We have been getting this error for the past day or so. Per instructions at https://wiki.jenkins-ci.org/display/JENKINS/Dead+Executor, am filing a JIRA bug.
May 04, 2016 11:49:24 AM hudson.WebAppMain$3 run INFO: Jenkins is fully up and running May 04, 2016 11:49:33 AM javax.jmdns.impl.DNSStatefulObject$DefaultImplementation waitForAnnounced WARNING: Wait for announced timed out: DNS: JSERVER07.local. state: announcing 1 task: Announcer(JSERVER07.local.) state: announcing 1 May 04, 2016 11:49:39 AM javax.jmdns.impl.DNSStatefulObject$DefaultImplementation waitForAnnounced WARNING: Wait for announced timed out: DNS: JSERVER07.local. state: probing 1 task: Prober(JSERVER07.local.) state: probing 1 May 04, 2016 11:49:45 AM javax.jmdns.impl.DNSStatefulObject$DefaultImplementation waitForAnnounced WARNING: Wait for announced timed out: DNS: JSERVER07.local. state: probing 1 task: Prober(JSERVER07.local.) state: probing 1 May 04, 2016 11:51:07 AM hudson.model.Executor run SEVERE: Unexpected executor death java.lang.IllegalStateException: /var/lib/jenkins/builds/my_project/2 already existed; will not overwrite with my_project #2 at hudson.model.RunMap.put(RunMap.java:188) at jenkins.model.lazy.LazyBuildMixIn.newBuild(LazyBuildMixIn.java:176) at hudson.model.AbstractProject.newBuild(AbstractProject.java:1019) at hudson.model.AbstractProject.createExecutable(AbstractProject.java:1210) at hudson.model.AbstractProject.createExecutable(AbstractProject.java:145) at hudson.model.Executor$1.call(Executor.java:364) at hudson.model.Executor$1.call(Executor.java:346) at hudson.model.Queue._withLock(Queue.java:1405) at hudson.model.Queue.withLock(Queue.java:1270) at hudson.model.Executor.run(Executor.java:346)
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