Several times a day I encounter executor death with stacktrace like this:

{{Unexpected executor death
java.lang.IllegalStateException: /XXXXXXXXXXXX/jenkins_workdir/jobs/XXXXX-1.2.x (continuous integration)/builds/214 already existed; will not overwite with XXXXX-1.2.x (continuous integration) #214
at hudson.model.RunMap.put(RunMap.java:189)
at jenkins.model.lazy.LazyBuildMixIn.newBuild(LazyBuildMixIn.java:178)
at hudson.model.AbstractProject.newBuild(AbstractProject.java:1017)
at hudson.model.AbstractProject.createExecutable(AbstractProject.java:1216)
at hudson.model.AbstractProject.createExecutable(AbstractProject.java:144)
at hudson.model.Executor$1.call(Executor.java:335)
at hudson.model.Executor$1.call(Executor.java:317)
at hudson.model.Queue._withLock(Queue.java:1345)
at hudson.model.Queue.withLock(Queue.java:1210)
at hudson.model.Executor.run(Executor.java:317)}}