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Re: Need help with a (non) deadlock Issue
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Re: Need help with a (non) deadlock Issue

  • Subject: Re: Need help with a (non) deadlock Issue
  • From: Mike Schrag <email@hidden>
  • Date: Wed, 8 Dec 2010 11:36:52 -0500
you can't spot the deadlock here ... it means a previous thread left the osc locked and went away. because there's no thread BEYOND that lock, it means the thread is gone now and you'll have to try and track down the one the had a problem. I would look for possibly exceptions that were thrown in the logs that might have not had a finally?

On Dec 8, 2010, at 11:27 AM, Greg Lappen wrote:

> Hi everyone, was wondering if anyone was up for a game of "spot the deadlock" today.  I have a thread dump which I have removed duplicates from and cleaned up a bit.  It seems that a lot of threads are BLOCKED waiting on the EOObjectStoreCoordinator.lock() call
>
> Deadlock Detection:
>
> No deadlocks found.
>
> Thread t@44035: (state = BLOCKED)
>  - java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise)
>  - sun.security.pkcs11.SunPKCS11$TokenPoller.run() @bci=20, line=692 (Compiled frame)
>  - java.lang.Thread.run() @bci=11, line=680 (Interpreted frame)
>
>
> Thread t@44291: (state = BLOCKED)
>  - java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=388 (Interpreted frame)
>  - java.net.ServerSocket.implAccept(java.net.Socket) @bci=60, line=453 (Interpreted frame)
>  - java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame)
>  - com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=210 (Interpreted frame)
>  - java.lang.Thread.run() @bci=11, line=680 (Interpreted frame)
>
>
> Thread t@46083: (state = BLOCKED)
>  - sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
>  - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt() @bci=1, line=811 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(java.util.concurrent.locks.AbstractQueuedSynchronizer$Node, int) @bci=48, line=842 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(int) @bci=17, line=1178 (Compiled frame)
>  - java.util.concurrent.locks.ReentrantLock$NonfairSync.lock() @bci=21, line=186 (Compiled frame)
>  - java.util.concurrent.locks.ReentrantLock.lock() @bci=4, line=262 (Compiled frame)
>  - com.webobjects.eocontrol.EOObjectStoreCoordinator.lock() @bci=4, line=420 (Compiled frame)
>  - com.webobjects.eocontrol.EOEditingContext.lockObjectStore() @bci=41, line=4666 (Compiled frame)
>  - com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=70, line=4067 (Interpreted frame)
>  - com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(com.webobjects.eocontrol.EOFetchSpecification) @bci=3, line=4444 (Interpreted frame)
>  - com.webobjects.eoaccess.EOUtilities.objectWithPrimaryKey(com.webobjects.eocontrol.EOEditingContext, java.lang.String, com.webobjects.foundation.NSDictionary) @bci=34, line=461 (Interpreted frame)
>  - com.webobjects.eoaccess.EOUtilities.objectWithPrimaryKeyValue(com.webobjects.eocontrol.EOEditingContext, java.lang.String, java.lang.Object) @bci=10, line=432 (Interpreted frame)
>  - net.paperfree.lightbeam.DocumentEmailAction.deliverDocumentAction() @bci=211, line=59 (Interpreted frame)
>
>
> Thread t@46595: (state = BLOCKED)
>  - sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
>  - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt() @bci=1, line=811 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(java.util.concurrent.locks.AbstractQueuedSynchronizer$Node, int) @bci=48, line=842 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(int) @bci=17, line=1178 (Compiled frame)
>  - java.util.concurrent.locks.ReentrantLock$NonfairSync.lock() @bci=21, line=186 (Compiled frame)
>  - java.util.concurrent.locks.ReentrantLock.lock() @bci=4, line=262 (Compiled frame)
>  - com.webobjects.eocontrol.EOObjectStoreCoordinator.lock() @bci=4, line=420 (Compiled frame)
>  - com.webobjects.eocontrol.EOEditingContext.lockObjectStore() @bci=41, line=4666 (Compiled frame)
>  - com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=70, line=4067 (Interpreted frame)
>  - com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(com.webobjects.eocontrol.EOFetchSpecification) @bci=3, line=4444 (Interpreted
>  frame)
>  - net.paperfree.lightbeam.LBEntityHelper.getTimezones() @bci=20, line=135 (Interpreted frame)
>  - net.paperfree.lightbeam.components.LoginPage.timeZones() @bci=4, line=120 (Interpreted frame)
>
>
> Thread t@48387: (state = BLOCKED)
>  - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
>  - org.quartz.simpl.SimpleThreadPool.runInThread(java.lang.Runnable) @bci=58, line=384 (Compiled frame)
>  - org.quartz.core.QuartzSchedulerThread.run() @bci=665, line=369 (Compiled frame)
>
>
> Thread t@48643: (state = BLOCKED)
>  - net.paperfree.lightbeam.MessageDeliveryJob.execute(org.quartz.JobExecutionContext) @bci=5, line=20 (Interpreted frame)
>  - org.quartz.core.JobRunShell.run() @bci=201, line=203 (Interpreted frame)
>  - org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=49, line=520 (Compiled frame)
>
> Thread t@50947: (state = BLOCKED)
