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https://issues.apache.org/jira/browse/LOG4J2-3274?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17464662#comment-17464662
]
Faisal Khan commented on LOG4J2-3274:
-------------------------------------
Thank you [~rgoers]. Closing this issue.
> Log4j2 deadlock version 2.16
> ----------------------------
>
> Key: LOG4J2-3274
> URL: https://issues.apache.org/jira/browse/LOG4J2-3274
> Project: Log4j 2
> Issue Type: Bug
> Reporter: Faisal Khan
> Priority: Major
> Attachments: threaddumps
>
>
> My application is a sprint boot application that uses log4j2 and runs in a
> Wildfly server. After the zero day attack, we upgraded to the latest log4j2
> version(2.16). But after the log4j upgrade, my application stops working once
> in a while. And when I looked at the threaddumps, I found that there is a
> deadlock created by log4j.
> When analysing this issue, I came through a possible defect in log4j code.
> Not sure if that can result in a deadlock.
> *Log4J possible bug* - As per the release notes, there was a fix to {*}Enable
> immediate flush on RollingFileAppender when buffered i/o is not enabled.
> (LOG4J2-3114){*}. But the code just does the opposite in
> {*}RollingFileAppenderBuilder{*}.
> It should have been {{{}if(!bufferedIo) \{ immediateFlush = true; }{{}}}}.
> And one of my appender explicitly sets bufferedIo value to true. I know that
> log4j does a bufferedio by default and it is not necessary to set this flag
> explicitly. But unfortunately the code that I am working on is a legacy code
> and the configuration was working fine before the upgrade.
> {{I have added my log4j configuration in here
> [https://stackoverflow.com/questions/70450611/log4j2-deadlock]}}
>
> *Extract from Thread dump:*
> "default task-128" #450 prio=5 os_prio=0 tid=0x00007f31f80cf800 nid=0x14c8
> waiting for monitor entry [0x00007f31a7d88000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.logging.log4j.core.appender.OutputStreamManager.writeBytes(OutputStreamManager.java:352)
> - waiting to lock <0x00000000c0e70eb0> (a
> org.apache.logging.log4j.core.appender.OutputStreamManager)
> at
> org.apache.logging.log4j.core.layout.TextEncoderHelper.writeEncodedText(TextEncoderHelper.java:96)
> at
> org.apache.logging.log4j.core.layout.TextEncoderHelper.encodeText(TextEncoderHelper.java:65)
> at
> org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:68)
> at
> org.apache.logging.log4j.core.layout.StringBuilderEncoder.encode(StringBuilderEncoder.java:32)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:228)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:60)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:197)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:190)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:181)
> at
> org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:161)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:134)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:125)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:89)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:542)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:500)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:483)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.logParent(LoggerConfig.java:533)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:502)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:483)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:388)
> at
> org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
> at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:153)
> at org.apache.logging.slf4j.Log4jLogger.log(Log4jLogger.java:376)
> at
> org.apache.commons.logging.impl.SLF4JLocationAwareLog.error(SLF4JLocationAwareLog.java:203)
> at
> org.springframework.boot.web.support.ErrorPageFilter.handleCommittedResponse(ErrorPageFilter.java:225)
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