我收到了ptpd崩溃，如下所示。它在崩溃日志中随着我的设备日志中的应用程序崩溃，我认为它导致我的应用程序崩溃。知道这个ptpd崩溃是什么意思吗？什么是 PLManagedObjectContext
线程4名称：Dispatch queue：com.apple.PLManagedObjectContext.ChangeHub
线程4崩溃：
Incident Identifier: 1B7765B9-4717-4E1A-AD72-47DCB3618096
CrashReporter Key: 08c57bf283a25fa3cac64c3818d305cc9917ebab
Hardware Model: iPad4,2
Process: ptpd [8509]
Path: /usr/libexec/ptpd
Identifier: ptpd
Version: ???
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
Date/Time: 2015-03-10 14:57:04.610 +0000
Launch Time: 2015-03-10 14:40:32.704 +0000
OS Version: iOS 8.0.2 (12A405)
Report Version: 105
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread: 4
Last Exception Backtrace:
0 CoreFoundation 0x18343a084 __exceptionPreprocess + 132
1 libobjc.A.dylib 0x193e8c0e4 objc_exception_throw + 60
2 CoreFoundation 0x183439f44 +[NSException raise:format:arguments:] + 116
3 Foundation 0x1842b9fc0 -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:] + 88
4 PhotoLibraryServices 0x18e04d6ac __addContextToList_block_invoke + 488
5 libdispatch.dylib 0x1944d149c _dispatch_call_block_and_release + 24
6 libdispatch.dylib 0x1944d145c _dispatch_client_callout + 16
7 libdispatch.dylib 0x1944db554 _dispatch_queue_drain + 1216
8 libdispatch.dylib 0x1944d4564 _dispatch_queue_invoke + 132
9 libdispatch.dylib 0x1944dd224 _dispatch_root_queue_drain + 656
10 libdispatch.dylib 0x1944de75c _dispatch_worker_thread3 + 108
11 libsystem_pthread.dylib 0x1946ad2e4 _pthread_wqthread + 816
12 libsystem_pthread.dylib 0x1946acfa8 start_wqthread + 4
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libsystem_kernel.dylib 0x00000001945f8eb8 semaphore_wait_trap + 8
1 libsystem_platform.dylib 0x00000001946a59e0 _os_semaphore_wait + 20
2 libdispatch.dylib 0x00000001944da474 _dispatch_barrier_sync_f_slow + 516
3 CoreData 0x000000018318d464 -[NSManagedObjectContext performBlockAndWait:] + 216
4 CoreData 0x0000000183192f0c -[NSManagedObjectContext(NSEditorAndEditorRegistration) setName:] + 132
5 PhotoLibraryServices 0x000000018e03eef4 +[PLManagedObjectContext contextForPhotoLibrary:name:] + 304
6 PhotoLibraryServices 0x000000018dfbf054 -[PLPhotoLibrary loadDatabase:] + 608
7 PhotoLibraryServices 0x000000018dfb54ec -[PLPhotoLibrary initWithTransientContext:name:] + 552
8 PhotoLibraryServices 0x000000018e086cbc -[PLPTPdAssetManager photoLibrary] + 116
9 PhotoLibraryServices 0x000000018e0890c8 -[PLPTPdAssetManager(PictureTransferProtocol) libraryIsAvailable] + 20
10 ptpd 0x00000001000a7eac 0x100098000 + 65196
11 ptpd 0x00000001000b4748 0x100098000 + 116552
12 ptpd 0x000000010009b6a8 0x100098000 + 13992
13 ptpd 0x000000010009f0d0 0x100098000 + 28880
14 IOKit 0x000000018457dd14 IODispatchCalloutFromCFMessage + 264
15 CoreFoundation 0x00000001833dcf30 __CFMachPortPerform + 176
16 CoreFoundation 0x00000001833f1b34 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
17 CoreFoundation 0x00000001833f1a94 __CFRunLoopDoSource1 + 432
18 CoreFoundation 0x00000001833efa14 __CFRunLoopRun + 1636
19 CoreFoundation 0x000000018331d660 CFRunLoopRunSpecific + 392
20 ptpd 0x00000001000b464c 0x100098000 + 116300
21 ptpd 0x00000001000b51e0 0x100098000 + 119264
22 libdyld.dylib 0x00000001944faa04 start + 0
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0 libsystem_kernel.dylib 0x00000001945f8c94 kevent64 + 8
1 libdispatch.dylib 0x00000001944e097c _dispatch_mgr_invoke + 272
