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https://issues.apache.org/jira/browse/LOG4J2-1518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15463748#comment-15463748
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Leon Finker commented on LOG4J2-1518:
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Remko, i added sync policy. But it means logging can happen out of sequence
when buffer is full in all cases and not just toString logging case.
> Deadlock when using pure async and toString logs another message
> ----------------------------------------------------------------
>
> Key: LOG4J2-1518
> URL: https://issues.apache.org/jira/browse/LOG4J2-1518
> Project: Log4j 2
> Issue Type: Bug
> Affects Versions: 2.6.2
> Environment: Solaris
> Reporter: Leon Finker
> Assignee: Remko Popma
> Fix For: 2.7
>
> Attachments: 10511.jstack, async_deadlock.txt
>
>
> Hi,
> It looks like this was reported before in: LOG4J2-471
> We've encountered similar issue with one of the libraries where it's toString
> was indirectly also logging. This caused a deadlock when RingBuffer was full.
> Please see attached stack snippet.
> According to the following docs, it's possible to set sync policy to
> synchronously log the event if buffer is full. I don't see it documented.
> What's the policy option?
> https://issues.apache.org/jira/plugins/servlet/mobile#issue/LOG4J2-1080
> https://logging.apache.org/log4j/2.x/log4j-core/apidocs/org/apache/logging/log4j/core/async/AsyncQueueFullPolicyFactory.html
> Thank you
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