Crash with MapKit on iOS 6 - iphone

Question

I have not been able to reproduce this particular crash myself but it has been reported via our crash reporting tool and is being experienced by several hundred of our users. Finding it hard to debug or reproduce.
It happens on all hardware platforms but only on iOS 6. Any help or insights will be highly appreciated.
Exception Type:SIGSEGVCode:SEGV_ACCERR
Fatal Exception
Thread 0 Crashed
0 MapKit _remove(objc_object*, MKQuadTrieNode*) + 13
1 MapKit -[MKQuadTrie remove:] + 54
2 MapKit -[MKAnnotationContainerView observeValueForKeyPath:ofObject:change:context:] + 252
3 Foundation NSKeyValueNotifyObserver + 272
4 Foundation NSKeyValueWillChange + 572
5 Foundation -[NSObject(NSKeyValueObserverNotification) willChangeValueForKey:] + 180
6 Foundation NSKVOForwardInvocation + 130
7 CoreFoundation ___forwarding___ + 626
8 CoreFoundation _CF_forwarding_prep_0 + 24
9 MapKit -[MKUserLocation _updateCoordinate] + 106
10 MapKit -[MKUserLocation setLocation:] + 106
11 MapKit -[MKMapView(UserPositioningInternal) locationManagerUpdatedLocation:] + 994
12 CoreFoundation -[NSArray makeObjectsPerformSelector:withObject:] + 206
13 MapKit -[MKLocationManager _reportLocationStatus:] + 66
14 MapKit -[MKLocationManager locationProvider:didUpdateLocation:] + 1540
15 MapKit -[MKCoreLocationProvider locationManager:didUpdateLocations:] + 864
16 CoreLocation -[CLLocationManager onClientEventLocation:] + 1614
17 CoreLocation __CLClientInvokeCallback_block_invoke_0 + 64
18 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
19 CoreFoundation __CFRunLoopDoBlocks + 160
20 CoreFoundation __CFRunLoopRun + 1450
21 CoreFoundation CFRunLoopRunSpecific + 356
22 CoreFoundation CFRunLoopRunInMode + 104
23 GraphicsServices GSEventRunModal + 74
24 UIKit UIApplicationMain + 1120
25 App Name main.m line 14 main + 14

Answer 1

Try setting the delegate method of the locationManager to nil in the dealloc method of the class you are using it in
Something like this:
-(void) dealloc
{
self.locationManager.delegate = nil;
}
What might be happening is that the object is being deallocated (maybe due to low memory) and the location manager is trying to send a message to a non existing delegate.