Question

On a device running ios 5 my app works great, but on a device running ios 4.2.1 i get this crash.
The strange thing is that the device crash only when NOT connected to xcode.
When run from xcode it work but when i run it without xcode the app is working till the moment i call the method:

- (void)startLocationUpdates
{
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
    self.locationManager.distanceFilter = 1;
    self.locationManager.delegate = self;
    [self.locationManager startUpdatingLocation];
} 

CRASH LOG:

OS Version:      iPhone OS 4.2.1 (8C148)
Report Version:  104

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x3830000f
Crashed Thread:  0

Thread 0 Crashed:
0   libobjc.A.dylib                 0x33479462 objc_msgSend + 14
1   CoreLocation                    0x34371430 -[CLLocationManager onClientEventLocation:] + 560
2   CoreLocation                    0x3436f68e -[CLLocationManager onClientEvent:supportInfo:] + 98
3   CoreLocation                    0x3436f804 OnClientEvent + 16
4   CoreLocation                    0x3436b522 CLClientInvokeCallback(__CLClient*, CLClientEvent, __CFDictionary const*) + 42
5   CoreLocation                    0x3436d3cc CLClientHandleDaemonDataLocation(__CLClient*, CLClientLocation const*, __CFDictionary const*) + 196
6   CoreLocation                    0x3436d512 CLClientHandleDaemonData(__CFMessagePort*, long, __CFData const*, void*) + 286
7   CoreFoundation                  0x33a813fe __CFMessagePortPerform + 242
8   CoreFoundation                  0x33a556f8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 20
9   CoreFoundation                  0x33a556bc __CFRunLoopDoSource1 + 160
10  CoreFoundation                  0x33a47f76 __CFRunLoopRun + 514
11  CoreFoundation                  0x33a47c80 CFRunLoopRunSpecific + 224
12  CoreFoundation                  0x33a47b88 CFRunLoopRunInMode + 52
13  GraphicsServices                0x33b0e4a4 GSEventRunModal + 108
14  GraphicsServices                0x33b0e550 GSEventRun + 56
15  UIKit                           0x32099322 -[UIApplication _run] + 406
16  UIKit                           0x32096e8c UIApplicationMain + 664
17  MyApp                       0x00002762 0x1000 + 5986
18  MyApp                       0x00002720 0x1000 + 5920

Answer 1

Are you sure that self is living all the time you use it and you set self.locationManager.delegate = nil; before you destroy self?