On startup, this happens and Jenkins is inaccessible:

Running from: /usr/share/jenkins/jenkins.war
May 17, 2017 4:19:01 PM Main deleteWinstoneTempContents
WARNING: Failed to delete the temporary Winstone file /tmp/winstone/jenkins.war
May 17, 2017 4:19:01 PM org.eclipse.jetty.util.log.Log initialized
INFO: Logging initialized @305ms to org.eclipse.jetty.util.log.JavaUtilLog
May 17, 2017 4:19:01 PM winstone.Logger logInternal
INFO: Beginning extraction from war file
May 17, 2017 4:19:01 PM org.eclipse.jetty.server.handler.ContextHandler setContextPath
WARNING: Empty contextPath
May 17, 2017 4:19:01 PM org.eclipse.jetty.server.Server doStart
INFO: jetty-9.4.z-SNAPSHOT
May 17, 2017 4:19:01 PM org.eclipse.jetty.webapp.StandardDescriptorProcessor visitServlet
INFO: NO JSP Support for /, did not find org.eclipse.jetty.jsp.JettyJspServlet
May 17, 2017 4:19:01 PM org.eclipse.jetty.server.session.DefaultSessionIdManager doStart
INFO: DefaultSessionIdManager workerName=node0
May 17, 2017 4:19:01 PM org.eclipse.jetty.server.session.DefaultSessionIdManager doStart
INFO: No SessionScavenger set, using defaults
May 17, 2017 4:19:01 PM org.eclipse.jetty.server.session.HouseKeeper startScavenging
INFO: Scavenging every 660000ms
Jenkins home directory: /var/lib/jenkins found at: EnvVars.masterEnvVars.get("JENKINS_HOME")
May 17, 2017 4:19:02 PM org.eclipse.jetty.server.handler.ContextHandler doStart
INFO: Started w.@3e08ff24{/,file:///var/cache/jenkins/war/,AVAILABLE} {/var/cache/jenkins/war}May 17, 2017 4:19:02 PM org.eclipse.jetty.server.AbstractConnector doStart
INFO: Started ServerConnector@4c163e3{HTTP/1.1,[http/1.1]}{::1:8080}
May 17, 2017 4:19:02 PM org.eclipse.jetty.server.Server doStart
INFO: Started @1223ms
May 17, 2017 4:19:02 PM winstone.Logger logInternal
INFO: Winstone Servlet Engine v4.0 running: controlPort=disabled
May 17, 2017 4:19:02 PM jenkins.InitReactorRunner$1 onAttained
INFO: Started initialization
May 17, 2017 4:19:03 PM jenkins.InitReactorRunner$1 onTaskFailed
SEVERE: Failed LogRecorderManager.init
java.lang.Error: java.lang.reflect.InvocationTargetException
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:110)
at hudson.init.TaskMethodFinder$TaskImpl.run(TaskMethodFinder.java:175)
at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
at jenkins.model.Jenkins$7.runTask(Jenkins.java:1088)
at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at hudson.init.TaskMethodFinder.invoke(TaskMethodFinder.java:104)
... 8 more
Caused by: java.lang.StackOverflowError
at java.lang.StringCoding$StringEncoder.encode(StringCoding.java:304)
at java.lang.StringCoding.encode(StringCoding.java:344)
at java.lang.String.getBytes(String.java:918)
at java.io.UnixFileSystem.getBooleanAttributes0(Native Method)
at java.io.UnixFileSystem.getBooleanAttributes(UnixFileSystem.java:242)
at java.io.File.exists(File.java:819)
at sun.misc.URLClassPath$FileLoader.getResource(URLClassPath.java:1282)
at sun.misc.URLClassPath$FileLoader.findResource(URLClassPath.java:1249)
at sun.misc.URLClassPath.findResource(URLClassPath.java:215)
at java.net.URLClassLoader$2.run(URLClassLoader.java:569)
at java.net.URLClassLoader$2.run(URLClassLoader.java:567)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findResource(URLClassLoader.java:566)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:546)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.logging.LogRecorder.orderedTargets(LogRecorder.java:82)
at hudson.logging.LogRecorder$2.publish(LogRecorder.java:108)
at hudson.logging.WeakLogHandler.publish(WeakLogHandler.java:53)
at java.util.logging.Logger.log(Logger.java:738)
at org.eclipse.jetty.util.log.JavaUtilLog.log(JavaUtilLog.java:167)
at org.eclipse.jetty.util.log.JavaUtilLog.debug(JavaUtilLog.java:227)
at org.eclipse.jetty.webapp.WebAppContext.isSystemResource(WebAppContext.java:857)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:548)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.logging.LogRecorder.orderedTargets(LogRecorder.java:82)
at hudson.logging.LogRecorder$2.publish(LogRecorder.java:108)
at hudson.logging.WeakLogHandler.publish(WeakLogHandler.java:53)
at java.util.logging.Logger.log(Logger.java:738)
at org.eclipse.jetty.util.log.JavaUtilLog.log(JavaUtilLog.java:167)
at org.eclipse.jetty.util.log.JavaUtilLog.debug(JavaUtilLog.java:227)
at org.eclipse.jetty.webapp.WebAppContext.isSystemResource(WebAppContext.java:857)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:548)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.logging.LogRecorder.orderedTargets(LogRecorder.java:82)
at hudson.logging.LogRecorder$2.publish(LogRecorder.java:108)
at hudson.logging.WeakLogHandler.publish(WeakLogHandler.java:53)
at java.util.logging.Logger.log(Logger.java:738)
at org.eclipse.jetty.util.log.JavaUtilLog.log(JavaUtilLog.java:167)
at org.eclipse.jetty.util.log.JavaUtilLog.debug(JavaUtilLog.java:227)

