. Wikibase\Client\WikibaseClient->getLangLinkHandler() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/Hooks/ParserOutputUpdateHookHandlers.php:66
00:28:09 2.5825 47998984 15. Wikibase\Client\WikibaseClient->getLangLinkSiteGroup() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:704
00:28:09 2.5825 47999072 16. Wikibase\Client\WikibaseClient->getSiteGroup() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:570
00:28:09 2.5825 47999216 17. Wikibase\Client\WikibaseClient->newSiteGroup() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:609
00:28:09 2.5880 48171536 18. wfWarn() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/extensions/Wikidata/extensions/Wikibase/client/includes/WikibaseClient.php:591
00:28:09 2.5886 48171816 19. MWDebug::warning() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/GlobalFunctions.php:1181
00:28:09 2.5893 48173800 20. MWDebug::sendMessage() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/debug/MWDebug.php:155
00:28:09 2.5893 48174176 21. trigger_error() /mnt/jenkins-workspace/workspace/mediawiki-extensions-php55/src/includes/debug/MWDebug.php:300
00:28:09
00:28:10 Removed 0 links to special pages.
00:28:10 Completed
00:28:10 Completed
```