iphone - 使用偏好(NSUserDefaults)崩溃？

Question

我时不时遇到崩溃，我所知道的不是我启动的线程，其中提到了CFXPreferencesPropertyListSourceSynchronizer和CFXPreferencesPropertyListSource。
我确实有访问NSUserDefaults的单独线程。 (NSUserDefaults应该是线程安全的。)有人认识到这里出了什么问题吗？

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x444e4128
Crashed Thread:  5

Thread 5 name:  Dispatch queue: CFPreferences Background Sync Queue
Thread 5 Crashed:
0   libobjc.A.dylib                 0x34ec4f78 objc_msgSend + 16
1   CoreFoundation                  0x3710de90 CFRetain + 76
2   CoreFoundation                  0x3718aa96 __CFDictionaryStandardRetainValue + 62
3   CoreFoundation                  0x37114fe0 CFBasicHashCreateCopy + 832
4   CoreFoundation                  0x37124f50 CFDictionaryCreateMutableCopy + 388
5   CoreFoundation                  0x3712d340 -[CFXPreferencesPropertyListSourceSynchronizer initWithPropertyListSource:forLockedSynchronize:] + 232
6   CoreFoundation                  0x371b4800 __79-[CFXPreferencesPropertyListSource synchronizeInBackgroundWithCompletionBlock:]_block_invoke_0 + 56
7   libdispatch.dylib               0x302e5c52 _dispatch_call_block_and_release + 6
8   libdispatch.dylib               0x302f0ca4 _dispatch_queue_drain + 268
9   libdispatch.dylib               0x302f0b12 _dispatch_queue_invoke$VARIANT$up + 30
10  libdispatch.dylib               0x302f1784 _dispatch_worker_thread2 + 208
11  libsystem_c.dylib               0x33a34df4 _pthread_wqthread + 288
12  libsystem_c.dylib               0x33a34cc8 start_wqthread + 0

Answer 1

它在CFRetain上崩溃，所以我最好的猜测是您已经释放了一些键或某个值，或者您使用非对象作为键或值。