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Editorial Team
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Asked: 2026-05-13T15:15:14+00:00

I am getting a (what seems to me as a strange) crash with Core

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I am getting a (what seems to me as a strange) crash with Core Data.
From what I can gather it is happening when Core Data does a save and subsequent managedObjectContextDidSave methods are fired.

I am at a loss and really hoping someone can help me out or guide me in the right direction.

The crash report is as follows:

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000b
Crashed Thread:  0

Thread 0 Crashed:
0   libobjc.A.dylib                 0x000026f4 objc_msgSend + 16
1   Foundation                      0x000437a4 NSClassFromObject + 8
2   Foundation                      0x0000ba54 _NSIMPForObjectAndSelector + 4
3   Foundation                      0x00095eae -[NSSortDescriptor compareObject:toObject:] + 110
4   CoreData                        0x000b0a6e +[NSFetchedResultsController(PrivateMethods) _insertIndexForObject:inArray:lowIdx:highIdx:sortDescriptors:] + 174
5   CoreData                        0x000b1496 -[NSFetchedResultsController(PrivateMethods) _postprocessInsertedObjects:] + 342
6   CoreData                        0x000b32d6 -[NSFetchedResultsController(PrivateMethods) _postprocessUpdatedObjects:] + 430
7   CoreData                        0x000b2a5e -[NSFetchedResultsController(PrivateMethods) _managedObjectContextDidChange:] + 498
8   Foundation                      0x0004bbf6 _nsnote_callback + 162
9   CoreFoundation                  0x00050af2 _CFXNotificationPostNotification + 298
10  Foundation                      0x000497f4 -[NSNotificationCenter postNotificationName:object:userInfo:] + 64
11  CoreData                        0x0002e42e -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:] + 66
12  CoreData                        0x0007fd26 -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:withDeletions:withUpdates:withRefreshes:] + 134
13  CoreData                        0x0001670a -[NSManagedObjectContext(_NSInternalChangeProcessing) _postRefreshedObjectsNotificationAndClearList] + 70
14  CoreData                        0x000164ac -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] + 1656
15  CoreData                        0x0004b5fa -[NSManagedObjectContext processPendingChanges] + 10
16  CoreData                        0x0003e2a4 _performRunLoopAction + 120
17  CoreFoundation                  0x0000fb50 __CFRunLoopDoObservers + 420
18  CoreFoundation                  0x00056a32 CFRunLoopRunSpecific + 1734
19  CoreFoundation                  0x00056356 CFRunLoopRunInMode + 42
20  GraphicsServices                0x00003cb8 GSEventRunModal + 108
21  GraphicsServices                0x00003d64 GSEventRun + 56
22  UIKit                           0x00002768 -[UIApplication _run] + 384
23  UIKit                           0x0000146c UIApplicationMain + 688
24  MyApp                           0x000022d2 main (main.m:14)
25  MyApp                           0x00002248 start + 44
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1 Answer

  1. Editorial Team

    It looks like one of the items in one of your database arrays is getting released one too many times (and therefore gets deallocated). It’s crashing trying to sort your array, making a comparison with a deallocated object.

    Try running your program with NSZombieEnabled — it prevents the deallocation so you can see which object is getting messages sent to it with a retain count of 0.

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