iPhone crash on CoreData save

This is a different situation than this question, as the solution provided doesn't work and the stack is different.

Periodical crash when I save data using coredata.

The stack trace isn't 100% clear on where this is happening, but I'm certain it's this routine that's being called. It's either the save: in this method or the one following.

Code:

-(void)saveWine {
    if ([self validInfo]) {
        Wine *wine =  (Wine *)wineToEdit;
        if (wine == nil) {
            wine = (Wine *)[NSEntityDescription insertNewObjectForEntityForName:@"Wine" inManagedObjectContext:self.managedObjectContext];
        }
        wine.uuid = [Utils createUUID];
        wine.name = self.wineNameField.text;
        wine.vineyard = self.vineyardField.text;
        wine.vintage = [[self numberFormatter] numberFromString:self.vintageField.text];
        wine.timeStamp = [NSDate date];
        wine.rating = [NSNumber numberWithInt:self.ratingControl.selectedSegmentIndex];
        wine.partnerRating = [NSNumber numberWithInt:self.partnerRatingControl.selectedSegmentIndex];
        wine.varietal = self.currentVarietal;
        wine.tastingNotes = self.currentTastingNotes;
        wine.dateTasted = self.currentDateTasted;
        wine.tastingLocation = [[ReferenceDataAccessor defaultReferenceDataAccessor] addEntityForType:TASTING_LOCATION 
                                                                                             withName:self.currentWhereTasted];

        id type = [[ReferenceDataAccessor defaultReferenceDataAccessor] entityForType:WINE_TYPE 
                                                                          withOrdinal:self.typeControl.selectedSegmentIndex];
        wine.type = type;
        NSError *error;
        NSLog(@"Saving %@",wine);
        if (![self.managedObjectContext save:&error]) {
            [Utils showAlertMessage:@"There was a problem saving your wine; try restarting the app" withTitle:@"Problem saving"];
            NSLog(@"Error while saving new wine %@, %@", error, [error userInfo]);
        }
    }
    else {
        NSLog(@"ERROR - someone is calling saveWine with invalid info!!");
    }
}

Code for addEntityForType:withName::

-(id)addEntityForType:(NSString *)type withName:(NSString *)name {

    if ([Utils isStringBlank:name]) {
        return nil;
    }
    id existing = [[ReferenceDataAccessor defaultReferenceDataAccessor] entityForType:type withName:name];

    if (existing != nil) {
        NSLog(@"%@ with name %@ already exists",type,name);
        return existing;
    }


    NSManagedObject *newEntity = [NSEntityDescription insertNewObjectForEntityForName:type 
                                                               inManagedObjectContext:self.managedObjectContext];

    [newEntity setValue:name forKey:@"name"];

    NSError *error;
    if (![self.managedObjectContext save:&error]) {
        [Utils showAlertMessage:[NSString stringWithFormat:@"There was a problem saving a %@",type] withTitle:@"Database Probem"];
        [Utils logErrorFully:error forOperation:[NSString stringWithFormat:@"saving new %@",type ]];
    }
    return newEntity;
}

Stack trace:

Thread 0 Crashed:
0   libSystem.B.dylib               0x311de2d4 __kill + 8
1   libSystem.B.dylib               0x311de2c4 kill + 4
2   libSystem.B.dylib               0x311de2b6 raise + 10
3   libSystem.B.dylib               0x311f2d72 abort + 50
4   libstdc++.6.dylib               0x301dea20 __gnu_cxx::__verbose_terminate_handler() + 376
5   libobjc.A.dylib                 0x319a2594 _objc_terminate + 104
6   libstdc++.6.dylib               0x301dcdf2 __cxxabiv1::__terminate(void (*)()) + 46
7   libstdc++.6.dylib               0x301dce46 std::terminate() + 10
8   libstdc++.6.dylib               0x301dcf16 __cxa_throw + 78
9   libobjc.A.dylib                 0x319a14c4 objc_exception_throw + 64
10  CoreData                        0x3526e83e -[NSManagedObjectContext save:] + 1098
11  Wine Brain                      0x0000651e 0x1000 + 21790
12  Wine Brain                      0x0000525c 0x1000 + 16988
13  Wine Brain                      0x00004894 0x1000 + 14484
14  Wine Brain                      0x00008716 0x1000 + 30486
15  CoreFoundation                  0x31477fe6 -[NSObject(NSObject) performSelector:withObject:withObject:] + 18
16  UIKit                           0x338c14a6 -[UIApplication sendAction:to:from:forEvent:] + 78
17  UIKit                           0x3395c7ae -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 86
18  CoreFoundation                  0x31477fe6 -[NSObject(NSObject) performSelector:withObject:withObject:] + 18
19  UIKit                           0x338c14a6 -[UIApplication sendAction:to:from:forEvent:] + 78
20  UIKit                           0x338c1446 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26
21  UIKit                           0x338c1418 -[UIControl sendAction:to:forEvent:] + 32
22  UIKit                           0x338c116a -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 350
23  UIKit                           0x338c19c8 -[UIControl touchesEnded:withEvent:] + 336
24  UIKit                           0x338b734e -[UIWindow _sendTouchesForEvent:] + 362
25  UIKit                           0x338b6cc8 -[UIWindow sendEvent:] + 256
26  UIKit                           0x338a1fc0 -[UIApplication sendEvent:] + 292
27  UIKit                           0x338a1900 _UIApplicationHandleEvent + 5084
28  GraphicsServices                0x35d66efc PurpleEventCallback + 660
29  CoreFoundation                  0x314656f8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 20
30  CoreFoundation                  0x314656bc __CFRunLoopDoSource1 + 160
31  CoreFoundation                  0x31457f76 __CFRunLoopRun + 514
32  CoreFoundation                  0x31457c80 CFRunLoopRunSpecific + 224
33  CoreFoundation                  0x31457b88 CFRunLoopRunInMode + 52
34  GraphicsServices                0x35d664a4 GSEventRunModal + 108
35  GraphicsServices                0x35d66550 GSEventRun + 56
36  UIKit                           0x338d5322 -[UIApplication _run] + 406
37  UIKit                           0x338d2e8c UIApplicationMain + 664
38  Wine Brain                      0x000021ba 0x1000 + 4538
39  Wine Brain                      0x00002184 0x1000 + 4484

I have no idea why my app's memory locations aren't being symbolocated, but the code paths lead to only two manavedObjectContext save: calls. The time this happend, addEntityForType was called all the way through, creating a new object for the "whereTasted" entity, before the final save: on the entire wine object.

When I go through the same procedure again, it works fine. This leads me to believe it's something to do with the app having been run for a while when adding a new location, but I'm not sure.

Any thoughts on how I can debug this and get more info the next time this happens?

put @try - @catch around your save calls. There seems to be an exception thrown while saving:

9 libobjc.A.dylib 0x319a14c4 objc_exception_throw + 64

Sample:

@try
{
    if (![self.context save:&error]) {
        [[NSApplication sharedApplication] presentError:error];

}
@catch (NSException * e)
{
    NSLog(@"exception saving: %@", e);
    abort();
}