Unable to understand where MyApp is crashing

Question

My App is crashing in some scenarios. Unable to find the reason & place of crash.

Below is crash log (iPad/iOS 8.0.2).

Hardware Model:      iPad2,5
OS Version:          iOS 8.0.2 (12A405)
Report Version:      105

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread:  0
Thread 0 Crashed:
0   libsystem_kernel.dylib          0x306b3dfc __pthread_kill + 8
1   libsystem_pthread.dylib         0x30733d0e pthread_kill + 58
2   libsystem_c.dylib               0x30653934 abort + 72
3   libc++abi.dylib                 0x2f864bb8 abort_message + 84
4   libc++abi.dylib                 0x2f87e66a default_terminate_handler() + 262
5   libobjc.A.dylib                     0x30052f0e _objc_terminate() + 190
6   libc++abi.dylib                 0x2f87bdec std::__terminate(void (*)()) + 76
7   libc++abi.dylib                 0x2f87b5ac __cxa_throw + 108
8   libobjc.A.dylib                     0x30052d46 objc_exception_throw + 246
9   CoreFoundation                  0x225dfe58 +[NSException raise:format:arguments:] + 100
10  Foundation                      0x232af2c4 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 88
11  BaseBoard                       0x270a08d8 __25-[BSAction sendResponse:]_block_invoke + 140
12  libdispatch.dylib               0x305bc99c _dispatch_barrier_sync_f_invoke + 44
13  BaseBoard                       0x270a0842 -[BSAction sendResponse:] + 98
14  UIKit                               0x25fd54d0 -[UIFetchContentInBackgroundAction sendResponse:] + 212
15  libdispatch.dylib               0x305b3610 _dispatch_call_block_and_release + 8
16  libdispatch.dylib               0x305b35fc _dispatch_client_callout + 20
17  libdispatch.dylib               0x305be2b2 _dispatch_main_queue_callback_4CF$VARIANT$mp + 714
18  CoreFoundation                  0x225a5e5c __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 4
19  CoreFoundation                  0x225a457c __CFRunLoopRun + 1508
20  CoreFoundation                  0x224f1dac CFRunLoopRunSpecific + 472
21  CoreFoundation                  0x224f1bbe CFRunLoopRunInMode + 102
22  GraphicsServices                0x2985404c GSEventRunModal + 132
23  UIKit                               0x25abda2c UIApplicationMain + 1436
24  MyApp                               0x000fb9f2 main (main.m:15)
25  libdyld.dylib                       0x305eeaac start + 0

Thanks in advance..

Answer 1

The exception message that corresponds to the stack trace is:

"this request has been neutered - you can't call -sendResponse: twice nor after encoding it"

While it's not possible to tell for sure from the stack alone, you most likely called the completionHandler passed to your app delegate's -application:performFetchWithCompletionHandler: method twice.