OutOfMemory DirectByteBuffer XNIO --------------------------------- Key: WFLY-4696 URL: https://issues.jboss.org/browse/WFLY-4696 Project: WildFly Issue Type: Bug Components: IO, Web (Undertow) Affects Versions: 8.1.0.Final, 8.2.0.Final Reporter: Carlos Rodríguez Aguado Assignee: Stuart Douglas Priority: Blocker I get this errors constantly in my server when a web connection is interrupted from the browser for instance: 11:50:45,301 ERROR [stderr] (default task-339) Exception in thread "default task-339" java.nio.BufferOverflowException 11:50:45,301 ERROR [stderr] (default task-339) at java.nio.DirectByteBuffer.put(DirectByteBuffer.java:363) 11:50:45,301 ERROR [stderr] (default task-339) at java.nio.ByteBuffer.put(ByteBuffer.java:859) 11:50:45,301 ERROR [stderr] (default task-339) at io.undertow.util.HttpString.appendTo(HttpString.java:204) 11:50:45,301 ERROR [stderr] (default task-339) at io.undertow.server.protocol.http.HttpResponseConduit.processWrite(HttpResponseConduit.java:150) 11:50:45,301 ERROR [stderr] (default task-339) at io.undertow.server.protocol.http.HttpResponseConduit.flush(HttpResponseConduit.java:629) 11:50:45,301 ERROR [stderr] (default task-339) at io.undertow.conduits.AbstractFixedLengthStreamSinkConduit.flush(AbstractFixedLengthStreamSinkConduit.java:205) 11:50:45,301 ERROR [stderr] (default task-339) at org.xnio.conduits.ConduitStreamSinkChannel.flush(ConduitStreamSinkChannel.java:162) 11:50:45,301 ERROR [stderr] (default task-339) at io.undertow.channels.DetachableStreamSinkChannel.flush(DetachableStreamSinkChannel.java:100) 11:50:45,301 ERROR [stderr] (default task-339) at io.undertow.server.HttpServerExchange.closeAndFlushResponse(HttpServerExchange.java:1489) 11:50:45,317 ERROR [stderr] (default task-339) at io.undertow.server.HttpServerExchange.endExchange(HttpServerExchange.java:1470) 11:50:45,317 ERROR [stderr] (default task-339) at io.undertow.server.Connectors.executeRootHandler(Connectors.java:201) 11:50:45,317 ERROR [stderr] (default task-339) at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:727) 11:50:45,317 ERROR [stderr] (default task-339) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 11:50:45,317 ERROR [stderr] (default task-339) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 11:50:45,317 ERROR [stderr] (default task-339) at java.lang.Thread.run(Thread.java:745) And then, I think this errors lead to a OutOfMemory crash: 14:23:09,592 ERROR [org.xnio.listener] (default I/O-3) XNIO001007: A channel event listener threw an exception: java.lang.OutOfMemoryError at sun.misc.Unsafe.allocateMemory(Native Method) [rt.jar:1.8.0_20] at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:127) [rt.jar:1.8.0_20] at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311) [rt.jar:1.8.0_20] at org.xnio.BufferAllocator$2.allocate(BufferAllocator.java:57) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.BufferAllocator$2.allocate(BufferAllocator.java:55) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ByteBufferSlicePool.allocate(ByteBufferSlicePool.java:149) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ssl.JsseSslConduitEngine.<init>(JsseSslConduitEngine.java:143) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ssl.JsseSslStreamConnection.<init>(JsseSslStreamConnection.java:71) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ssl.JsseAcceptingSslStreamConnection.accept(JsseAcceptingSslStreamConnection.java:45) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ssl.JsseAcceptingSslStreamConnection.accept(JsseAcceptingSslStreamConnection.java:37) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ssl.AbstractAcceptingSslChannel.accept(AbstractAcceptingSslChannel.java:187) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:289) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ChannelListeners$10.handleEvent(ChannelListeners.java:286) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ChannelListeners$DelegatingChannelListener.handleEvent(ChannelListeners.java:1092) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92) [xnio-api-3.2.2.Final.jar:3.2.2.Final] at org.xnio.nio.NioTcpServerHandle.handleReady(NioTcpServerHandle.java:53) [xnio-nio-3.2.2.Final.jar:3.2.2.Final] at org.xnio.nio.WorkerThread.run(WorkerThread.java:539) [xnio-nio-3.2.2.Final.jar:3.2.2.Final] I also have found that if I perform a full GC manually the server recovers, but it can not recover by itself, by performing other types of GCs.