[logback-dev] [JIRA] Created: (LBCORE-96) Deadlock when running on multiple core processors

6 Apr 2009

      Deadlock when running on multiple core processors
-------------------------------------------------

                 Key: LBCORE-96
                 URL: http://jira.qos.ch/browse/LBCORE-96
             Project: logback-core
          Issue Type: Bug
          Components: Appender
    Affects Versions: 0.9.15
         Environment: Windows Vista
quad core
Apache Tomcat 6.0.18
JDK 1.6
            Reporter: Lars Feistner
            Assignee: Logback dev list

As Robert Dale mentioned on  23/Mar/09 04:05 PM
I'm getting that deadlock in logback core (0.9.14 and 0.9.15). No console plugin or socket appenders, just plain RollingFileAppender.

I am getting the deadlock using ConsoleAppender.

see attached thread dump:

2009-04-06 11:49:45
Full thread dump Java HotSpot(TM) Client VM (11.0-b12 mixed mode, sharing):

"http-8084-5" daemon prio=6 tid=0x04700c00 nid=0xc54 in Object.wait() [0x05d1f000..0x05d1fc68]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x24338c70> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
	at java.lang.Object.wait(Object.java:485)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:416)
	- locked <0x24338c70> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:442)
	at java.lang.Thread.run(Thread.java:619)

"http-8084-4" daemon prio=6 tid=0x04700000 nid=0xe24 in Object.wait() [0x05c7f000..0x05c7fbe8]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x24254da8> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
	at java.lang.Object.wait(Object.java:485)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.await(JIoEndpoint.java:416)
	- locked <0x24254da8> (a org.apache.tomcat.util.net.JIoEndpoint$Worker)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:442)
	at java.lang.Thread.run(Thread.java:619)

"http-8084-3" daemon prio=6 tid=0x04700400 nid=0x134c waiting for monitor entry [0x05c2f000..0x05c2fa68]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at ch.qos.logback.core.AppenderBase.doAppend(AppenderBase.java:66)
	- waiting to lock <0x23b16ac8> (a ch.qos.logback.core.ConsoleAppender)
	at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:60)
	at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270)
	at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257)
	at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:439)
	at ch.qos.logback.classic.Logger.filterAndLog_1(Logger.java:411)
	at ch.qos.logback.classic.Logger.debug(Logger.java:504)
	at de.ims.server.jguard.ImsRemoteServiceServlet.processCall(ImsRemoteServiceServlet.java:88)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Thread.java:619)

"Thread-10" daemon prio=6 tid=0x046ff800 nid=0x122c runnable [0x05bdf000..0x05bdfb68]
   java.lang.Thread.State: RUNNABLE
	at sun.net.dns.ResolverConfigurationImpl.notifyAddrChange0(Native Method)
	at sun.net.dns.ResolverConfigurationImpl$AddressChangeListener.run(ResolverConfigurationImpl.java:125)

"http-8084-2" daemon prio=6 tid=0x046ff400 nid=0x17f4 waiting for monitor entry [0x05b8f000..0x05b8fa68]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at ch.qos.logback.core.AppenderBase.doAppend(AppenderBase.java:66)
	- waiting to lock <0x23b16ac8> (a ch.qos.logback.core.ConsoleAppender)
	at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:60)
	at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270)
	at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257)
	at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:439)
	at ch.qos.logback.classic.Logger.filterAndLog_1(Logger.java:411)
	at ch.qos.logback.classic.Logger.debug(Logger.java:504)
	at de.ims.server.jguard.ImsRemoteServiceServlet.processCall(ImsRemoteServiceServlet.java:88)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Thread.java:619)

"TP-Monitor" daemon prio=6 tid=0x04a17400 nid=0x830 in Object.wait() [0x05b3f000..0x05b3fce8]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x23e0a900> (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
	at org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run(ThreadPool.java:565)
	- locked <0x23e0a900> (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
	at java.lang.Thread.run(Thread.java:619)

"TP-Processor4" daemon prio=6 tid=0x0497a000 nid=0x11dc runnable [0x05a8f000..0x05a8fd68]
   java.lang.Thread.State: RUNNABLE
	at java.net.PlainSocketImpl.socketAccept(Native Method)
	at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
	- locked <0x23e0a9b0> (a java.net.SocksSocketImpl)
	at java.net.ServerSocket.implAccept(ServerSocket.java:453)
	at java.net.ServerSocket.accept(ServerSocket.java:421)
	at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:306)
	at org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:660)
	at org.apache.jk.common.ChannelSocket$SocketAcceptor.runIt(ChannelSocket.java:870)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
	at java.lang.Thread.run(Thread.java:619)

