Issue
A thread is stuck looking up for an IPv6 hostname with a stack like:
pool-1-thread-5446 for channel id=12367 (0x304f) state=RUNNABLE cpu=100% (running in native)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(Unknown Source)
at java.net.InetAddress.getAddressesFromNameService(Unknown Source)
at java.net.InetAddress.getLocalHost(Unknown Source)
at net.bull.javamelody.Parameters.getHostName(Parameters.java:239)
at net.bull.javamelody.JavaInformations.<init>(JavaInformations.java:147)
at net.bull.javamelody.RemoteCallHelper$1.call(RemoteCallHelper.java:46)
at net.bull.javamelody.RemoteCallHelper$1.call(RemoteCallHelper.java:38)
at net.bull.javamelody.RemoteCallHelper$DelegatingTask.call(RemoteCallHelper.java:132)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:328)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at hudson.remoting.Engine$1$1.run(Engine.java:63)
at java.lang.Thread.run(Unknown Source)
Environment
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CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
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CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
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CloudBees CI (CloudBees Core) on traditional platforms - Client controller
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CloudBees CI (CloudBees Core) on traditional platforms - Operations Center
Resolution
If IPv6 is available on the OS you are using, then Jenkins will try to communicate using IPv6.
You can force Jenkins to use IPv4 by adding -Djava.net.preferIPv4Stack=true (refer to How to add Java arguments to Jenkins?).
This article is part of our Knowledge Base and is provided for guidance-based purposes only. The solutions or workarounds described here are not officially supported by CloudBees and may not be applicable in all environments. Use at your own discretion, and test changes in a safe environment before applying them to production systems.