How to find where the app is crashing?

Below is the logs:

Crashed: com.apple.main-thread
EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x0000000c

0   libobjc.A.dylib 
objc_msgSend + 5
respondsToSelector:
1
CoreLocation    
(null) + 23946
2
CoreLocation    
(null) + 5230
3
CoreLocation    
(null) + 972
4
CoreFoundation  
__CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
5
CoreFoundation  
__CFRunLoopDoBlocks + 216
6
CoreFoundation  
__CFRunLoopRun + 1714
7
CoreFoundation  
CFRunLoopRunSpecific + 476
8
CoreFoundation  
CFRunLoopRunInMode + 106
9
GraphicsServices    
GSEventRunModal + 136
10  UIKit   
UIApplicationMain + 1440
11
Wines   
main.m line 40
main

On Mac you can find backtrace of your crashes in Console app under User Diagnostic Reports.

There you can find the crash file. Since your crash probably happens in your custom code, you probably sending some fishy values.

You cannot tell where the crash is happening, since your backtrace is stripped out. So either try to compile your code with the debug symbols, or use dtrace/dtruss to debug your app.

The objc_msgSend is a standard function of Objective-C.

Read also:

• objc_msgSend at ridiculousfish
• gcc/objc/objc-act.c at opensource apple