[Anthill] Tomcat/AnthillPro Locks Up

[Al Veitas]

Hello,

 

We are currently running AntHillPro on a Linux box running RedHat
(2.4.20-20.9), Tomcat 4.1 and JDK 1.4.2_02.

 

Consistently, we see Tomcat "lock up", when we try and hit the
AntHillPro home page after it has been running overnight.

 

Doing a "kill -3" on the Tomcat process, there seems to be a deadlock
between 2 threads that are trying to access the same instance of an
ArrayList, within the Anthill code base (in
DefaultBuildQueue.getBuildableIterator() and DefaultBuildQueue.a()).

 

The following output is from the "kill -3 <tomcat_pid>.  Can someone
verify that this is some sort of deadlock?  Is this a known issue??

 

Thanks,

            Al

 

---- START THREAD OUTPUT FOR 2 SUSPECT THREADS------

 

"http8080-Processor2" daemon prio=1 tid=0x08870d20 nid=0x1edd waiting
for monitor entry [530df000..530e0714]

            at
com.urbancode.anthill2.impl.queue.DefaultBuildQueue.getBuildableIterator
(Unknown Source)

            - waiting to lock <0x4586cbb0> (a java.util.ArrayList)

            at
anthill.ui.urbancode.defaultui.view_pgl.service(view_pgl.java:158)

            at com.urbancode.pagelet.Pagelet.service(Pagelet.java:249)

            - locked <0x45c92a20> (a com.urbancode.pagelet.Pagelet)

            at
com.urbancode.anthill2.ui.AnthillUIPageletFactory.service(Unknown
Source)

            at
com.urbancode.anthill2.ui.AnthillUIPageletFactory.service(Unknown
Source)

            at
com.urbancode.anthill2.ui.command.DefaultUIModuleCommand.execute(Unknown
Source)

            at
com.urbancode.anthill2.impl.ui.DefaultUIModule.serviceCommand(Unknown
Source)

            at com.urbancode.anthill2.ui.AnthillServlet.a(Unknown
Source)

            at com.urbancode.anthill2.ui.AnthillServlet.doPost(Unknown
Source)

            at com.urbancode.anthill2.ui.AnthillServlet.doGet(Unknown
Source)

            at
javax.servlet.http.HttpServlet.service(HttpServlet.java:740)

            at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

            at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:247)

            at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:193)

            at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:256)

            at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)

            at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)

            at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

            at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:191)

            at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)

            at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)

            at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

            at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:242
2)

            at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:180)

            at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)

            at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherVa
lve.java:171)

            at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)

            at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:163)

            at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:641)

            at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)

            at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

            at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
java:174)

            at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:643)

            at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
80)

            at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)

            at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:199)

            at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:82
8)

            at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC
onnection(Http11Protocol.java:700)

            at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:58
4)

            at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.java:683)

            at java.lang.Thread.run(Thread.java:534)

 

 

 

 

"Thread-7" daemon prio=1 tid=0x081c6c88 nid=0x1edd waiting on condition
[520b0000..520b0714]

            at
com.urbancode.anthill2.impl.queue.DefaultBuildQueue.a(Unknown Source)

            at
com.urbancode.anthill2.impl.queue.DefaultBuildQueue.add(Unknown Source)

            - locked <0x4586cbb0> (a java.util.ArrayList)

            - locked <0x4586b048> (a
com.urbancode.anthill2.impl.queue.DefaultBuildQueue)

            at
com.urbancode.anthill2.impl.schedule.BasicSchedule.activateSchedualables
(Unknown Source)

            - locked <0x4587eef0> (a java.util.HashSet)

            at
com.urbancode.anthill2.impl.schedule.BasicSchedule.run(Unknown Source)

            - locked <0x45879db0> (a
com.urbancode.anthill2.impl.schedule.BasicSchedule)

            at java.lang.Thread.run(Thread.java:534)

 

 

---- END THREAD OUTPUT FOR 2 SUSPECT THREADS------

 

 

 

 

 

 

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