如何阅读这个iOS堆栈跟踪？

Question

我通常使用Javascript和Python等高级语言开发，所以在阅读较低级别的堆栈跟踪时，我并不是那么经验。我正在使用React Native构建iOS应用程序，我的应用程序有时会意外崩溃。阅读崩溃日志这是我得到的：

Incident Identifier: B03D5F95-EFD1-4FEB-AE18-C8EFEF273E53
CrashReporter Key:   6049c1cc93a2e0163265631aa6cc2fd30a1af6e7
Hardware Model:      iPhone7,2
Process:             MyApp [24268]
Path:                /private/var/containers/Bundle/Application/99B2B9A1-D266-4222-A083-84C4CFFCE182/MyApp.app/MyApp
Identifier:          org.mycompany.MyApp
Version:             1 (1.0)
Code Type:           ARM-64 (Native)
Role:                Non UI
Parent Process:      launchd [1]
Coalition:           org.mycompany.MyApp [3119]


Date/Time:           2019-03-04 14:20:18.4924 +0800
Launch Time:         2019-03-04 14:09:15.2536 +0800
OS Version:          iPhone OS 11.0.3 (15A432)
Baseband Version:    6.17.00
Report Version:      104

Exception Type:  EXC_CRASH (SIGKILL)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Termination Reason: Namespace <0xF>, Code 0x8badf00d
Triggered by Thread:  0

Filtered syslog:
None found

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libsystem_kernel.dylib          0x0000000180a60bc4 mach_msg_trap + 8
1   libsystem_kernel.dylib          0x0000000180a60a3c mach_msg + 72
2   BackBoardServices               0x00000001835d0de0 _BKSHIDGetCurrentDisplayBrightness + 112
3   BackBoardServices               0x00000001835de9cc BKSDisplayBrightnessGetCurrent + 32
4   FrontBoardServices              0x00000001835fffc0 -[FBSUIApplicationSystemService currentBacklightLevel] + 12
5   UIKit                           0x000000018a8a3d44 -[UIDevice _backlightLevel] + 44
6   UIKit                           0x000000018a8aced4 -[UIScreen _postBrightnessDidChangeNotificationIfAppropriate] + 168
7   CoreFoundation                  0x0000000180efa12c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 20
8   CoreFoundation                  0x0000000180efa090 ___CFXRegistrationPost_block_invoke + 64
9   CoreFoundation                  0x0000000180f1016c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 20
10  CoreFoundation                  0x0000000180f0fa3c __CFRunLoopDoBlocks + 288
11  CoreFoundation                  0x0000000180f0dca4 __CFRunLoopRun + 2436
12  CoreFoundation                  0x0000000180e2e2d8 CFRunLoopRunSpecific + 436
13  GraphicsServices                0x0000000182cbff84 GSEventRunModal + 100
14  UIKit                           0x000000018a3db880 UIApplicationMain + 208
15  MyApp                           0x00000001005833d4 main + 29652 (main.m:14)
16  libdyld.dylib                   0x000000018095256c start + 4

我如何/在哪里开始阅读崩溃日志？我相信它与mach_msg_trap有关但我无法找到任何关于它的东西。对于某些上下文，我的应用程序是一个跟踪用户地理定位与背景地理位置跟踪的应用程序。我无法弄清楚导致坠机的原因。

Answer 1

见TN2141: Understanding and Analyzing Application Crash Reports，其中说：

异常代码0x8badf00d表示应用程序已被iOS终止，因为发生了监视程序超时。应用程序花费太长时间来启动，终止或响应系统事件。 ...无论操作是什么，线程0都需要移动到后台线程，或者以不同方式处理，以便它不会阻塞主线程。

您是否正在做任何可能长时间阻塞主线程的事情？