On https://gerrit.wikimedia.org/r/#/c/396035/ was a test failure:
16:11:15 [36bb8fdc9ce8570097596763] [no req] MWException from line 167 of /home/jenkins/workspace/mediawiki-extensions-hhvm-jessie/src/includes/Hooks.php: Invalid callback Wikibase\RepoHooks::onSetupAfterCache in hooks for SetupAfterCache 16:11:15 16:11:15 Backtrace: 16:11:15 #0 /home/jenkins/workspace/mediawiki-extensions-hhvm-jessie/src/includes/Hooks.php(205): Hooks::callHook(string, array, array, NULL) 16:11:15 #1 /home/jenkins/workspace/mediawiki-extensions-hhvm-jessie/src/includes/Setup.php(710): Hooks::run(string) 16:11:15 #2 /home/jenkins/workspace/mediawiki-extensions-hhvm-jessie/src/maintenance/doMaintenance.php(79): include(string) 16:11:15 #3 /home/jenkins/workspace/mediawiki-extensions-hhvm-jessie/src/tests/phpunit/phpunit.php(172): include(string) 16:11:15 #4 {main}
Possible https://gerrit.wikimedia.org/r/#/c/395704/ (as mention in the comments)
I would say it is not possible to stay with this situation.