Rejected iPhone app has strange crash logs - iphone

Question

My app was rejected from the app store due to a crash that produced the crash log below. What is even more strange than the crash is that the steps given to reproduce it don't happen to me or any of 10+ beta testers (on differing iOS devices). Can anyone help explain this more? I know the exception codes are some sort of memory thing, but is that the only reason that could cause this crash log? For instance, I don't even get a line number.
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x00000000, 0x00000000
Crashed Thread: 0
Thread 0 Crashed:
0 libSystem.B.dylib 0x33bd52d4 __kill + 8
1 libSystem.B.dylib 0x33bd52c4 kill + 4
2 libSystem.B.dylib 0x33bd52b6 raise + 10
3 libSystem.B.dylib 0x33be9d72 abort + 50
4 libstdc++.6.dylib 0x31bdba20 __gnu_cxx::__verbose_terminate_handler() + 376
5 libobjc.A.dylib 0x3347c594 _objc_terminate + 104
6 libstdc++.6.dylib 0x31bd9df2 __cxxabiv1::__terminate(void (*)()) + 46
7 libstdc++.6.dylib 0x31bd9e46 std::terminate() + 10
8 libstdc++.6.dylib 0x31bd9f16 __cxa_throw + 78
9 libobjc.A.dylib 0x3347b4c4 objc_exception_throw + 64
10 Foundation 0x33639910 __NSThreadPerformPerform + 648
11 CoreFoundation 0x33a767d6 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 6
12 CoreFoundation 0x33a485b0 __CFRunLoopDoSources0 + 376
13 CoreFoundation 0x33a47e54 __CFRunLoopRun + 224
14 CoreFoundation 0x33a47c80 CFRunLoopRunSpecific + 224
15 CoreFoundation 0x33a47b88 CFRunLoopRunInMode + 52
16 GraphicsServices 0x33b0e4a4 GSEventRunModal + 108
17 GraphicsServices 0x33b0e550 GSEventRun + 56
18 UIKit 0x32099322 -[UIApplication _run] + 406
19 UIKit 0x32096e8c UIApplicationMain + 664
20 AppName 0x00002172 main (main.m:14)
21 AppName 0x0000213c start + 32

Answer 1

Your code threw an un-handled exception somewhere or called abort() for some reason. It looks like it's happening in a dispatch to the main thread (so somewhere you are calling something like [obj performSelectorOnMainThread:#selector(something:) withObject:nil] or something similar. My best guess is that the selector you're choosing doesn't exist on the object (either due to memory management issues, like the object was replaced by something else) or due to some dynamic assignment you're doing.