So where's the deadlock in this stack dump? Bryan Basham wrote:
Hi all,This might not be the right forum for this. Let em know if I should post this to the tomcat-dev alias. THE PROBLEM The problem we are experience is that occasionally Tomcat (5.5.20) is deadlocking; see the attached output from a kill -3 on the tomcat process. Has anyone seen this happen? Did you discover why this is happening? And most importantly: How did you fix it? THE BACKGROUND I am working on a project in which our architecture requires "pluggable" modules. In the first two iterations, we avoided that requirement by building all modules into a single ROOT.war webapp. Now in this iteration we are "teasing apart" these into separately loaded moduleXYZ.war files. This has caused lots of headaches; especially around getting JSF to handle cross-context (cross-webapp) navigation and bean management. We have pretty much solved the JSF issues, some fixes required doing things like performing cross-context dispatching and merging of JSF's RuntimeConfig objects from each webapp ServletContext. However, I don't see how any of these changes would cause the deadlock. Sincere thanks, Bryan ------------------------------------------------------------------------ "Java2D Disposer" daemon prio=1 tid=0x08af2f10 nid=0xf1d in Object.wait() [0x9bda3000..0x9bda40d0] at java.lang.Object.wait(Native Method) - waiting on <0xa03bf8a8> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116) - locked <0xa03bf8a8> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132) at sun.java2d.Disposer.run(Disposer.java:107) at java.lang.Thread.run(Thread.java:595) "Timer-3" daemon prio=1 tid=0x083667f8 nid=0xe9c in Object.wait() [0x9be41000..0x9be42150] at java.lang.Object.wait(Native Method) - waiting on <0x9ff8d648> (a java.util.TaskQueue) at java.util.TimerThread.mainLoop(Timer.java:509) - locked <0x9ff8d648> (a java.util.TaskQueue) at java.util.TimerThread.run(Timer.java:462) "TP-Monitor" daemon prio=1 tid=0x0837ab30 nid=0xe9b in Object.wait() [0x9bec2000..0x9bec2ed0] at java.lang.Object.wait(Native Method) - waiting on <0x9ff8d688> (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable) at org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run(ThreadPool.java:559) - locked <0x9ff8d688> (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable) at java.lang.Thread.run(Thread.java:595) "TP-Processor4" daemon prio=1 tid=0x083615e8 nid=0xe9a runnable [0x9bf43000..0x9bf43e50] at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384) - locked <0x9ff8d6b0> (a java.net.SocksSocketImpl) at java.net.ServerSocket.implAccept(ServerSocket.java:450) at java.net.ServerSocket.accept(ServerSocket.java:421) at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:306) at org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:660) at org.apache.jk.common.ChannelSocket$SocketAcceptor.runIt(ChannelSocket.java:870) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) "TP-Processor3" daemon prio=1 tid=0x083603d0 nid=0xe99 in Object.wait() [0x9bfc4000..0x9bfc4fd0] at java.lang.Object.wait(Native Method) - waiting on <0x9ff8d8d8> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Object.wait(Object.java:474) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:656) - locked <0x9ff8d8d8> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Thread.run(Thread.java:595) "TP-Processor2" daemon prio=1 tid=0x0835f288 nid=0xe98 in Object.wait() [0x9c045000..0x9c045f50] at java.lang.Object.wait(Native Method) - waiting on <0x9ff8d8f8> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Object.wait(Object.java:474) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:656) - locked <0x9ff8d8f8> (a org.apache.tomcat.util.threads.ThreadPool$ControlRunnable) at java.lang.Thread.run(Thread.java:595)
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