fix
```
2024-05-10 14:33:55,005 mysql-nio-pool-67 ERROR An exception occurred processing Appender Sys java.util.ConcurrentModificationException
at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1597)
at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1630)
at java.base/java.util.HashMap$EntryIterator.next(HashMap.java:1628)
at org.apache.logging.log4j.message.ParameterFormatter.appendMap(ParameterFormatter.java:581)
at org.apache.logging.log4j.message.ParameterFormatter.appendPotentiallyRecursiveValue(ParameterFormatter.java:512)
at org.apache.logging.log4j.message.ParameterFormatter.recursiveDeepToString(ParameterFormatter.java:477)
at org.apache.logging.log4j.message.ParameterFormatter.recursiveDeepToString(ParameterFormatter.java:448)
at org.apache.logging.log4j.message.ParameterFormatter.formatMessage2(ParameterFormatter.java:191)
at org.apache.logging.log4j.message.ParameterizedMessage.formatTo(ParameterizedMessage.java:227)
at org.apache.logging.log4j.core.pattern.MessagePatternConverter$SimpleMessagePatternConverter.format(MessagePatternConverter.java:121)
at org.apache.logging.log4j.core.layout.PatternLayout$NoFormatPatternSerializer.toSerializable(PatternLayout.java:342)
at org.apache.logging.log4j.core.layout.PatternLayout.toText(PatternLayout.java:240)
at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:225)
at org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:59)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:215)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:208)
at org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:199)
at org.apache.logging.log4j.core.appender.RollingFileAppender.append(RollingFileAppender.java:301)
at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:161)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:134)
at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:125)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:89)
at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:675)
at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:633)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:616)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:552)
at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:82)
at org.apache.logging.log4j.core.Logger.log(Logger.java:161)
at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2205)
at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2159)
at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2142)
at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2040)
at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1907)
at org.apache.logging.log4j.spi.AbstractLogger.warn(AbstractLogger.java:2789)
at org.apache.doris.mysql.privilege.UserManager.getUserId(UserManager.java:348)
at org.apache.doris.mysql.privilege.Auth.getUserId(Auth.java:1950)
at org.apache.doris.analysis.CreateUserStmt.<init>(CreateUserStmt.java:94)
at org.apache.doris.analysis.CUP$SqlParser$actions.case209(SqlParser.java:51399)
at org.apache.doris.analysis.CUP$SqlParser$actions.CUP$SqlParser$do_action(SqlParser.java:19433)
at org.apache.doris.analysis.SqlParser.do_action(SqlParser.java:2972)
at java_cup.runtime.lr_parser.parse(lr_parser.java:584)
at org.apache.doris.common.util.SqlParserUtils.getMultiStmts(SqlParserUtils.java:60)
at org.apache.doris.qe.ConnectProcessor.parse(ConnectProcessor.java:516)
at org.apache.doris.qe.ConnectProcessor.executeQuery(ConnectProcessor.java:296)
at org.apache.doris.qe.ConnectProcessor.handleQuery(ConnectProcessor.java:232)
at org.apache.doris.qe.MysqlConnectProcessor.handleQuery(MysqlConnectProcessor.java:177)
```