我使用Crashlytics来跟踪崩溃，我看到下面的堆栈跟踪发生了一些崩溃：
崩溃：com.apple.main-thread EXC_BAD_ACCESS KERN_INVALID_ADDRESS位于0xf8560b1c
Thread : Crashed: com.apple.main-thread
0 libobjc.A.dylib 0x37a20b66 objc_msgSend + 5
1 CoreFoundation 0x2d5f8e8d CFRelease + 560
2 QuartzCore 0x2fad2965 CA::release_objects(X::List<void const*>*) + 16
3 QuartzCore 0x2fad7dcf -[CAAnimation dealloc] + 54
4 libobjc.A.dylib 0x37a30b0b objc_object::sidetable_release(bool) + 174
5 CoreFoundation 0x2d5f8e8d CFRelease + 560
6 QuartzCore 0x2fada419 CA::Layer::run_animation_callbacks(void*) + 240
7 libdispatch.dylib 0x37f0a0af _dispatch_client_callout + 22
8 libdispatch.dylib 0x37f0c9a9 _dispatch_main_queue_callback_4CF + 268
9 CoreFoundation 0x2d6935b1 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
10 CoreFoundation 0x2d691e7d __CFRunLoopRun + 1308
11 CoreFoundation 0x2d5fc471 CFRunLoopRunSpecific + 524
12 CoreFoundation 0x2d5fc253 CFRunLoopRunInMode + 106
13 GraphicsServices 0x323362eb GSEventRunModal + 138
14 UIKit 0x2feb1845 UIApplicationMain + 1136
看起来CFRelease被调用某个对象两次。问题是我不知道哪个动画导致崩溃。日志不是很有用，因为崩溃发生在不同的地方。我如何调试/重现此崩溃或至少记录一些东西，以便我知道哪个对象被释放两次。