Work on LOG4J2-2301 started by Carter Kozak.
> gc-free mixed async loging loses parameter values after the first appender
> --------------------------------------------------------------------------
>                 Key: LOG4J2-2301
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-2301
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.11.0
>            Reporter: Carter Kozak
>            Assignee: Carter Kozak
>            Priority: Major
> When gc-free logging is used with mixed synchronous/asynchronous loggers, 
> parameter values are replaced with "null" after the first AsyncLoggerConfig.
> The message format is still present, as well as the parameter count, however 
> all values are nulls.
> It appears that Log4jEventWrapperHandler.onEvent invokes 
> MutableLogEvent.clear, which nulls out the parameter array.
> I have constructed a failing test (which I need to clean up and deduplicate 
> some code from the fix for LOG4J2-2299):
> https://github.com/cakofony/logging-log4j2/commit/b9c03f5c6881bfe778f8e2d75d046ce6e021c4f1

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