Re: Let's play "Spot the Deadlock" ;-)

Subject: Re: Let's play "Spot the Deadlock" ;-)
From: Chuck Hill <email@hidden>
Date: Wed, 7 Oct 2009 16:46:29 -0700

Ah geez, the Irish are at it again...  :-P


On Oct 7, 2009, at 1:06 PM, Kieran Kelleher wrote:

Here is an interesting deadlock I got today. I know some of you like to comment on deadlocks


You looking at me?

...... and I certainly appreciate it! BTW, I have concurrent off and Session deadlock detection on on that instance, so I am guessing this was an EOF lock. This app uses Wonder, ERXEC, safe autolocking, and Wonder EOF stack synchronization within instances, however there is only one common EOF stack for normal requests and EOF stacks are created occasionally for intensive background tasks.
Any comments on possible root cause and or troubleshooting tips?
I had a gazillion of stacks that were the same as the two under REMOVED STACKS below, so I have removed all those for readability:

REMOVED STACKS (I removed these ones that appearred multiple time from the jstack output for readability): Thread t@56835: (state = BLOCKED) - java.net.PlainSocketImpl.accept(java.net.SocketImpl) @bci=0, line=382 (Compiled frame; information may be imprecise) - java.net.ServerSocket.implAccept(java.net.Socket) @bci=50, line=450 (Interpreted frame) - java.net.ServerSocket.accept() @bci=48, line=421 (Interpreted frame) - com.webobjects.appserver._private.WOWorkerThread.run() @bci=26, line=238 (Compiled frame) - java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)


That is an idle(d) worker thread.

Thread t@72451: (state = BLOCKED) - com .webobjects .appserver ._private .WOComponentRequestHandler .handleRequest(com.webobjects.appserver.WORequest) @bci=21, line=432 (Interpreted frame) - com .webobjects .appserver .WOApplication.dispatchRequest(com.webobjects.appserver.WORequest) @bci=41, line=1306 (Compiled frame) - er .extensions .appserver .ERXApplication .dispatchRequestImmediately(com.webobjects.appserver.WORequest) @bci=74, line=1887 (Compiled frame) - er .extensions .appserver .ERXApplication.dispatchRequest(com.webobjects.appserver.WORequest) @bci=13, line=1852 (Compiled frame) - com.webobjects.appserver._private.WOWorkerThread.runOnce() @bci=729, line=173 (Compiled frame) - com.webobjects.appserver._private.WOWorkerThread.run() @bci=129, line=254 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)


That is blocked because you have concurrent off.

REMAINING STACKS (this is everything else):


I am deleting what is essentially the same as above.

Thread t@76291: (state = BLOCKED) - sun.misc.Unsafe.park(boolean, long) @bci=0 (Interpreted frame) - java.util.concurrent.locks.LockSupport.park() @bci=5, line=118 (Interpreted frame) - java.util.concurrent.locks.AbstractQueuedSynchronizer $ConditionObject.await() @bci=41, line=1841 (Interpreted frame) - java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=359 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=47, line=470 (Interpreted frame) - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=18, line=674 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)


Not sure, but that looks OK by itself.

Thread t@77059: (state = BLOCKED) - java.lang.Object.wait(long) @bci=0 (Interpreted frame) - java.lang.ref.ReferenceQueue.remove(long) @bci=44, line=120 (Compiled frame) - java.lang.ref.ReferenceQueue.remove() @bci=2, line=136 (Compiled frame) - org.apache.commons.httpclient.MultiThreadedHttpConnectionManager $ReferenceQueueThread.run() @bci=10, line=1122 (Interpreted frame)


Normal.

Thread t@77315: (state = BLOCKED) - java.lang.Thread.sleep(long) @bci=0 (Compiled frame; information may be imprecise) - au.com.forward.threads.ThreadReturn$1.run() @bci=3, line=391 (Compiled frame)


No idea.

Thread t@77571: (state = BLOCKED) - java.lang.Object.wait(long) @bci=0 (Interpreted frame) - org.apache.commons.httpclient.util.IdleConnectionTimeoutThread.run() @bci=49, line=108 (Interpreted frame)


Looks probably normal.

Thread t@78851: (state = BLOCKED) - java.lang.Object.wait(long) @bci=0 (Interpreted frame) - java.lang.Object.wait() @bci=2, line=474 (Interpreted frame) - java.util.TimerThread.mainLoop() @bci=28, line=483 (Interpreted frame) - java.util.TimerThread.run() @bci=1, line=462 (Interpreted frame)


Normal.

