SIGABRT crash on __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ - iphone

Question

I have a SIGABRT crash log that is unfamiliar to me. Looks like it's throwing an exception, but I can't see where the exception is listed or the root cause of it.
This is running on a customer's iPad 2 / iOS 4.3.
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x33ed3a1c __pthread_kill + 8
1 libsystem_c.dylib 0x354d83b4 pthread_kill + 52
2 libsystem_c.dylib 0x354d0bf8 abort + 72
3 libstdc++.6.dylib 0x33671a64 __gnu_cxx::__verbose_terminate_handler() + 376
4 libobjc.A.dylib 0x3636906c _objc_terminate + 104
5 libstdc++.6.dylib 0x3366fe36 __cxxabiv1::__terminate(void (*)()) + 46
6 libstdc++.6.dylib 0x3366fe8a std::terminate() + 10
7 libstdc++.6.dylib 0x3366ff5a __cxa_throw + 78
8 libobjc.A.dylib 0x36367c84 objc_exception_throw + 64
9 Foundation 0x33f69924 __NSThreadPerformPerform + 648
10 CoreFoundation 0x33e4ba72 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 6
11 CoreFoundation 0x33e4d758 __CFRunLoopDoSources0 + 376
12 CoreFoundation 0x33e4e4e4 __CFRunLoopRun + 224
13 CoreFoundation 0x33ddeebc CFRunLoopRunSpecific + 224
14 CoreFoundation 0x33ddedc4 CFRunLoopRunInMode + 52
15 GraphicsServices 0x33544418 GSEventRunModal + 108
16 GraphicsServices 0x335444c4 GSEventRun + 56
17 UIKit 0x34416d62 -[UIApplication _run] + 398
18 UIKit 0x34414800 UIApplicationMain + 664
19 MyApp 0x000190c4 main (main.m:14)
20 MyApp 0x0001907c 0x18000 + 4220
Where would I start looking to diagnose this?

Answer 1

The program should print information about the exception to the device console (viewable in the Xcode organizer when the device is connected). It would be very, very helpful to see this information.
_NSThreadPerformPerform is used by the performSelector... family of methods. So look at your use of those methods. In particular, figure out if it's possible that you're asking an object to perform a selector that it doesn't support. That would throw an exception.