something strange when core data function [duplicate] - iphone

Question

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Core Data causing app to crash while migrating
(1 answer)
Why is App crashing when loading a pre populated DB into Core Data upon first open on Older Devices?
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Closed 9 years ago.
In my project, sometimes when call - (void)saveContext, the app crash, keep the screen locked, nothing could be done.
I found that in function - (void)saveContext below
- (void)saveContext
{
NSError *error = nil;
NSManagedObjectContext *managedObjectContext = _dataController.managedObjectContext;
if (managedObjectContext != nil) {
if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {
// Replace this implementation with code to handle the error appropriately.
// abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
abort();
}
else {
NSLog(#"save successful?");
}
}
if (error != nil) {
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
}
}
there is no output message. Core data's save function did not success and no failed error.
Why did that happen？Could somebody help me? Thanks!
crash report
Date/Time: 2013-10-03 18:05:31.016 +0800
OS Version: iOS 6.1.3 (10B329)
Report Version: 104
Exception Type: 00000020
Exception Codes: 0x000000008badf00d
Highlighted Thread: 0
Elapsed total CPU time (seconds): 11.020 (user 11.020, system 0.000), 55% CPU
Elapsed application CPU time (seconds): 9.389, 47% CPU
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libobjc.A.dylib 0x3b8745ac objc_msgSend + 12
1 CoreData 0x337f6bf4 -[NSSQLCore createAdapterOperationsForDatabaseOperation:] + 232
2 CoreData 0x337f88c0 -[NSSQLCore performChanges] + 184
3 CoreData 0x337f9a56 -[NSSQLCore saveChanges:] + 630
4 CoreData 0x3376022a -[NSSQLCore executeRequest:withContext:error:] + 506
5 CoreData 0x3375f4c4 -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 1300
6 CoreData 0x337b76de -[NSManagedObjectContext save:] + 726
7 LFeCatalogue 0x000ff130 -[AppDelegate saveContext] (AppDelegate.m:329)
8 LFeCatalogue 0x00152432 -[ECatalogueDataController alertView:clickedButtonAtIndex:] (ECatalogueDataController.m:2316)
9 UIKit 0x3591dc4c -[UIAlertView(Private) _buttonClicked:] + 292
10 UIKit 0x358b10c0 -[UIApplication sendAction:to:from:forEvent:] + 68
11 UIKit 0x358b1072 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26
12 UIKit 0x358b1050 -[UIControl sendAction:to:forEvent:] + 40
13 UIKit 0x358b0906 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 498
14 UIKit 0x358b0dfc -[UIControl touchesEnded:withEvent:] + 484
15 UIKit 0x357d95ec -[UIWindow _sendTouchesForEvent:] + 520
16 UIKit 0x357c67fc -[UIApplication sendEvent:] + 376
17 UIKit 0x357c6116 _UIApplicationHandleEvent + 6150
18 GraphicsServices 0x374d15a0 _PurpleEventCallback + 588
19 GraphicsServices 0x374d11ce PurpleEventCallback + 30
20 CoreFoundation 0x33993170 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32
21 CoreFoundation 0x33993112 __CFRunLoopDoSource1 + 134
22 CoreFoundation 0x33991f94 __CFRunLoopRun + 1380
23 CoreFoundation 0x33904eb8 CFRunLoopRunSpecific + 352
24 CoreFoundation 0x33904d44 CFRunLoopRunInMode + 100
25 GraphicsServices 0x374d02e6 GSEventRunModal + 70
26 UIKit 0x3581a2fc UIApplicationMain + 1116
27 LFeCatalogue 0x000fdc72 main (main.m:16)
28 libdyld.dylib 0x3bcb0b1c start + 0
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0 libsystem_kernel.dylib 0x3bd67648 kevent64 + 24
1 libdispatch.dylib 0x3bc97974 _dispatch_mgr_invoke + 792
2 libdispatch.dylib 0x3bc97654 _dispatch_mgr_thread$VARIANT$mp + 32
Thread 2 name: WebThread
Thread 2:
0 libsystem_kernel.dylib 0x3bd66eb4 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3bd67048 mach_msg + 36
2 CoreFoundation 0x33993040 __CFRunLoopServiceMachPort + 124
3 CoreFoundation 0x33991d9e __CFRunLoopRun + 878
4 CoreFoundation 0x33904eb8 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x33904d44 CFRunLoopRunInMode + 100
6 WebCore 0x3990b500 _ZL12RunWebThreadPv + 440
7 libsystem_c.dylib 0x3bcd030e _pthread_start + 306
8 libsystem_c.dylib 0x3bcd01d4 thread_start + 4
Thread 3 name: com.apple.NSURLConnectionLoader
Thread 3:
0 libsystem_kernel.dylib 0x3bd66eb4 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3bd67048 mach_msg + 36
2 CoreFoundation 0x33993040 __CFRunLoopServiceMachPort + 124
3 CoreFoundation 0x33991d9e __CFRunLoopRun + 878
4 CoreFoundation 0x33904eb8 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x33904d44 CFRunLoopRunInMode + 100
6 Foundation 0x342513d0 +[NSURLConnection(Loader) _resourceLoadLoop:] + 304
7 Foundation 0x342d4e80 __NSThread__main__ + 968
8 libsystem_c.dylib 0x3bcd030e _pthread_start + 306
9 libsystem_c.dylib 0x3bcd01d4 thread_start + 4
Thread 4 name: com.apple.CFSocket.private
Thread 4:
0 libsystem_kernel.dylib 0x3bd77594 __select + 20
1 CoreFoundation 0x339971f2 __CFSocketManager + 674
2 libsystem_c.dylib 0x3bcd030e _pthread_start + 306
3 libsystem_c.dylib 0x3bcd01d4 thread_start + 4
Thread 5:
0 libsystem_kernel.dylib 0x3bd77d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3bcc5cf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3bcc5a12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3bcc58a0 start_wqthread + 4
Thread 6:
0 libsystem_kernel.dylib 0x3bd77d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3bcc5cf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3bcc5a12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3bcc58a0 start_wqthread + 4
Unknown thread crashed with unknown flavor: 5, state_count: 1