log4net意外地将null写入文件

Question

有没有人遇到log4net的错误，当系统挂起时，意外地用RollingFileAppender写了很多null？

文件日志如下所示：

2014-06-05 11:40:45,993 [5156] INFO  myapp.test.Main getStatus
2014-06-05 11:40:45,995 [5156] INFO  myapp.test.Main getStatus
[NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL][NUL]2014-06-05 11:51:58,418 [2992] INFO  myapp.test.Main Start...

log4net版本：1.2.10

下面是log4net.config

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender" >
<file value="C:\Test\Log\log4net-log.txt" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd" />    
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger %message%newline" />
</layout>
</appender>
<appender name="EventLogAppender" type="log4net.Appender.EventLogAppender" >
<applicationName value="Test" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger %message%newline" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingLogFileAppender" />
</root>
</log4net>