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

  • Subject: Re: Let's play "Spot the Deadlock" ;-)
  • From: Kieran Kelleher <email@hidden>
  • Date: Thu, 8 Oct 2009 11:52:36 -0400

On Oct 7, 2009, at 7:46 PM, Chuck Hill wrote:

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

I guess we must do whatever we have to to engage the Canadians in a conversation :-)


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?

Yes, you, Anjo, Mike and all others who like WO challenges :-)




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:

And looking at that via jad makes me none the wiser either....

- 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@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?

No, that is the unaltered jstack output.



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.

LOL :-)


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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    • Re: Let's play "Spot the Deadlock" ;-)
      • From: Chuck Hill <email@hidden>
References: 
 >Let's play "Spot the Deadlock" ;-) (From: Kieran Kelleher <email@hidden>)
 >Re: Let's play "Spot the Deadlock" ;-) (From: Chuck Hill <email@hidden>)

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