2 libdispatch.dylib 0x00000001944d34a0 _dispatch_mgr_thread + 48
Thread 2:
0 libsystem_kernel.dylib 0x00000001945f8e7c mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001945f8cf4 mach_msg + 68
2 CoreFoundation 0x00000001833f1804 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x00000001833ef758 __CFRunLoopRun + 936
4 CoreFoundation 0x000000018331d660 CFRunLoopRunSpecific + 392
5 CoreFoundation 0x000000018336f718 CFRunLoopRun + 108
6 ImageCapture 0x000000018ca95380 -[PTPTransport callbackThreadFunction] + 304
7 libsystem_pthread.dylib 0x00000001946afe7c _pthread_body + 160
8 libsystem_pthread.dylib 0x00000001946afdd8 _pthread_start + 156
9 libsystem_pthread.dylib 0x00000001946acfac thread_start + 0
Thread 3:
0 libsystem_kernel.dylib 0x0000000194613c78 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x00000001946ad390 _pthread_wqthread + 988
2 libsystem_pthread.dylib 0x00000001946acfa4 start_wqthread + 0
Thread 4 name: Dispatch queue: com.apple.PLManagedObjectContext.ChangeHub
Thread 4 Crashed:
0 libsystem_kernel.dylib 0x0000000194613270 __pthread_kill + 8
1 libsystem_pthread.dylib 0x00000001946b1224 pthread_kill + 108
2 libsystem_c.dylib 0x000000019458ab14 abort + 108
3 libc++abi.dylib 0x0000000193671414 abort_message + 112
4 libc++abi.dylib 0x0000000193690b88 default_terminate_handler() + 300
5 libobjc.A.dylib 0x0000000193e8c3bc _objc_terminate() + 124
6 libc++abi.dylib 0x000000019368dbb0 std::__terminate(void (*)()) + 12
7 libc++abi.dylib 0x000000019368d474 __cxa_throw + 132
8 libobjc.A.dylib 0x0000000193e8c200 objc_exception_throw + 344
9 CoreFoundation 0x0000000183439f40 +[NSException raise:format:arguments:] + 112
10 Foundation 0x00000001842b9fbc -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:] + 84
11 PhotoLibraryServices 0x000000018e04d6a8 __addContextToList_block_invoke + 484
12 libdispatch.dylib 0x00000001944d1498 _dispatch_call_block_and_release + 20
13 libdispatch.dylib 0x00000001944d1458 _dispatch_client_callout + 12
14 libdispatch.dylib 0x00000001944db550 _dispatch_queue_drain + 1212
15 libdispatch.dylib 0x00000001944d4560 _dispatch_queue_invoke + 128
16 libdispatch.dylib 0x00000001944dd220 _dispatch_root_queue_drain + 652
17 libdispatch.dylib 0x00000001944de758 _dispatch_worker_thread3 + 104
18 libsystem_pthread.dylib 0x00000001946ad2e0 _pthread_wqthread + 812
19 libsystem_pthread.dylib 0x00000001946acfa4 start_wqthread + 0
Thread 4 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x000000013f923d27
x4: 0x0000000193691dfd x5: 0x00000001024f2800 x6: 0x000000000000006e x7: 0x0000000000000f80
x8: 0x000000000c000000 x9: 0x0000000004000000 x10: 0x0000000000000200 x11: 0x0000000000000000
x12: 0x0000000000000000 x13: 0x0000000000000000 x14: 0x0000000000000002 x15: 0x0000000000000000
x16: 0x0000000000000148 x17: 0x0000000000000000 x18: 0x0000000000000000 x19: 0x0000000000000006
x20: 0x00000001024f4000 x21: 0x00000001981b9ce8 x22: 0x000000013f954d90 x23: 0x0000000197298000
x24: 0x0000000188393814 x25: 0x000000013f95af70 x26: 0x0000000000010001 x27: 0x00000001972a00fc
x28: 0x000000000000000f fp: 0x00000001024f2760 lr: 0x00000001946b1228
sp: 0x00000001024f2740 pc: 0x0000000194613270 cpsr: 0x00000000
答案 0 :(得分：1)
当我使用ALAssetsLibrary时，我遇到了这个问题。使用ARC时，我们无法确定ALAssetsLibrary对象是否存在故障。所以我们可以创建一个单独的ALAssetsLibrary对象来解决这个问题。您可以查看此https://stackoverflow.com/a/32693118/3103450。希望这对你有帮助:)）