Functional tests against 1.509.4 seem to consistently print
Dec 12, 2013 11:46:49 AM jenkins.InitReactorRunner$1 onAttained INFO: Prepared all plugins Dec 12, 2013 11:46:50 AM net.java.sezpoz.Index$LazyIndexIterator peek WARNING: possible endless loop getting index for interface hudson.Extension from classLoader hudson.PluginManager$UberClassLoader Dec 12, 2013 11:46:50 AM net.java.sezpoz.Index$LazyIndexIterator peek WARNING: possible endless loop getting index for interface hudson.Extension from classLoader hudson.PluginManager$UberClassLoader Dec 12, 2013 11:46:51 AM net.java.sezpoz.Index$LazyIndexIterator peek WARNING: possible endless loop getting index for interface hudson.Extension from classLoader hudson.PluginManager$UberClassLoader Dec 12, 2013 11:46:52 AM jenkins.InitReactorRunner$1 onAttained INFO: Started all plugins
Seems to take some time going into a 1000-deep loop. Probably some bug in the Guice integration. Not fatal but ugly and slows down tests.
Do not recall seeing this recently.