How to debug EXC_BAD_ACCESS on iPhone

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If you set the NSZombieEnabled environment variable, the Objective C runtime will leave a dummy object behind for every deallocated object. When the zombie object is called, execution stops and you can see the message that was sent to the object and the call stack that tells you where the message came from it doesn’t tell you where you over released the object, but knowing where the object is called from should get you pretty close to the problem.

via codza » how to debug EXC_BAD_ACCESS on iPhone.