During the main mediawiki-extensions-hhvm run, all 13 of 13 exceptions logged on every build are from Flow. They are all instances of the same exception.
Sample:
2015-06-04 12:09:13 integration-slave-trusty-1017 jenkins_u1_mw-unittest_: [e3e0b8d2] [no req] Flow\Exception\FlowException from line 173 of /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/Formatter/RevisionFormatter.php: Formatting for wrong user #0 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/Formatter/TopicFormatter.php(45): Flow\Formatter\RevisionFormatter->formatApi() #1 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/Block/Topic.php(635): Flow\Formatter\TopicFormatter->formatApi() #2 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/Block/Topic.php(547): Flow\Block\TopicBlock->renderTopicApi() #3 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/View.php(177): Flow\Block\TopicBlock->renderApi() #4 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/View.php(70): Flow\View->buildApiResponse() #5 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/Content/BoardContent.php(192): Flow\View->show() #6 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/includes/page/WikiPage.php(2119): Flow\Content\BoardContent->getParserOutput() #7 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/includes/page/WikiPage.php(1760): WikiPage->prepareContentForEdit() #8 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/TalkpageManager.php(159): WikiPage->doEditContent() #9 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/Data/Listener/OccupationListener.php(76): Flow\TalkpageManager->ensureFlowRevision() #10 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/includes/deferred/CallableUpdate.php(27): {closure}() #11 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/includes/deferred/DeferredUpdates.php(119): MWCallableUpdate->doUpdate() #12 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/includes/deferred/DeferredUpdates.php(76): DeferredUpdates::doUpdates() #13 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/includes/deferred/DeferredUpdates.php(99): DeferredUpdates::addUpdate() #14 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/SubmissionHandler.php(160): DeferredUpdates::addCallableUpdate() #15 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/WorkflowLoader.php(66): Flow\SubmissionHandler->commit() #16 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/Api/ApiFlowBasePost.php(41): Flow\WorkflowLoader->commit() #17 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/includes/Api/ApiFlow.php(92): Flow\Api\ApiFlowBasePost->execute() #18 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/includes/api/ApiMain.php(1098): Flow\Api\ApiFlow->execute() #19 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/includes/api/ApiMain.php(407): ApiMain->executeAction() #20 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/tests/phpunit/includes/api/ApiTestCase.php(115): ApiMain->execute() #21 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/tests/phpunit/api/ApiTestCase.php(69): ApiTestCase->doApiRequest() #22 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/tests/phpunit/api/ApiTestCase.php(83): Flow\Tests\Api\ApiTestCase->doApiRequest() #23 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/extensions/Flow/tests/phpunit/api/ApiFlowEditTopicSummaryTest.php(15): Flow\Tests\Api\ApiTestCase->createTopic() #24 (): Flow\Tests\Api\ApiFlowEditTopicSummaryTest->testEditTopicSummary() #25 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php(988): ReflectionMethod->invokeArgs() #26 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php(838): PHPUnit_Framework_TestCase->runTest() #27 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestResult.php(648): PHPUnit_Framework_TestCase->runBare() #28 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestCase.php(783): PHPUnit_Framework_TestResult->run() #29 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/tests/phpunit/MediaWikiTestCase.php(131): PHPUnit_Framework_TestCase->run() #30 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php(779): MediaWikiTestCase->run() #31 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php(749): PHPUnit_Framework_TestSuite->runTest() #32 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php(709): PHPUnit_Framework_TestSuite->run() #33 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php(709): PHPUnit_Framework_TestSuite->run() #34 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/Framework/TestSuite.php(709): PHPUnit_Framework_TestSuite->run() #35 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/TextUI/TestRunner.php(350): PHPUnit_Framework_TestSuite->run() #36 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/TextUI/Command.php(176): PHPUnit_TextUI_TestRunner->doRun() #37 /srv/deployment/integration/phpunit/vendor/phpunit/phpunit/PHPUnit/TextUI/Command.php(129): PHPUnit_TextUI_Command->run() #38 /mnt/jenkins-workspace/workspace/mediawiki-extensions-hhvm@2/src/tests/phpunit/phpunit.php(241): PHPUnit_TextUI_Command::main() #39 {main}
This is blocking us from enabling strict mode in Jenkins phpunit builds that assert no warnings/exceptions occur during the test suite.