iOS 8 NSInternalInconsistencyException

Obtengo los siguientes informes de fallas. Solo ocurren en dispositivos con iOS 8. Observe el post:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'this request has been neutenetworking - you can't call -sendResponse: twice nor after encoding it' 

Informe del crash:

 Date/Time: 2014-08-31T01:39:15Z OS Version: iPhone OS 8.0 (12A4345d) Report Version: 104 Exception Type: SIGABRT Exception Codes: #0 at 0x1964cb270 Crashed Thread: 0 Application Specific Information: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'this request has been neutenetworking - you can't call -sendResponse: twice nor after encoding it' Last Exception Backtrace: 0 CoreFoundation 0x0000000186192084 CFDateGetTimeIntervalSinceDate + 19604 1 libobjc.A.dylib 0x0000000195d3c0e4 objc_exception_throw + 56 2 CoreFoundation 0x0000000186191f44 CFDateGetTimeIntervalSinceDate + 19280 3 Foundation 0x0000000187075e20 _NSSetExceptionRaiser + 340 4 BaseBoard 0x000000018c1deb90 BSMainScreenOrientation + 4856 5 libdispatch.dylib 0x000000019638d254 0x19638c000 + 4692 6 libdispatch.dylib 0x0000000196395d50 dispatch_barrier_sync_f + 1176 7 BaseBoard 0x000000018c1deae4 BSMainScreenOrientation + 4684 8 UIKit 0x000000018ac9df88 _UIBackdropViewSettingsColorCancelRed + 28984 9 libdispatch.dylib 0x000000019638d294 0x19638c000 + 4756 10 libdispatch.dylib 0x000000019638d254 0x19638c000 + 4692 11 libdispatch.dylib 0x000000019639103c _dispatch_main_queue_callback_4CF + 952 12 CoreFoundation 0x00000001861498dc CFRunLoopTimerSetTolerance + 4196 13 CoreFoundation 0x0000000186147984 _CFRunLoopGet2b + 3316 14 CoreFoundation 0x0000000186075664 CFRunLoopRunSpecific + 392 15 GraphicsServices 0x000000018f0a75a4 GSEventRunModal + 164 16 UIKit 0x000000018a82e164 UIApplicationMain + 1484 17 Taptalk 0x00000001000bfccc main (main.m:21) 18 libdyld.dylib 0x00000001963b2a08 _tlv_bootstrap + 232 

No puedo reproducirlo, pero parece que sucede al iniciar la aplicación desde el background. ¿Dónde debo comenzar a search?

El error estaba en la siguiente callback:

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler

El locking ocurre cuando llama a completionHandler dos veces. Esto sucede después de iOS8.