[JIRA] [master-slave] (JENKINS-5413) SCM polling getting hung

Tue, 08 Apr 2014 19:43:15 -0700

 
Dmitry Maslakov edited a comment on Bug JENKINS-5413

Just got this error after upgrade from 1.556 to 1.558.

Using suggested scripts to kill hung threads did not help, they start again and hung.

Using VisualVM I get the dump of threads and here is the one which hunged for more than 8 hours:

"SCM polling for hudson.maven.MavenModuleSet@4f6ded0d[project-name]" - Thread t@357
   java.lang.Thread.State: WAITING
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for <28ff58dd> (a java.util.concurrent.FutureTask)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:425)
	at java.util.concurrent.FutureTask.get(FutureTask.java:187)
	at hudson.remoting.Request.call(Request.java:157)
	- locked <2de9b3db> (a hudson.remoting.UserRequest)
	at hudson.remoting.Channel.call(Channel.java:722)
	at hudson.scm.SubversionSCM.compareRemoteRevisionWith(SubversionSCM.java:1451)
	at hudson.scm.SCM._compareRemoteRevisionWith(SCM.java:356)
	at hudson.scm.SCM.poll(SCM.java:373)
	at hudson.model.AbstractProject._poll(AbstractProject.java:1490)
	at hudson.model.AbstractProject.poll(AbstractProject.java:1399)
	at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:462)
	at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:491)
	at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	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:744)

   Locked ownable synchronizers:
	- locked <70cbc89f> (a java.util.concurrent.ThreadPoolExecutor$Worker)

The project the SCM is polling is a maven project. Maven plug-in was also upgraded (probably this is a culprit) from 2.1 to 2.2.
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