Instruments show leak in main.m (Xcode 4.3.1)

Question

I am developing an app using ARC When profiling my app in instruments for memory leaks it shows leaks at the following function:

#import <UIKit/UIKit.h>

#import "AppDelegate.h"

int main(int argc, char *argv[])

{
    @autoreleasepool { 
       return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

Does this indicate a problem somewhere else in my code?

This is the stack trace

   0 libsystem_c.dylib malloc
   1 libsystem_c.dylib strdup
   2 libnotify_sim.dylib token_table_add
   3 libnotify_sim.dylib notify_register_mach_port
   4 libnotify_sim.dylib notify_register_dispatch
   5 CoreFoundation _CFXNotificationRegisterObserver
   6 CoreFoundation CFNotificationCenterAddObserver
   7 UIKit -[UIScrollView(Static) _startTimer:]
   8 UIKit -[UIScrollView _endPanWithEvent:]
   9 UIKit -[UIScrollView handlePan:]
  10 UIKit _UIGestureRecognizerSendActions
  11 UIKit -[UIGestureRecognizer _updateGestureWithEvent:]
  12 UIKit -[UIGestureRecognizer _delayedUpdateGesture]
  13 UIKit ___UIGestureRecognizerUpdate_block_invoke_0541



14 UIKit _UIGestureRecognizerApplyBlocksToArray
  15 UIKit _UIGestureRecognizerUpdate
  16 UIKit -[UIWindow _sendGesturesForEvent:]
  17 UIKit -[UIWindow sendEvent:]
  18 UIKit -[UIApplication sendEvent:]
  19 UIKit _UIApplicationHandleEvent
  20 GraphicsServices PurpleEventCallback
  21 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
  22 CoreFoundation __CFRunLoopDoSource1
  23 CoreFoundation __CFRunLoopRun
  24 CoreFoundation CFRunLoopRunSpecific
  25 CoreFoundation CFRunLoopRunInMode
  26 GraphicsServices GSEventRunModal
  27 GraphicsServices GSEventRun
  28 UIKit UIApplicationMain
  29 MyProject/main.m:16
  30 MyProject start

Answer 1

Your main.m looks different than others I have seen. Did you format it that way or was it done that way automatically? Here is an example from one of my ARC apps.

int main(int argc, char *argv[]) {

    @autoreleasepool {
        int retVal = UIApplicationMain(argc, argv, nil, nil);
        return retVal;
    }
}

Answer 2

I had this same problem while using ARC and it was caused by having the dealloc function in a view controller. By having the dealloc function (that didn't do anything in my case), the default behavior may not be called. Try commenting out all instances of dealloc and that should fix your problem.

Answer 3

It seems to be a bug in the iOS 5.1 framework: https://devforums.apple.com/message/630695