Noobgam opened a new pull request #481:
URL: https://github.com/apache/logging-log4j2/pull/481
When configured incorrectly, the ErrorHandler::error method will be called
very often. As an example of such behavior, you can try stopping the appender
manually.
This will result in `ErrorHandler::error("Attempted to append to non-started
appender {...}")` which may or may not be called often. In our scenario, this
happened ~4k-20k times per second. Although everything seems normal at first,
exceptionCount keeps getting incremented until it overflows after 2^31
increments.
When it increments, every such method call will enter the branch leading to
very high CPU consumption in useless code and a significant spike in
`System.out` throughput
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