PermGen errors on master and slave

[Mike Emett]

We recently updated our Jenkins master from 1.536 to 2.5 and we are now experiencing an intermittent recurring issue with PermGen errors that we did not have prior to the update. 

Occasionally one of our slaves (though not necessarily the same slave each time) will get the following error immediately after starting a build; 

13:53:01 Building remotely on slavemach (linux) in workspace /home/Mike/workspace/MadiToNet 
13:53:01 java.io.IOException: remote file operation failed: /home/Mike/workspace/MadiToNet at hudson.remoting.Channel@6e2f66:slavemach: java.io.IOException: Remote call on slavemach failed 
13:53:01 at hudson.FilePath.act(FilePath.java:1014) 
13:53:01 at hudson.FilePath.act(FilePath.java:996) 
13:53:01 at hudson.scm.SubversionSCM.checkout(SubversionSCM.java:894) 
13:53:01 at hudson.scm.SubversionSCM.checkout(SubversionSCM.java:830) 
13:53:01 at hudson.scm.SCM.checkout(SCM.java:485) 
13:53:01 at hudson.model.AbstractProject.checkout(AbstractProject.java:1269) 
13:53:01 at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:604) 
13:53:01 at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86) 
13:53:01 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:529) 
13:53:01 at hudson.model.Run.execute(Run.java:1741) 
13:53:01 at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) 
13:53:01 at hudson.model.ResourceController.execute(ResourceController.java:98) 
13:53:01 at hudson.model.Executor.run(Executor.java:410) 
13:53:01 Caused by: java.io.IOException: Remote call on slavemach failed 
13:53:01 at hudson.remoting.Channel.call(Channel.java:789) 
13:53:01 at hudson.FilePath.act(FilePath.java:1007) 
13:53:01 ... 12 more 
13:53:01 Caused by: java.lang.OutOfMemoryError: PermGen space 

... and so on

A cmd->java -version reports that the slave is running jdk 1.8.0_91, which it seems doesn't support PermGen at all. 

After restarting the slave machine (on a whim) our next build processed successfully until the very end, whereupon we recieved; 

14:38:49 FATAL: java.io.IOException: Unexpected reader termination 
14:38:50 FATAL: PermGen space 
14:38:50 Finished: null 

Interestingly, after restarting the master machine the issue has gone away for the time being. Is it the case that a PermGen error on the master can cause just one of several slaves to fail in this way? It seems that the master is using jdk 1.7.0_25, but as it isn't directly involved in the builds itself I had assumed that this would be ok? 

Any help will be greatly appreciated, 

Mike 

[Baptiste Mathus]

In general, it's recommended to run the same JVM version on the master and the agents, mostly due to how remoting works I think (Oleg will correct me if wrong).

And yes. PermGen was removed from the Java VM starting at Jdk 8.

Cheers

Red Lion 49 Ltd T/A Solid State Logic

Registered as a limited company in England and Wales (Company No:5362730) Registered Office: 25 Spring Hill Road, Begbroke, Oxford OX5 1RU, United Kingdom

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[mikeeSSL]

Thanks, I have upgraded the master and that seems to have done the trick.



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