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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LOG4J2-1457) Class loader deadlock when using async logging
Date Mon, 18 Jul 2016 23:45:20 GMT

     [ https://issues.apache.org/jira/browse/LOG4J2-1457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Remko Popma updated LOG4J2-1457:
--------------------------------
    Fix Version/s: 2.7

I assume we want to include this in the next release so I've set the fix version. Who will
take care of this one?

> 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
>             Fix For: 2.7
>
>         Attachments: LOG4J2-1457.patch, 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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