Core data + NSOperationQueue

[erritikamathur]

i have a subclass of NSOperation which have managedObject as one of its property.
I need to add multiple operation to nsoperationqueue & observe their finish.
For each NSOperation instance i created a new managed object as Apple documentation state "Create a separate managed object context for each thread and share a single persistent store coordinator.".
Once the first operation is finished i get following crash log

#0  0x34970c98 in objc_msgSend ()
#1  0x3608704e in -[_PFArray dealloc] ()
#2  0x36084b80 in -[_PFArray release] ()
#3  0x3179b1a0 in CFRelease ()
#4  0x3179deba in _CFAutoreleasePoolPop ()
#5  0x30d7bbb4 in NSPopAutoreleasePool ()
#6  0x30d91e1c in -[__NSOperationInternal start] ()
#7  0x30d91a7e in -[NSOperation start] ()
#8  0x30df7eca in ____startOperations_block_invoke_2 ()
#9  0x33a248e6 in _dispatch_call_block_and_release ()
#10 0x33a1a532 in _dispatch_worker_thread2 ()
#11 0x368bf590 in _pthread_wqthread ()
#12 0x368bfbc4 in start_wqthread ()

From logs it seems some object is getting over-release.How i can get which object is over-release?
App is run with NSZombieEnabled but only above info is received.
do the NsOperation maintain its own autorelease pool?

[dljeffery]

Originally Posted by erritikamathur

i have a subclass of NSOperation which have managedObject as one of its property.
I need to add multiple operation to nsoperationqueue & observe their finish.
For each NSOperation instance i created a new managed object as Apple documentation state "Create a separate managed object context for each thread and share a single persistent store coordinator."

Hard to tell without seeing any code, but at least in your description, you're mixing up your terminology. Managed Object != Managed Object Context.