I just updated to master (d56012ce262b76dfd033d8c8ee87c77d02684807), with proper stop of php-fpm, bin/storage upgrade, etc.
In my web server, when accessing config/issues/, I'm getting the following traceback:
2015/04/13 17:49:39 [error] 20683#0: *11936 FastCGI sent in stderr: "PHP message: [2015-04-13 17:49:39] ERROR 8: Undefined index: info at [/var/lib/phabricator/phabricator/src/applications/cache/spec/PhabricatorDataCacheSpec.php:86]
PHP message: arcanist(head=master, ref.master=b11757fa23a5), phabricator(head=master, ref.master=d56012ce262b), phutil(head=master, ref.master=efc338d50f17), sprint(head=master, ref.master=e04d2f17979a)
PHP message: #0 PhabricatorDataCacheSpec::initAPCCommonSpec() called at [<phabricator>/src/applications/cache/spec/PhabricatorDataCacheSpec.php:52]
PHP message: #1 PhabricatorDataCacheSpec::initAPCuSpec() called at [<phabricator>/src/applications/cache/spec/PhabricatorDataCacheSpec.php:23]
PHP message: #2 PhabricatorDataCacheSpec::getActiveCacheSpec() called at [<phabricator>/src/applications/config/check/PhabricatorCacheSetupCheck.php:11]
PHP message: #3 PhabricatorCacheSetupCheck::executeChecks() called at [<phabricator>/src/applications/config/check/PhabricatorSetupCheck.php:45]
PHP message: #4 PhabricatorSetupCheck::runSetupChecks() called at [<phabricator>/src/applications/config/check/PhabricatorSetupCheck.php:129]
PHP message: #5 PhabricatorSetupCheck::runAllChecks() called at [<phabricator>/src/applications/config/controller/PhabricatorConfigIssueListController.php:13]
PHP message: #6 PhabricatorConfigIssueListController::processRequest() called at [<phabricator>/src/aphront/AphrontController.php:33]
PHP message: #7 AphrontController::handleRequest(AphrontRequest) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:196]
PHP message: #8 AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:121]
PHP message: #9 AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phabricator>/webroot/index.php:19]
It's not clear to me that there is an actual problem, but I figured reporting the traceback is a good idea. :-)