Unexpected concurrent LoggerContext initialization

Hello! Does anybody have an idea why the following test fails for CONCURRENT execution mode, whereas it works for SAME_THREAD? import org.apache.logging.log4j.Level; import org.apache.logging.log4j.Logger; import org.apache.logging.log4j.core.LoggerContext; import org.apache.logging.log4j.core.con

Review Request: LOG4J2-3060 LOG4J2-3185 Fix thread-safety issues in DefaultErrorHandler

Would you mind reviewing #597 addressing thread-safety issues reported in LOG4J2-3060 LOG4J2-3185 , please?