Jamie created LOGBACK-1424: ------------------------------ Summary: high contention at ch.qos.logback.core.AsyncAppenderBase.putUninterruptibly Key: LOGBACK-1424 URL: https://jira.qos.ch/browse/LOGBACK-1424 Project: logback Issue Type: Bug Components: logback-core Affects Versions: 1.2.3 Environment: Linux server.com 4.15.0-33-generic #36-Ubuntu SMP Wed Aug 15 16:00:05 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Reporter: Jamie Assignee: Logback dev list Attachments: cat.zip Disclaimer: I am not sure this is a bug (please excuse if not the case and it is fault in our code somewhere). However, our server stopped processing data yesterday.  All threads were found waiting on AsyncAppenderBase.putUninterruptibly. Stack trace outputted below. To see a comprehensive snapshot of all threads, please visit [http://fastthread.io/] and upload the attached cat.zip file. Click on the filequeue-worker link in the Thread Group section to see the problem. {code:java} worker-374 - priority:5 - threadId:0x00007fe456176000 - nativeId:0x313 - state:WAITING stackTrace: java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x0000000646f11d48> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.ArrayBlockingQueue.put(ArrayBlockingQueue.java:353) at ch.qos.logback.core.AsyncAppenderBase.putUninterruptibly(AsyncAppenderBase.java:181) at ch.qos.logback.core.AsyncAppenderBase.put(AsyncAppenderBase.java:172) at ch.qos.logback.core.AsyncAppenderBase.append(AsyncAppenderBase.java:161) at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:84) at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:51) at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270) at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257) at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:421) at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:383) at ch.qos.logback.classic.Logger.error(Logger.java:522) {code}   -- This message was sent by Atlassian JIRA (v7.3.1#73012)