"TP-Processor3" daemon prio=6 tid=0x04979c00 nid=0xfe8 in Object.wait() [0x05a3f000..0x05a3f9e8]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x23e0abc8> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
	at java.lang.Object.wait(Object.java:485)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:662)
	- locked <0x23e0abc8> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
	at java.lang.Thread.run(Thread.java:619)

"TP-Processor2" daemon prio=6 tid=0x04982800 nid=0x10bc in Object.wait() [0x059ef000..0x059efa68]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x23e0ac68> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
	at java.lang.Object.wait(Object.java:485)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:662)
	- locked <0x23e0ac68> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
	at java.lang.Thread.run(Thread.java:619)

"TP-Processor1" daemon prio=6 tid=0x04982000 nid=0x131c in Object.wait() [0x0599f000..0x0599fae8]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x23e0ad08> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
	at java.lang.Object.wait(Object.java:485)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:662)
	- locked <0x23e0ad08> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
	at java.lang.Thread.run(Thread.java:619)

"http-8084-1" daemon prio=6 tid=0x04917000 nid=0x15f4 runnable [0x0594f000..0x0594fb68]
   java.lang.Thread.State: RUNNABLE
	at java.io.FileOutputStream.writeBytes(Native Method)
	at java.io.FileOutputStream.write(FileOutputStream.java:260)
	at java.io.BufferedOutputStream.write(BufferedOutputStream.java:105)
	- locked <0x2395d280> (a java.io.BufferedOutputStream)
	at java.io.PrintStream.write(PrintStream.java:430)
	- locked <0x23951d08> (a java.io.PrintStream)
	at org.apache.tomcat.util.log.SystemLogHandler.write(SystemLogHandler.java:166)
	at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:202)
	at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:272)
	at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:276)
	at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:122)
	- locked <0x23b1c1f0> (a java.io.OutputStreamWriter)
	at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:212)
	at ch.qos.logback.core.WriterAppender.writerWrite(WriterAppender.java:245)
	at ch.qos.logback.core.WriterAppender.subAppend(WriterAppender.java:261)
	at ch.qos.logback.core.WriterAppender.append(WriterAppender.java:114)
	at ch.qos.logback.core.AppenderBase.doAppend(AppenderBase.java:87)
	- locked <0x23b16ac8> (a ch.qos.logback.core.ConsoleAppender)
	at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:60)
	at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270)
	at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257)
	at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:439)
	at ch.qos.logback.classic.Logger.filterAndLog_1(Logger.java:411)
	at ch.qos.logback.classic.Logger.debug(Logger.java:504)
	at de.ims.server.jguard.ImsRemoteServiceServlet.processCall(ImsRemoteServiceServlet.java:92)
	at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Thread.java:619)

"http-8084-Acceptor-0" daemon prio=6 tid=0x049c2400 nid=0x129c runnable [0x058bf000..0x058bfbe8]
   java.lang.Thread.State: RUNNABLE
	at java.net.PlainSocketImpl.socketAccept(Native Method)
	at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
	- locked <0x23a40168> (a java.net.SocksSocketImpl)
	at java.net.ServerSocket.implAccept(ServerSocket.java:453)
	at java.net.ServerSocket.accept(ServerSocket.java:421)
	at org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(DefaultServerSocketFactory.java:61)
	at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:310)
	at java.lang.Thread.run(Thread.java:619)

"ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon prio=6 tid=0x051c9800 nid=0x152c waiting on condition [0x0452f000..0x0452fc68]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
	at java.lang.Thread.sleep(Native Method)
	at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1579)
	at java.lang.Thread.run(Thread.java:619)

"Thread-1" daemon prio=2 tid=0x04638c00 nid=0x1360 in Object.wait() [0x044df000..0x044dfce8]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x23b87d30> (a EDU.oswego.cs.dl.util.concurrent.ClockDaemon)
	at EDU.oswego.cs.dl.util.concurrent.ClockDaemon.nextTask(ClockDaemon.java:328)
	- locked <0x23b87d30> (a EDU.oswego.cs.dl.util.concurrent.ClockDaemon)
	at EDU.oswego.cs.dl.util.concurrent.ClockDaemon$RunLoop.run(ClockDaemon.java:362)
	at java.lang.Thread.run(Thread.java:619)

"ElementEventQueue.QProcessor-1" daemon prio=6 tid=0x050f2800 nid=0x17d0 in Object.wait() [0x0442f000..0x0442fd68]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x23b81398> (a java.lang.Object)
	at java.lang.Object.wait(Object.java:485)
	at org.apache.jcs.engine.control.event.ElementEventQueue.take(ElementEventQueue.java:181)
	- locked <0x23b81398> (a java.lang.Object)
	at org.apache.jcs.engine.control.event.ElementEventQueue.access$300(ElementEventQueue.java:35)
	at org.apache.jcs.engine.control.event.ElementEventQueue$QProcessor.run(ElementEventQueue.java:245)

