[jira] [Created] (LOG4J2-3103) ComodificationException in concurrent access to LoggerContext::stop

["Mike (Jira)" <ji...@apache.org>]

Mike created LOG4J2-3103:
----------------------------

             Summary: ComodificationException in concurrent access to LoggerContext::stop
                 Key: LOG4J2-3103
                 URL: https://issues.apache.org/jira/browse/LOG4J2-3103
             Project: Log4j 2
          Issue Type: Bug
          Components: Appenders
    Affects Versions: 2.14.1
            Reporter: Mike


Mostly just happens in integration tests, but if two concurrent processes both attempt to stop and add new shutdown listeners at the same time, you can see the following exception:

{code}
Caused by: java.util.ConcurrentModificationException
	at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1043)
	at java.base/java.util.ArrayList$Itr.next(ArrayList.java:997)
	at org.apache.logging.log4j.core.LoggerContext.stop(LoggerContext.java:405)
	at org.apache.logging.log4j.core.async.AsyncLoggerContext.stop(AsyncLoggerContext.java:106)
	at com.palantir.sls.logging.log4j.service.Log4jServiceLogging.shutdown(Log4jServiceLogging.java:152)
	at com.palantir.witchcraft.logging.log4j.Log4jLoggingFramework.shutdown(Log4jLoggingFramework.java:124)
	at com.palantir.witchcraft.logging.log4j.Log4jLoggingFramework.initialize(Log4jLoggingFramework.java:59)
	at com.palantir.witchcraft.logging.LoggingFrameworks.initialize(LoggingFrameworks.java:41)
	at com.palantir.witchcraft.logging.Logging.configureDefault(Logging.java:76)
{code}

Proposed fix: https://github.com/apache/logging-log4j2/pull/508



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