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Editorial Team
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Asked: 2026-05-13T15:04:38+00:00

My iphone app occasionally crashes on the simulator and device with this message in

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My iphone app occasionally crashes on the simulator and device with this message in the debugger:

Program received signal:  “EXC_BAD_ACCESS”.
Data Formatters unavailable (Error calling dlopen for: "/Developer/Applications/Xcode.app/Contents/PlugIns/GDBMIDebugging.xcplugin/Contents/Resources/PBGDBIntrospectionSupport.A.dylib": "dlopen(/Developer/Applications/Xcode.app/Contents/PlugIns/GDBMIDebugging.xcplugin/Contents/Resources/PBGDBIntrospectionSupport.A.dylib, 10): no suitable image found.  Did find:
    /Developer/Applications/Xcode.app/Contents/PlugIns/GDBMIDebugging.xcplugin/Contents/Resources/PBGDBIntrospectionSupport.A.dylib: open() failed with errno=24")

The stack track just says:

0 (anonymous namespace)::emergency_mutex
1 ??
2 __NSFireTimer
3 CFRunLoopRunSPecific
4 CFRunLoopRunInMode
5 GSEventRunModal
6 GSEventRun
7 UIApplicationMain
8 main

I have no idea what that means or how to go about debugging it.

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1 Answer

  1. Editorial Team

    A major cause of EXEC_BAD_ACCESS is from trying to access over-released objects.

    To find out how to troubleshoot this, read this document: DebuggingAutoReleasePool

    Even if you don’t think you are “releasing auto-released objects”, this will apply to you.

    This method works extremely well. I use it all the time with great success!!

    In summary, this explains how to use Cocoa’s NSZombie debugging class and the command line “malloc_history” tool to find exactly what released object has been accessed in your code.

    Sidenote:

    Running Instruments and checking for leaks will not help troubleshoot EXEC_BAD_ACCESS. Memory leaks have nothing to do with EXEC_BAD_ACCESS. The definition of a leak is an object that you no longer have access to, and you therefore cannot call it (and cannot over-release it).

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