Observing High CPU in EPollArrayWrapper.epollCtl default I/O thread ------------------------------------------------------------------- Key: WFLY-13444 URL: https://issues.redhat.com/browse/WFLY-13444 Project: WildFly Issue Type: Bug Components: Clustering, IO Affects Versions: 10.1.0.Final Reporter: Srinivas ev Assignee: Paul Ferraro Priority: Blocker Attachments: IO thread memory.PNG, IO thread.PNG, Thread consuming high CPU.PNG, ThreadDump1set.zip, ThreadDump2set.zip, stack trace from snapshot.PNG, stack trace in thread dump.PNG, top command output.PNG Facing high CPU by one of the default I/O thread In Wildfly 10.1.0 Final. Looks none of our application component thread is consuming. Can somebody check what is triggering this issue? I attached the thread stack to this Jira. This is blocking our releases. When the CPU cores are high in number, multiple default I/O threads will kick in consuming the CPU in 90~100% range continuously. Wildfly 10.1.0 Final Java - openjdk version "1.8.0_232" OpenJDK Runtime Environment (build 1.8.0_232-b09) OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode --------------------------------------------------------------------------------------------------- at java.lang.Throwable.fillInStackTrace(Native Method) at java.lang.Throwable.fillInStackTrace(Throwable.java:784) at java.lang.Throwable.<init>(Throwable.java:251) at java.lang.Exception.<init>(Exception.java:54) at java.io.IOException.<init>(IOException.java:47) at java.nio.channels.ClosedChannelException.<init>(ClosedChannelException.java:52) at org.xnio.ssl.JsseStreamConduit.write(JsseStreamConduit.java:1022) at org.xnio.conduits.ConduitStreamSinkChannel.write(ConduitStreamSinkChannel.java:150) at org.xnio.http.HttpUpgrade$HttpUpgradeState$StringWriteListener.handleEvent(HttpUpgrade.java:385) at org.xnio.http.HttpUpgrade$HttpUpgradeState$StringWriteListener.handleEvent(HttpUpgrade.java:372) at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) at org.xnio.conduits.WriteReadyHandler$ChannelListenerHandler.writeReady(WriteReadyHandler.java:65) at org.xnio.ssl.JsseStreamConduit.run(JsseStreamConduit.java:393) at org.xnio.ssl.JsseStreamConduit.readReady(JsseStreamConduit.java:547) at org.xnio.ssl.JsseStreamConduit$2.readReady(JsseStreamConduit.java:319) at org.xnio.nio.NioSocketConduit.handleReady(NioSocketConduit.java:89) at org.xnio.nio.WorkerThread.run(WorkerThread.java:567) ------------------------------------------------------------------------------------------- at sun.nio.ch.EPollArrayWrapper.epollCtl(Native Method) at sun.nio.ch.EPollArrayWrapper.updateRegistrations(EPollArrayWrapper.java:299) at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:268) at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93) at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86) at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97) at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:101) at org.xnio.nio.WorkerThread.run(WorkerThread.java:515) -----------------------------------------------------------------------------------