>  - sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
>  - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt() @bci=1, line=811 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(java.util.concurrent.locks.AbstractQueuedSynchronizer$Node, int) @bci=48, line=842 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(int) @bci=17, line=1178 (Compiled frame)
>  - java.util.concurrent.locks.ReentrantLock$NonfairSync.lock() @bci=21, line=186 (Compiled frame)
>  - java.util.concurrent.locks.ReentrantLock.lock() @bci=4, line=262 (Compiled frame)
>  - com.webobjects.eocontrol.EOObjectStoreCoordinator.lock() @bci=4, line=420 (Compiled frame)
>  - com.webobjects.eocontrol.EOEditingContext.lockObjectStore() @bci=41, line=4666 (Compiled frame)
>  - com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=70, line=4067 (Interpreted frame)
>  - com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecification(com.webobjects.eocontrol.EOFetchSpecification) @bci=3, line=4444 (Interpreted frame)
>  - net.paperfree.lightbeam.MessageDeliveryJob.execute(org.quartz.JobExecutionContext) @bci=42, line=25 (Interpreted frame)
>  - org.quartz.core.JobRunShell.run() @bci=201, line=203 (Interpreted frame)
>  - org.quartz.simpl.SimpleThreadPool$WorkerThread.run() @bci=49, line=520 (Compiled frame)
>
>
> Thread t@51203: (state = BLOCKED)
>  - java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise)
>  - org.apache.log4j.helpers.FileWatchdog.run() @bci=11, line=103 (Compiled frame)
>
>
> Thread t@51459: (state = BLOCKED)
>  - java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise)
>  - com.webobjects.appserver.WOApplication$_LifebeatThread.run() @bci=233, line=1619 (Compiled frame)
>
>
> Thread t@51715: (state = BLOCKED)
>  - java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise)
>  - com.webobjects.appserver.WOSessionStore$_SessionTimeoutManager.run() @bci=12, line=98 (Compiled frame)
>  - java.lang.Thread.run() @bci=11, line=680 (Interpreted frame)
>
>
> Thread t@51971: (state = BLOCKED)
>
>
> Thread t@52227: (state = BLOCKED)
>
>
> Thread t@52483: (state = BLOCKED)
>  - sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame)
>  - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14, line=158 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt() @bci=1, line=811 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(java.util.concurrent.locks.AbstractQueuedSynchronizer$Node, int) @bci=48, line=842 (Interpreted frame)
>  - java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(int) @bci=17, line=1178 (Compiled frame)
>  - java.util.concurrent.locks.ReentrantLock$NonfairSync.lock() @bci=21, line=186 (Compiled frame)
>  - java.util.concurrent.locks.ReentrantLock.lock() @bci=4, line=262 (Compiled frame)
>  - com.webobjects.eocontrol.EOObjectStoreCoordinator.lock() @bci=4, line=420 (Compiled frame)
>  - com.webobjects.eocontrol.EOEditingContext.lockObjectStore() @bci=41, line=4666 (Compiled frame)
>  - com.webobjects.eocontrol.EOEditingContext._dispose(boolean) @bci=181, line=1172 (Compiled frame)
>  - com.webobjects.eocontrol.EOEditingContext.finalize() @bci=9, line=1239 (Interpreted frame)
>  - java.lang.ref.Finalizer.invokeFinalizeMethod(java.lang.Object) @bci=0 (Compiled frame)
>  - java.lang.ref.Finalizer.runFinalizer() @bci=45, line=83 (Compiled frame)
>  - java.lang.ref.Finalizer.access$100(java.lang.ref.Finalizer) @bci=1, line=14 (Compiled frame)
>  - java.lang.ref.Finalizer$FinalizerThread.run() @bci=11, line=160 (Compiled frame)
>
>
> Thread t@52739: (state = BLOCKED)
>  - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
>  - java.lang.Object.wait() @bci=2, line=485 (Compiled frame)
>  - java.lang.ref.Reference$ReferenceHandler.run() @bci=46, line=116 (Compiled frame)
>
>
> Thread t@52995: (state = BLOCKED)
>  - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise)
>  - com.webobjects.appserver._WORunLoop._acceptInputBeforeDate(com.webobjects.foundation.NSTimestamp) @bci=98, line=244 (Interpreted frame)
>  - com.webobjects.appserver._WORunLoop.runBeforeDate(com.webobjects.foundation.NSTimestamp) @bci=39, line=95 (Interpreted frame)
>  - com.webobjects.appserver.WOApplication._runOnce() @bci=17, line=1095 (Interpreted frame)
>  - com.webobjects.appserver.WOApplication.run() @bci=106, line=1248 (Interpreted frame)
>  - com.webobjects.appserver.WOApplication.main(java.lang.String[], java.lang.Class) @bci=55, line=548 (Interpreted frame)
>  - net.paperfree.lightbeam.Application.main(java.lang.String[]) @bci=3, line=68 (Interpreted frame)
>  - sun.reflect.NativeMethodAccessorImpl.invoke0(java.lang.reflect.Method, java.lang.Object, java.lang.Object[]) @bci=0 (Interpreted frame)
>  - sun.reflect.NativeMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=87, line=39 (Interpreted frame)
>  - sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=6, line=25 (Interpreted frame)
>  - java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) @bci=161, line=597 (Interpreted frame)
>  - com.webobjects._bootstrap.WOBootstrap.main(java.lang.String[]) @bci=118, line=87 (Interpreted frame)
>
> Any help with this would be greatly appreciated.
>
> Greg
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