最近，我们发布的应用程序已经多次崩溃，堆栈跟踪包含的根本原因信息非常少。根据崩溃日志，崩溃发生在线程1中，但是这个线程只有两个调用。难道真正的问题仍然在主线程0？
有人能建议找到背景问题的最佳方法吗？
Hardware Model: iPhone6,2
Process: App [159]
Version: 0813 (1.3.2)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
Date/Time: 2014-08-16 16:51:48.114 +0200
OS Version: iOS 7.1.2 (11D257)
Report Version: 104
Exception Type: EXC_CRASH (SIGSEGV)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread: 1
Thread 0:
0 libobjc.A.dylib 0x00000001924901d0 objc_msgSend + 16
1 UIKit 0x0000000189026d94 -[UITableView _updateVisibleCellsNow:] + 1748
2 UIKit 0x0000000189026610 -[UITableView layoutSubviews] + 164
3 UIKit 0x0000000188f3afdc -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 344
4 QuartzCore 0x0000000188b2c254 -[CALayer layoutSublayers] + 180
5 QuartzCore 0x0000000188b26e1c CA::Layer::layout_if_needed(CA::Transaction*) + 296
6 QuartzCore 0x0000000188b26cd4 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 28
7 QuartzCore 0x0000000188b2655c CA::Context::commit_transaction(CA::Transaction*) + 276
8 QuartzCore 0x0000000188b26300 CA::Transaction::commit() + 420
9 QuartzCore 0x0000000188b1fc34 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 76
10 CoreFoundation 0x0000000185f37854 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 28
11 CoreFoundation 0x0000000185f34adc __CFRunLoopDoObservers + 368
12 CoreFoundation 0x0000000185e75df4 CFRunLoopRunSpecific + 488
13 GraphicsServices 0x000000018bb5dc08 GSEventRunModal + 164
14 UIKit 0x0000000188fa6fc0 UIApplicationMain + 1152
15 App 0x00000001000c8808 main (main.m:16)
16 libdyld.dylib 0x0000000192a73a9c start + 0
Thread 1 Crashed:
0 libsystem_kernel.dylib 0x0000000192b55aa8 kevent64 + 8
1 libdispatch.dylib 0x0000000192a59998 _dispatch_mgr_thread + 48
Thread 2 name: com.apple.NSURLConnectionLoader
Thread 2:
0 libsystem_kernel.dylib 0x0000000192b55ca0 mach_msg_trap + 8
1 CoreFoundation 0x0000000185f36d20 __CFRunLoopServiceMachPort + 180
2 CoreFoundation 0x0000000185f34eb0 __CFRunLoopRun + 832
3 CoreFoundation 0x0000000185e75dcc CFRunLoopRunSpecific + 448
4 Foundation 0x0000000186a6a424 +[NSURLConnection(Loader) _resourceLoadLoop:] + 344
5 Foundation 0x0000000186af8408 __NSThread__main__ + 996
6 libsystem_pthread.dylib 0x0000000192befe18 _pthread_body + 164
7 libsystem_pthread.dylib 0x0000000192befd70 _pthread_start + 13