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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-1457) Class loader deadlock when using async logging
Date Wed, 06 Jul 2016 18:22:11 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15364804#comment-15364804
] 

Ralph Goers commented on LOG4J2-1457:
-------------------------------------

I found https://bugs.openjdk.java.net/browse/JDK-8072592, but you have indicated in the email
thread that you do not create any custom ClassLoaders and are only using the standard ClassLoaders
provided by the JVM.

> Class loader deadlock when using async logging
> ----------------------------------------------
>
>                 Key: LOG4J2-1457
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1457
>             Project: Log4j 2
>          Issue Type: Bug
>    Affects Versions: 2.6.1
>         Environment: On CentOS 6.7 and Java 1.8.0_60.
>            Reporter: Leon Finker
>            Priority: Critical
>         Attachments: threaddump.txt
>
>
> We've encountered a class loading deadlock. Please review attached thread dump. Is it
possible to have an option of pre-initializing the exception's thread stack on the caller's
thread? It's hard to predict what libraries are doing in their classes' static initializers
and may eventually end up logging and causing deadlock.
> In the attached thread dump here are the threads of interest:
> "Log4j2-AsyncLogger[AsyncContext@18b4aac2]1" #16 daemon prio=5 os_prio=0 tid=0x00007ff870c7b000
nid=0x79f3 in Object.wait() [0x00007ff839142000]
>    java.lang.Thread.State: RUNNABLE
>         at java.lang.Class.forName0(Native Method)
> ...
> and
> "1A03340:Company:japan" #568 prio=5 os_prio=0 tid=0x00007ff871677000 nid=0x725 runnable
[0x00007ff74bd27000]
> ...<clinit>...



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