I usually develop in higher level languages like Javascript and Python , so I am not that experienced when it comes to reading lower level stack traces. I am building an iOS app with React Native and my app sometimes unexpectedly crashes. Reading the crash log this is what I get:
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
How/where do I begin reading thsi crash log? I believe it has something to do with mach_msg_trap but I haven't been able to find anything about it. For some context, my app is an app which tracks the users Geolocation with background geolocation tracking. I am unable to figure out what causes the crash.