Thread t@79107: (state = BLOCKED) - java.lang.Object.wait(long) @bci=0 (Interpreted frame) - er.javamail.ERMailSender.run() @bci=26, line=276 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)


Normal.

Thread t@81411: (state = BLOCKED) - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise) - java.lang.Object.wait() @bci=2, line=474 (Compiled frame) - com.webobjects.eoaccess.EODatabaseContext.lock() @bci=56, line=1973 (Compiled frame)

Obviously affected (blocked). I an wondering why it is doing this now:

- com .webobjects .eocontrol .EOObjectStoreCoordinator .addCooperatingObjectStore (com.webobjects.eocontrol.EOCooperatingObjectStore) @bci=5, line=130 (Compiled frame) - com .webobjects .eoaccess .EODatabaseChannel .setCurrentEditingContext(com.webobjects.eocontrol.EOEditingContext) @bci=34, line=166 (Compiled frame) - com .webobjects .eoaccess .EODatabaseChannel ._selectWithFetchSpecificationEditingContext (com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=158, line=788 (Compiled frame) - com .webobjects .eoaccess .EODatabaseChannel .selectObjectsWithFetchSpecification (com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=64, line=215 (Compiled frame) - com .webobjects .eoaccess .EODatabaseContext ._objectsWithFetchSpecificationEditingContext (com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=219, line=3205 (Compiled frame) - com .webobjects .eoaccess .EODatabaseContext .objectsWithFetchSpecification (com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=34, line=3346 (Compiled frame) - com .webobjects .eocontrol .EOObjectStoreCoordinator .objectsWithFetchSpecification (com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=97, line=539 (Compiled frame) - com .webobjects .eocontrol .EOEditingContext .objectsWithFetchSpecification (com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=79, line=4114 (Compiled frame) - er .extensions .eof .ERXEC .objectsWithFetchSpecification (com.webobjects.eocontrol.EOFetchSpecification, com.webobjects.eocontrol.EOEditingContext) @bci=68, line=1189 (Compiled frame) - com .webobjects .eocontrol .EOEditingContext .objectsWithFetchSpecification (com.webobjects.eocontrol.EOFetchSpecification) @bci=3, line=4500 (Compiled frame) - wk.cheetah.eof.ProgramBehaviour $Utilities.hasAllTemplatesApprovedAndValid(wk.cheetah.eof.CTProgram) @bci=5, line=130 (Compiled frame) - wk.cheetah.eof.ProgramBehaviour $Utilities.doesRequireAttention(wk.cheetah.eof.CTProgram) @bci=15, line=120 (Compiled frame) - wk.cheetah.eof.JobsiteRadiusProgramBehaviour.doesRequireAttention() @bci=4, line=148 (Compiled frame) - wk.cheetah.eof.CTProgram.doesRequireAttention() @bci=4, line=425 (Compiled frame) - sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=6, line=25 (Compiled frame) - java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) @bci=111, line=585 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding$ValueAccessor $1.methodValue(java.lang.Object, java.lang.reflect.Method) @bci=3, line=684 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding $_MethodBinding.valueInObject(java.lang.Object) @bci=9, line=1160 (Compiled frame) - com .webobjects.eocontrol.EOCustomObject.valueForKey(java.lang.String) @bci=14, line=1559 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding $Utility.valueForKey(java.lang.Object, java.lang.String) @bci=26, line=498 (Compiled frame) - com.webobjects.foundation.NSKeyValueCodingAdditions $DefaultImplementation.valueForKeyPath(java.lang.Object, java.lang.String) @bci=19, line=212 (Compiled frame) - com .webobjects .eocontrol.EOCustomObject.valueForKeyPath(java.lang.String) @bci=2, line=1675 (Compiled frame) - com.webobjects.foundation.NSKeyValueCodingAdditions $Utility.valueForKeyPath(java.lang.Object, java.lang.String) @bci=26, line=149 (Compiled frame) - com .webobjects .eocontrol.EOKeyValueQualifier.evaluateWithObject(java.lang.Object) @bci=5, line=131 (Compiled frame) - com .webobjects .eocontrol .EOQualifier .filteredArrayWithQualifier(com.webobjects.foundation.NSArray, com.webobjects.eocontrol.EOQualifier) @bci=55, line=635 (Compiled frame) - wk.cheetah.eof.CTLocation.requiresAttentionPrograms() @bci=22, line=376 (Compiled frame) - sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=6, line=25 (Compiled frame) - java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) @bci=111, line=585 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding$ValueAccessor $1.methodValue(java.lang.Object, java.lang.reflect.Method) @bci=3, line=684 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding $_MethodBinding.valueInObject(java.lang.Object) @bci=9, line=1160 (Compiled frame) - com .webobjects.eocontrol.EOCustomObject.valueForKey(java.lang.String) @bci=14, line=1559 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding $Utility.valueForKey(java.lang.Object, java.lang.String) @bci=26, line=498 (Compiled frame) - com.webobjects.foundation.NSKeyValueCodingAdditions $DefaultImplementation.valueForKeyPath(java.lang.Object, java.lang.String) @bci=32, line=216 (Compiled frame) - com .webobjects .eocontrol.EOCustomObject.valueForKeyPath(java.lang.String) @bci=2, line=1675 (Compiled frame) - com.webobjects.foundation.NSKeyValueCodingAdditions $Utility.valueForKeyPath(java.lang.Object, java.lang.String) @bci=26, line=149 (Compiled frame) - com.webobjects.foundation.NSArray $_Operator._operationValue(java.lang.Object, java.lang.String) @bci=17, line=79 (Compiled frame) - com.webobjects.foundation.NSArray $_SumNumberOperator.compute(com.webobjects.foundation.NSArray, java.lang.String) @bci=3, line=46 (Compiled frame) - com .webobjects .foundation.NSArray._valueForKeyPathWithOperator(java.lang.String) @bci=71, line=744 (Compiled frame) - com.webobjects.foundation.NSArray.valueForKeyPath(java.lang.String) @bci=16, line=778 (Compiled frame) - com.webobjects.foundation.NSKeyValueCodingAdditions $Utility.valueForKeyPath(java.lang.Object, java.lang.String) @bci=26, line=149 (Compiled frame) - com.webobjects.foundation.NSKeyValueCodingAdditions $DefaultImplementation.valueForKeyPath(java.lang.Object, java.lang.String) @bci=52, line=217 (Compiled frame) - com .webobjects .eocontrol.EOCustomObject.valueForKeyPath(java.lang.String) @bci=2, line=1675 (Compiled frame) - com.webobjects.foundation.NSKeyValueCodingAdditions $Utility.valueForKeyPath(java.lang.Object, java.lang.String) @bci=26, line=149 (Compiled frame) - com.webobjects.foundation.NSKeyValueCodingAdditions $DefaultImplementation.valueForKeyPath(java.lang.Object, java.lang.String) @bci=52, line=217 (Compiled frame) - com .webobjects.appserver.WOComponent.valueForKeyPath(java.lang.String) @bci=2, line=1600 (Compiled frame) - com .webobjects.appserver.WOComponent.valueForBinding(java.lang.String) @bci=22, line=735 (Compiled frame) - sun.reflect.GeneratedMethodAccessor261.invoke(java.lang.Object, java.lang.Object[]) @bci=36 (Compiled frame) - sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=6, line=25 (Compiled frame) - java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) @bci=111, line=585 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding$ValueAccessor $1.methodValue(java.lang.Object, java.lang.reflect.Method) @bci=3, line=684 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding $_MethodBinding.valueInObject(java.lang.Object) @bci=9, line=1160 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding $DefaultImplementation.valueForKey(java.lang.Object, java.lang.String) @bci=34, line=1268 (Compiled frame) - com.webobjects.appserver.WOComponent.valueForKey(java.lang.String) @bci=2, line=1539 (Compiled frame) - com.webobjects.foundation.NSKeyValueCoding $Utility.valueForKey(java.lang.Object, java.lang.String) @bci=26, line=498 (Compiled frame) - com.webobjects.foundation.NSKeyValueCodingAdditions $DefaultImplementation.valueForKeyPath(java.lang.Object, java.lang.String) @bci=19, line=212 (Compiled frame) - com .webobjects.appserver.WOComponent.valueForKeyPath(java.lang.String) @bci=2, line=1600 (Compiled frame) - com .webobjects .appserver ._private .WOHTMLDynamicElement ._appendAttributesFromAssociationsToResponse (com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext, com.webobjects.foundation.NSDictionary) @bci=60, line=317 (Compiled frame) - com .webobjects .appserver ._private .WOGenericElement .appendAttributesToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=161, line=158 (Compiled frame) - com .webobjects .appserver ._private .WOGenericElement .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=60, line=181 (Compiled frame) - com .webobjects .appserver ._private .WOGenericContainer .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=3, line=29 (Compiled frame) - com .webobjects .appserver .WOComponent.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=56, line=992 (Compiled frame) - er .extensions .components .ERXComponent.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=26, line=107 (Compiled frame) - wk .webobjects .appserver .WKAbstractComponent .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=30, line=457 (Compiled frame) - com .webobjects .appserver ._private .WOComponentReference .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=11, line=111 (Compiled frame) - com .webobjects .appserver ._private .WODynamicGroup .appendChildrenToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=46, line=121 (Compiled frame) - er .extensions .components ._private .ERXWORepetition .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=90, line=508 (Compiled frame) - com .webobjects .appserver ._private .WODynamicGroup .appendChildrenToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=46, line=121 (Compiled frame) - com .webobjects .appserver ._private .WODynamicGroup .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=3, line=130 (Compiled frame) - com .webobjects .appserver ._private .WOComponentContent .