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Editorial Team
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Asked: 2026-06-10T19:43:34+00:00

Possible Duplicate: How do I set up NSZombieEnabled in Xcode 4? I am debugging

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Possible Duplicate:
How do I set up NSZombieEnabled in Xcode 4?

I am debugging an application and it throws an exec-bad-access error when performing a certain navigation function but only when i run it on a device. 

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0xf0000008
Crashed Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libobjc.A.dylib                 0x3421bf78 objc_msgSend + 16
1   UIKit                           0x31d9a28c -[UIWebView    webView:decidePolicyForNavigationAction:request:frame:decisionListener:] + 68
2   CoreFoundation                  0x321ce7dc __invoking___ + 60
3   CoreFoundation                  0x321297aa -[NSInvocation invoke] + 154
4   CoreFoundation                  0x321293c8 -[NSInvocation invokeWithTarget:] + 44
5   WebKit                          0x365f6e06 -[_WebSafeForwarder forwardInvocation:] + 246
6   CoreFoundation                  0x321cda7c ___forwarding___ + 660
7   CoreFoundation                  0x32128648 _CF_forwarding_prep_0 + 40
8   CoreFoundation                  0x321ce7dc __invoking___ + 60
9   CoreFoundation                  0x321297aa -[NSInvocation invoke] + 154
10  WebCore                         0x358fa1ee _ZL11SendMessageP12NSInvocation + 18
11  WebCore                         0x3590d6ea _ZL20HandleDelegateSourcePv + 74
12  CoreFoundation                  0x3219facc __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 8
13  CoreFoundation                  0x3219f298 __CFRunLoopDoSources0 + 208
14  CoreFoundation                  0x3219e03e __CFRunLoopRun + 646
15  CoreFoundation                  0x3212149e CFRunLoopRunSpecific + 294
16  CoreFoundation                  0x32121366 CFRunLoopRunInMode + 98
17  GraphicsServices                0x31278432 GSEventRunModal + 130
18  UIKit                           0x31c20cce UIApplicationMain + 1074
19  Parliament                      0x0007396a main (main.m:14)
20  Parliament                      0x00073928 start + 32

This is the error log. Would anyone know why this is or how i could debug errors such as this since running thruogh an instrument doesnt hep

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1 Answer

  1. Editorial Team

    You possibly have released an object and subsequently try to access that object in your webView:decidePolicyForNavigationAction delegate method.

    Enable “Zombie” detection in your debug build settings:
    How do I set up NSZombieEnabled in Xcode 4?

    This will help you identify if an object is not being properly retained.

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