"Low Memory Detector" daemon prio=6 tid=0x0215c800 nid=0x1370 runnable [0x00000000..0x00000000]
   java.lang.Thread.State: RUNNABLE

"CompilerThread0" daemon prio=10 tid=0x02156400 nid=0x758 waiting on condition [0x00000000..0x0433f890]
   java.lang.Thread.State: RUNNABLE

"Attach Listener" daemon prio=10 tid=0x02155400 nid=0x14f4 waiting on condition [0x00000000..0x00000000]
   java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" daemon prio=10 tid=0x0214ac00 nid=0x151c runnable [0x00000000..0x00000000]
   java.lang.Thread.State: RUNNABLE

"Finalizer" daemon prio=8 tid=0x02143000 nid=0x430 in Object.wait() [0x0424f000..0x0424fce8]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x2394e760> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
	- locked <0x2394e760> (a java.lang.ref.ReferenceQueue$Lock)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
	at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=10 tid=0x02141000 nid=0x510 in Object.wait() [0x0091f000..0x0091fc68]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x2394e7e8> (a java.lang.ref.Reference$Lock)
	at java.lang.Object.wait(Object.java:485)
	at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
	- locked <0x2394e7e8> (a java.lang.ref.Reference$Lock)

"main" prio=6 tid=0x0020a800 nid=0xef4 runnable [0x0025f000..0x0025fe28]
   java.lang.Thread.State: RUNNABLE
	at java.net.PlainSocketImpl.socketAccept(Native Method)
	at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
	- locked <0x23e18dc0> (a java.net.SocksSocketImpl)
	at java.net.ServerSocket.implAccept(ServerSocket.java:453)
	at java.net.ServerSocket.accept(ServerSocket.java:421)
	at org.apache.catalina.core.StandardServer.await(StandardServer.java:389)
	at org.apache.catalina.startup.Catalina.await(Catalina.java:642)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:602)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

"VM Thread" prio=10 tid=0x0213fc00 nid=0xdc0 runnable 

"VM Periodic Task Thread" prio=10 tid=0x0215dc00 nid=0x1128 waiting on condition 

JNI global references: 781

i also attach my logback configuration:
<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="true">

	<appender name="stdout"
		class="ch.qos.logback.core.ConsoleAppender">
		<layout class="ch.qos.logback.classic.PatternLayout">
			<Pattern>
				Operator %X{client}: %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} %L - %msg%n
			</Pattern>
		</layout>
	</appender>

	<!--
	<appender name="file"
        class="ch.qos.logback.core.FileAppender" >
        <File>imsm-debug.log</File>
        <Append>false</Append>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>
                %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} %L - %msg%n
            </Pattern>
        </layout>

    </appender>
-->
	<logger name="net.sf.jguard.core" additivity="false">
		<level value="INFO" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>

	<logger name="net.sf.jguard.core.authorization" additivity="false">
	   <level value="debug"/>
	   <appender-ref ref="stdout" />
       <!--<appender-ref ref="file" />-->
    </logger>

    <logger name="net.sf.jguard.core.filters" additivity="false">
       <level value="debug"/>
       <appender-ref ref="stdout" />
       <!--<appender-ref ref="file" />-->
    </logger>

	<logger name="net.sf.jguard.ext" additivity="false">
		<level value="INFO" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>

	<logger name="net.sf.jguard.jee" additivity="false">
		<level value="INFO" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>

	<logger name="net.sf.ehcache" additivity="false">
		<level value="INFO" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>

	<logger name="de.ims.core.db" additivity="false">
		<level value="DEBUG" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>

    <logger name="de.ims.core.db.util" additivity="false">
		<level value="INFO" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>

    <logger name="de.ims.core.db.jguard" additivity="false">
		<level value="INFO" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>

    <logger name="de.ims.core.db.DBUserImpl" additivity="false">
		<level value="DEBUG" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>
    <logger name="de.ims.core.db.DBGroupImpl" additivity="false">
		<level value="DEBUG" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>
    <logger name="de.ims.core.db.DBOperatorImpl" additivity="false">
		<level value="INFO" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>
    <logger name="de.ims.core.db.DBInstitutionImpl" additivity="false">
		<level value="INFO" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</logger>

	<logger name="org.apache.jcs" additivity="false">
	   <level value="WARN" />
       <appender-ref ref="stdout" />
       <!--<appender-ref ref="file" />-->
    </logger>

	<root>
		<!-- The following level element is not necessary since the -->
		<!-- level of the root level is set to DEBUG by default.    -->
		<level value="DEBUG" />
		<appender-ref ref="stdout" />
		<!--<appender-ref ref="file" />-->
	</root>
</configuration>

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[logback-dev] [JIRA] Created: (LBCORE-96) Deadlock when running on multiple core processors

Lars Feistner (JIRA)