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=36, line=43 (Compiled frame) - com .webobjects .appserver ._private .WODynamicGroup .appendChildrenToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=46, line=121 (Compiled frame) - com .webobjects .appserver ._private .WOGenericContainer .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=15, line=32 (Compiled frame) - com .webobjects .appserver ._private .WODynamicGroup .appendChildrenToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=46, line=121 (Compiled frame) - com .webobjects .appserver ._private .WODynamicGroup .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=3, line=130 (Compiled frame) - com .webobjects .appserver .WOComponent.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=56, line=992 (Compiled frame) - er .extensions .components .ERXComponent.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=26, line=107 (Compiled frame) - wk .webobjects .appserver .WKAbstractComponent .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=30, line=457 (Compiled frame) - wk .cheetah .wocomponents .PageWrapper.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=505, line=247 (Interpreted frame) - com .webobjects .appserver ._private .WOComponentReference .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=11, line=111 (Compiled frame) - com .webobjects .appserver ._private .WODynamicGroup .appendChildrenToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=46, line=121 (Compiled frame) - com .webobjects .appserver ._private .WODynamicGroup .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=3, line=130 (Compiled frame) - com .webobjects .appserver .WOComponent.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=56, line=992 (Compiled frame) - er .extensions .components .ERXComponent.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=26, line=107 (Compiled frame) - wk .webobjects .appserver .WKAbstractComponent .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=30, line=457 (Compiled frame) - wk .cheetah .wocomponents .Customers.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=7, line=349 (Interpreted frame) - com .webobjects .appserver .WOSession.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=30, line=1200 (Interpreted frame) - er .extensions .appserver .ERXSession.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=11, line=540 (Interpreted frame) - wk .webobjects .appserver .WKSession.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=33, line=176 (Interpreted frame) - wk .cheetah .Session.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=205, line=657 (Interpreted frame) - com .webobjects .appserver .WOApplication.appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=100, line=1418 (Interpreted frame) - er .extensions .appserver .ERXApplication .appendToResponse(com.webobjects.appserver.WOResponse, com.webobjects.appserver.WOContext) @bci=3, line=1789 (Interpreted frame) - com .webobjects .appserver ._private .WOComponentRequestHandler ._dispatchWithPreparedPage(com.webobjects.appserver.WOComponent, com.webobjects.appserver.WOSession, com.webobjects.appserver.WOContext, com.webobjects.foundation.NSDictionary) @bci=218, line=230 (Interpreted frame) - com .webobjects .appserver ._private .WOComponentRequestHandler ._dispatchWithPreparedSession(com.webobjects.appserver.WOSession, com.webobjects.appserver.WOContext, com.webobjects.foundation.NSDictionary) @bci=186, line=287 (Interpreted frame) - com .webobjects .appserver ._private .WOComponentRequestHandler ._dispatchWithPreparedApplication (com.webobjects.appserver.WOApplication, com.webobjects.appserver.WOContext, com.webobjects.foundation.NSDictionary) @bci=84, line=322 (Interpreted frame) - com .webobjects .appserver ._private .WOComponentRequestHandler ._handleRequest(com.webobjects.appserver.WORequest) @bci=109, line=358 (Interpreted frame) - com .webobjects .appserver ._private .WOComponentRequestHandler .handleRequest(com.webobjects.appserver.WORequest) @bci=23, line=432 (Interpreted frame) - com .webobjects .appserver .WOApplication.dispatchRequest(com.webobjects.appserver.WORequest) @bci=41, line=1306 (Compiled frame) - er .extensions .appserver .ERXApplication .dispatchRequestImmediately(com.webobjects.appserver.WORequest) @bci=74, line=1887 (Compiled frame) - er .extensions .appserver .ERXApplication.dispatchRequest(com.webobjects.appserver.WORequest) @bci=13, line=1852 (Compiled frame) - com.webobjects.appserver._private.WOWorkerThread.runOnce() @bci=729, line=173 (Compiled frame) - com.webobjects.appserver._private.WOWorkerThread.run() @bci=129, line=254 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)
Thread t@84483: (state = BLOCKED) - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise) - java.lang.Object.wait() @bci=2, line=474 (Compiled frame) - er.extensions.eof.ERXObjectStoreCoordinatorSynchronizer $ProcessChangesQueue.run() @bci=31, line=573 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)