(snipped many repetitions of the same)

at org.eclipse.jetty.webapp.WebAppContext.isSystemResource(WebAppContext.java:857)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:548)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.logging.LogRecorder.orderedTargets(LogRecorder.java:82)
at hudson.logging.LogRecorder$2.publish(LogRecorder.java:108)
at hudson.logging.WeakLogHandler.publish(WeakLogHandler.java:53)
at java.util.logging.Logger.log(Logger.java:738)
at org.eclipse.jetty.util.log.JavaUtilLog.log(JavaUtilLog.java:167)
at org.eclipse.jetty.util.log.JavaUtilLog.debug(JavaUtilLog.java:227)
at org.eclipse.jetty.webapp.WebAppContext.isSystemResource(WebAppContext.java:857)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:548)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.logging.LogRecorder.orderedTargets(LogRecorder.java:82)
at hudson.logging.LogRecorder$2.publish(LogRecorder.java:108)
at hudson.logging.WeakLogHandler.publish(WeakLogHandler.java:53)
at java.util.logging.Logger.log(Logger.java:738)
at org.eclipse.jetty.util.log.JavaUtilLog.log(JavaUtilLog.java:167)
at org.eclipse.jetty.util.log.JavaUtilLog.debug(JavaUtilLog.java:227)
at org.eclipse.jetty.webapp.WebAppContext.isSystemResource(WebAppContext.java:857)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:548)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.logging.LogRecorder.orderedTargets(LogRecorder.java:82)
at hudson.logging.LogRecorder$2.publish(LogRecorder.java:108)
at hudson.logging.WeakLogHandler.publish(WeakLogHandler.java:53)
at java.util.logging.Logger.log(Logger.java:738)
at org.eclipse.jetty.util.log.JavaUtilLog.log(JavaUtilLog.java:167)
at org.eclipse.jetty.util.log.JavaUtilLog.debug(JavaUtilLog.java:227)
at org.eclipse.jetty.webapp.WebAppContext.isSystemResource(WebAppContext.java:857)
at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:548)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.logging.LogRecorder.orderedTargets(LogRecorder.java:82)