[JENKINS-25897] Infinite loop with crontab "H H(19-24) * * *" #23651

Bug similar to JENKINS-12356 and JENKINS-12357.

Problem: setting "Build periodically" on schedule H H(19-24) * * * triggers infinite loop. There are multiple threads taking all available CPU resources.

http://localhost:8080/threadDump shows traces like this:

"Handling GET /view/q/job/t/descriptorByName/hudson.triggers.TimerTrigger/checkSpec : RequestHandlerThread[#11]" Id=128 Group=main RUNNABLE
	at java.util.GregorianCalendar.computeTime(GregorianCalendar.java:2592)
	at java.util.Calendar.updateTime(Calendar.java:2606)
	at java.util.Calendar.complete(Calendar.java:1558)
	at java.util.GregorianCalendar.add(GregorianCalendar.java:891)
	at hudson.scheduler.CronTab$CalendarField.addTo(CronTab.java:169)
	at hudson.scheduler.CronTab.floor(CronTab.java:367)
	at hudson.scheduler.CronTabList.previous(CronTabList.java:99)
	at hudson.triggers.TimerTrigger$DescriptorImpl.doCheckSpec(TimerTrigger.java:81)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)
	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:121)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:648)
	at org.kohsuke.stapler.Stapler.service(Stapler.java:237)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96)
	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:370)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:949)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1011)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
	at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)

	Number of locked synchronizers = 1
	- java.util.concurrent.ThreadPoolExecutor$Worker@​79fa1df7

The issue has been identified in production with 1.580.1 and 1.565.3. The following setup was enough to reproduce the problem:

• Jenkins: 1.580.1
• Cron Column Plugin 1.4 (not confirmed if relevant)
• java -version

   
  java version "1.7.0_65"
  OpenJDK Runtime Environment (IcedTea 2.5.3) (7u71-2.5.3-0ubuntu1)
  OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)
  
  ```</li>
  	<li>running on Ubuntu 14.10</li>
  </ul>
  
  
  <p>Entering of this specific schedule was not enough to trigger the bug.  A few editing attempts, especially changing "24" to 23 and back could trigger this infinite loop.</p>
  
  <p>In production jenkins the job with this particular schedule was not triggered at the specified hour.</p>
  
  <p>In case someone needs it: workaround for not restarting the master was to .stop() offending threads using Groovy console.</p>
  
  ---
  <details><summary><i>Originally reported by <a href="https://issues.jenkins.io/secure/ViewProfile.jspa?name=ortylp">ortylp</a>, imported from: <a class="no-jira-link-rewrite" href="https://issues.jenkins.io/browse/JENKINS-25897" target="_blank">Infinite loop with crontab "H H(19-24) * * *"</a></i></summary>
  <i><ul>
  <li><b>assignee</b>: <img align="left" width="20" src="https://raw.githubusercontent.com/jenkinsci/artifacts-from-jira-issues/refs/heads/main/avatars/danielbeck.png" title="danielbeck's avatar" /> <a href="https://issues.jenkins.io/secure/ViewProfile.jspa?name=danielbeck">danielbeck</a>
  <li><b>status</b>: Resolved
  <li><b>priority</b>: Major
  <li><b>component(s)</b>: core
  <li><b>label(s)</b>: 1.596.2-fixed
  <li><b>resolution</b>: Fixed
  <li><b>resolved</b>: 2014-12-23T13:43:53+00:00
  <li><b>votes</b>: 1
  <li><b>watchers</b>: 4
  <li><b>imported</b>: 2025-11-24
  </ul></i>
  <details><summary>Raw content of original issue</summary>
  
  <pre>
  <p>Bug similar to <a href="https://issues.jenkins.io/browse/JENKINS-12356" title="Infinite loop with crontab &quot;0 0 1 0 0&quot;" class="issue-link" data-issue-key="JENKINS-12356"><del>JENKINS-12356</del></a> and <a href="https://issues.jenkins.io/browse/JENKINS-12357" title="Infinite loop or invalid next execution with crontab DoW=7" class="issue-link" data-issue-key="JENKINS-12357"><del>JENKINS-12357</del></a>.</p>
  
  <p>Problem: setting "Build periodically" on schedule H H(19-24) * * * triggers infinite loop.  There are multiple threads taking all available CPU resources.</p>
  
  <p><a href="http://localhost:8080/threadDump" class="external-link" target="_blank" rel="nofollow noopener">http://localhost:8080/threadDump</a> shows traces like this:</p>
  <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent">
  <pre>"Handling GET /view/q/job/t/descriptorByName/hudson.triggers.TimerTrigger/checkSpec : RequestHandlerThread[#11]" Id=128 Group=main RUNNABLE
  	at java.util.GregorianCalendar.computeTime(GregorianCalendar.java:2592)
  	at java.util.Calendar.updateTime(Calendar.java:2606)
  	at java.util.Calendar.complete(Calendar.java:1558)
  	at java.util.GregorianCalendar.add(GregorianCalendar.java:891)
  	at hudson.scheduler.CronTab$CalendarField.addTo(CronTab.java:169)
  	at hudson.scheduler.CronTab.floor(CronTab.java:367)
  	at hudson.scheduler.CronTabList.previous(CronTabList.java:99)
  	at hudson.triggers.TimerTrigger$DescriptorImpl.doCheckSpec(TimerTrigger.java:81)
  	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  	at java.lang.reflect.Method.invoke(Method.java:606)
  	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)
  	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
  	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
  	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:121)
  	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
  	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
  	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
  	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
  	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
  	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
  	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
  	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
  	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
  	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
  	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
  	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
  	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
  	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:745)
  	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:875)
  	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:648)
  	at org.kohsuke.stapler.Stapler.service(Stapler.java:237)
  	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
  	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
  	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
  	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96)
  	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88)
  	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
  	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
  	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
  	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
  	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
  	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
  	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
  	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46)
  	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
  	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
  	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
  	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
  	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
  	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
  	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
  	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
  	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
  	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
  	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
  	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
  	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
  	at org.eclipse.jetty.server.Server.handle(Server.java:370)
  	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
  	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:949)
  	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1011)
  	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
  	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
  	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
  	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
  	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
  	at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
  	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
  	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
  	at java.lang.Thread.run(Thread.java:745)
  
  	Number of locked synchronizers = 1
  	- java.util.concurrent.ThreadPoolExecutor$Worker@79fa1df7
  
  </pre>
  </div></div>
  
  
  <p>The issue has been identified in production with 1.580.1 and 1.565.3. The following setup was enough to reproduce the problem:</p>
  <ul>
  	<li>Jenkins: 1.580.1</li>
  	<li>Cron Column Plugin 1.4 (not confirmed if relevant)</li>
  	<li>java -version
  <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent">
  <pre> 
  java version "1.7.0_65"
  OpenJDK Runtime Environment (IcedTea 2.5.3) (7u71-2.5.3-0ubuntu1)
  OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)
  </pre>
  </div></div></li>
  	<li>running on Ubuntu 14.10</li>
  </ul>
  
  
  <p>Entering of this specific schedule was not enough to trigger the bug.  A few editing attempts, especially changing "24" to 23 and back could trigger this infinite loop.</p>
  
  <p>In production jenkins the job with this particular schedule was not triggered at the specified hour.</p>
  
  <p>In case someone needs it: workaround for not restarting the master was to .stop() offending threads using Groovy console.</p></pre>
  </details>
  </details>