[logback-dev] [JIRA] Created: (LBCLASSIC-154) All threads become blocked in ReconfigureOnChangeFilter when changing log level under load

[Andrew Perrine (JIRA)]

All threads become blocked in ReconfigureOnChangeFilter when changing log level under load
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                 Key: LBCLASSIC-154
                 URL: http://jira.qos.ch/browse/LBCLASSIC-154
             Project: logback-classic
          Issue Type: Bug
    Affects Versions: 0.917
         Environment: Linux metro2a.star.dev.diginsite.com 2.6.18-128.1.1.el5 #1 SMP Mon Jan 26 13:58:24 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
Java(TM) SE Runtime Environment (build 1.6.0_11-b03)
Java HotSpot(TM) 64-Bit Server VM (build 11.0-b16, mixed mode)
            Reporter: Andrew Perrine
            Assignee: Logback dev list


We were testing logback's new <configuration scan="true"> feature and when we changed the logging level while our application was under load, all threads became blocked inside logback (full stack trace is very long, here are two examples):

"http-0.0.0.0-8080-148" daemon prio=10 tid=0x00002aab58679800 nid=0x26ed waiting for monitor entry [0x000000004e617000..0x000000004e618c10]
   java.lang.Thread.State: BLOCKED (on object monitor)
        at ch.qos.logback.classic.turbo.ReconfigureOnChangeFilter.decide(ReconfigureOnChangeFilter.java:99)
        - waiting to lock <0x00002aaabd743d58> (a ch.qos.logback.classic.LoggerContext)
        at ch.qos.logback.classic.spi.TurboFilterList.getTurboFilterChainDecision(TurboFilterList.java:47)
        at ch.qos.logback.classic.LoggerContext.getTurboFilterChainDecision_0_3OrMore(LoggerContext.java:251)
        at ch.qos.logback.classic.Logger.callTurboFilters(Logger.java:770)
        at ch.qos.logback.classic.Logger.isDebugEnabled(Logger.java:488)
        at ch.qos.logback.classic.Logger.isDebugEnabled(Logger.java:484)
        at org.slf4j.ext.LoggerWrapper.debug(LoggerWrapper.java:238)
        at com.diginsite.product.ofx.presentation.CustomRequestWrapper.addCNtoOFXRequest(OFXFilter.java:191)
        at com.diginsite.product.ofx.presentation.CustomRequestWrapper.<init>(OFXFilter.java:153)
        at com.diginsite.product.ofx.presentation.OFXFilter.doFilter(OFXFilter.java:56)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.hyperic.hq.product.servlet.filter.JMXFilter.doFilter(JMXFilter.java:324)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        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:230)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
        at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
        at java.lang.Thread.run(Thread.java:619)

"http-0.0.0.0-8080-15" daemon prio=10 tid=0x00002aab600b0400 nid=0x5669 waiting on condition [0x0000000046799000..0x000000004679ac10]
   java.lang.Thread.State: WAITING (parking)
        at sun.misc.Unsafe.park(Native Method)
        - parking to wait for  <0x00002aaabd755128> (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:877)
        at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1197)
        at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:594)
        at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:57)
        at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:271)
        at ch.qos.logback.classic.Logger.callAppenders(Logger.java:258)
        at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:440)
        at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:394)
        at ch.qos.logback.classic.Logger.log(Logger.java:813)
        at org.slf4j.ext.EventLogger.logEvent(EventLogger.java:36)
        at com.diginsite.services.logging.LoggerUtil.logEvent(LoggerUtil.java:29)


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