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  1. Log4j 2
  2. LOG4J2-3026

WatchManager does not stop its ConfigurationScheduler thereby leaking a thread

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Not A Problem
    • 2.14.0
    • 3.0.0, 2.14.1
    • Core
    • None

    Description

      The WatchManager does not stop its ConfigurationScheduler thereby leaking a thread as reported by Tomcat 9:

      24-Feb-2021 14:13:49.747 WARNING [http-nio-8080-exec-9] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [discoveryrecorder] appears to have started a thread named [Log4j2-TF-8-Scheduled-2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
       sun.misc.Unsafe.park(Native Method)
       java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
       java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
       java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
       java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
       java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074)
       java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
       java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
       java.lang.Thread.run(Thread.java:748)
      

      I am experiencing this in 2.14.0 but it looks to have been a bug since day 1.
      Windows 10, Java 8.

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            ggregory Gary D. Gregory
            ggregory Gary D. Gregory
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              Updated:
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