How to debug “message sent to deallocated instance” in Xcode4?

Question

I pressed ALT+CMD+R and activated NSZombieEnabled in Arguments > Environment Variables. Additionally, I activated it in Diagnostics > Memory Management > Enable Zombie Objec

Answer 1

In addition to Jeff's great answer; to do almost the same thing, but without having to open Instruments or profile your App, you can set NSZombieEnabled, MallocStackLogging, and guard malloc in the debugger. Then, when your App crashes, type this in the gdb console:

(gdb) info malloc-history 0x543216

Replace 0x543216 with the address of the object that caused the crash, and you will get a much more useful stack trace and it should help you pinpoint the exact line in your code that is causing the problem.

This article has some additional infoz.