Normal.

Thread t@84739: (state = BLOCKED) - java.lang.Thread.sleep(long) @bci=0 (Interpreted frame) - com.webobjects.appserver.WOApplication$_LifebeatThread.run() @bci=233, line=1233 (Interpreted frame)


Normal.

Thread t@84995: (state = BLOCKED) - java.lang.Thread.sleep(long) @bci=0 (Interpreted frame) - com.webobjects.appserver.WOSessionStore $_SessionTimeoutManager.run() @bci=16, line=110 (Interpreted frame) - java.lang.Thread.run() @bci=11, line=613 (Interpreted frame)

Normal.

Thread t@85507: (state = BLOCKED) - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise) - java.lang.Object.wait() @bci=2, line=474 (Compiled frame) - com.webobjects.eocontrol.EOObjectStoreCoordinator.lock() @bci=4, line=466 (Compiled frame) - com.webobjects.eocontrol.EOEditingContext.lockObjectStore() @bci=41, line=4735 (Compiled frame) - er.extensions.eof.ERXEC.lockObjectStore() @bci=7, line=668 (Compiled frame) - com.webobjects.eocontrol.EOEditingContext._dispose(boolean) @bci=181, line=1110 (Compiled frame) - com.webobjects.eocontrol.EOEditingContext.finalize() @bci=9, line=1178 (Interpreted frame) - er.extensions.eof.ERXEC.finalize() @bci=62, line=653 (Interpreted 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 (Interpreted frame)


Also affected, but seems normal otherwise.

Thread t@85763: (state = BLOCKED) - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be imprecise) - java.lang.Object.wait() @bci=2, line=474 (Compiled frame)


Is part of this missing?

Thread t@86019: (state = BLOCKED) - java.lang.Object.wait(long) @bci=0 (Interpreted frame) - com .webobjects .appserver ._WORunLoop ._acceptInputBeforeDate(com.webobjects.foundation.NSTimestamp) @bci=98, line=217 (Interpreted frame) - com .webobjects .appserver ._WORunLoop.runBeforeDate(com.webobjects.foundation.NSTimestamp) @bci=39, line=71 (Interpreted frame) - com.webobjects.appserver.WOApplication._runOnce() @bci=17, line=775 (Interpreted frame) - com.webobjects.appserver.WOApplication.run() @bci=99, line=900 (Interpreted frame) - er.extensions.appserver.ERXApplication.run() @bci=292, line=1225 (Interpreted frame) - com.webobjects.appserver.WOApplication.main(java.lang.String[], java.lang.Class) @bci=24, line=324 (Interpreted frame) - er.extensions.appserver.ERXApplication.main(java.lang.String[], java.lang.Class) @bci=6, line=716 (Interpreted frame) - wk.cheetah.Application.main(java.lang.String[]) @bci=3, line=88 (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=111, line=585 (Interpreted frame) - com.webobjects._bootstrap.WOBootstrap.main(java.lang.String[]) @bci=118, line=87 (Interpreted frame)

Normal.

So you have two threads both waiting on an OSC lock and no threads with an apparent OSC lock. That suggests that some other thread has locked the OSC, failed to unlock it, and gone off to do other things. Turn off your machine. Sell all of your possessions. Buy goats. Move to Nieue.

Barring that... it is possible that Anjo's changes are somehow involved, but I'd want more proof before I started suggesting that. More likely you are missing a try...finally block. Can you reproduce this in Eclipse? If so, you can stop it in the debugger and drill into the OSC to see what is holding the lock. Often that is enough information to isolate the offending code. If not, there is always goats on Nieue.

Chuck


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Chuck Hill             Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems. http://www.global-village.net/products/practical_webobjects

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