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https://issues.apache.org/jira/browse/LOG4J2-1634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikael Ståldal updated LOG4J2-1634:
-----------------------------------
Affects Version/s: 2.7
> Root LoggerConfig is corrupted leading to stack overflow
> --------------------------------------------------------
>
> Key: LOG4J2-1634
> URL: https://issues.apache.org/jira/browse/LOG4J2-1634
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.6.2, 2.7
> Reporter: Rod Burgett
> Attachments: ReproLoggerConfigBug.java
>
>
> The simple repro code below demonstrates the corruption of the LoggerConfig
> instance for root logger. Executing the main leads to unstopped recursion,
> leading to stack overflow. The recursion includes three method calls, shown
> in this stack trace fragment:
> at
> org.apache.logging.log4j.core.config.LoggerConfig.logParent(LoggerConfig.java:381)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:376)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:359)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.logParent(LoggerConfig.java:381)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:376)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:359)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.logParent(LoggerConfig.java:381)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:376)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:359)
> The basic problem is that 'logParent' becomes no-op (ends recursion) if
> additivity is off or if logger config's parent is null, otherwise recusrion
> continues.
> In the repro case, the root logger config points to itself as parent.
> I expect that when adding a logger to Configuration, the LoggerConfig should
> be specific to the named logger. So, the stack overflow could be avoided if
> Configuration.addLogger checked that the LoggerConfig's name matched the
> input logger name.
> Repro code:
> String loggerName = "new.logger.name";
> LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
> Configuration config = ctx.getConfiguration();
> LoggerConfig logCfg = config.getLoggerConfig(loggerName);
> config.addLogger(loggerName, logCfg);
> ctx.updateLoggers();
> LogManager.getLogger(loggerName).error("...by: "+loggerName+"....");
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