I recently upgraded Jenkins to 1.447 and enabled the hudson.upstreamCulprits setting. When my Maven2/3 job runs, it completes normally from the console perspective, but on the main build page, the executors show that it is still running. I used the monitoring plugin to inspect the threads and found that it seems to be trying to figure out which logs to keep. This process seems to run for about 20 minutes. I am guessing this may have something to do with the number of builds. Here's a sample stack trace of the executor:

Executor #0 for master : executing aat-tao-3.8 #805
java.util.ArrayList.size(ArrayList.java:177)
java.util.AbstractList$Itr.hasNext(AbstractList.java:339)
hudson.maven.MavenModuleSetBuild.getDownstreamRelationship(MavenModuleSetBuild.java:489)
hudson.model.AbstractBuild.getWhyKeepLog(AbstractBuild.java:986)
hudson.maven.MavenBuild.getWhyKeepLog(MavenBuild.java:264)
hudson.model.Run.isKeepLog(Run.java:470)
hudson.tasks.LogRotator.perform(LogRotator.java:140)
hudson.model.Job.logRotate(Job.java:326)
hudson.maven.MavenModuleSet.logRotate(MavenModuleSet.java:712)
hudson.model.Run.run(Run.java:1469)
hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:481)
hudson.model.ResourceController.execute(ResourceController.java:88)
hudson.model.Executor.run(Executor.java:238)