Noobie Mistake while trying to traced memory leak with the app I am working on using the instrument provided by xcode , I got series of pink spikes,



and I'm not sure what was causing it, I thought that the managedObject Context was the culprit. I noticed tons of _NSZombie_ prefix listed and I remember that I added the NSZombieEnabled tag under the Argument in "Executable App Info",



I added NSZombieEnabled environment variable because it can be helpful to track down the elusive object causing the problem, mostly tracing the EXC_BAD_ACCESS error message. So after I disabled it, the app I am working on had no leak after all.