There are many threads around about crash reports in iOS and how to debug crashes but I thought I'd also post mine here as I haven't read a post that helps specifically to my case. I released my app to the AppStore a week or so ago and I have heard from a small number of people that their app is crashing. I cannot personally replicate the crashes (nor can they) on their app - although it appears to be when the user returns to the game after having not played it for a while (they cannot confirm whether they quit the app via double-clicking the home button or not, though).
So in my attempts to solve this I ran the game on my phone as well as the simulator, and I cannot replicate this at all - which makes the problem all the harder to work out. I thought I would post the pertinent parts of the crash report and see if anyone can make sense of it!
Incident Identifier: 52C3B61C-D05A-4F2D-91A0-0192A668FCBC Hardware Model: iPhone2,1 Process: Transfer Quiz  Path: /var/mobile/Applications/6BC39FBB-59F3-45A7-BD94-449914CFFFA8/Transfer Quiz.app/Transfer Quiz Identifier: Transfer Quiz Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd  Date/Time: 2012-08-29 16:49:03.080 +0100 OS Version: iPhone OS 5.1.1 (9B206) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0xc01236f2 Crashed Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libobjc.A.dylib 0x374faf7e objc_msgSend + 22 1 Transfer Quiz 0x000023c4 0x000013c4 2 Transfer Quiz 0x0000230c 0x0000130c 3 libdispatch.dylib 0x359dac52 _dispatch_call_block_and_release 4 libdispatch.dylib 0x359e5e8a _dispatch_main_queue_callback_4CF$VARIANT$up 5 CoreFoundation 0x311952a6 __CFRunLoopRun + 1262 6 CoreFoundation 0x3111849e CFRunLoopRunSpecific 7 CoreFoundation 0x31118366 CFRunLoopRunInMode 8 GraphicsServices 0x33192432 GSEventRunModal 9 UIKit 0x3087bcce UIApplicationMain 10 Transfer Quiz 0x000030d4 0x000020d4 11 Transfer Quiz 0x000021a8 0x000011a8
I am using ARC in my project, and the problem appears to be more pertinent to older devices (3GS) as opposed to newer models, which makes things more interesting.
If anyone has any suggestions, I would love to hear them.
PS - I enabled NSZombies in Xcode too, without any luck in finding anything (probably as I cannot replicate the crash!) - I couldn't find any memory leaks, either.
This might be related to your app getting cleared from memory while another app is running. This would also explain why it happens more often on older devices.
Put a log message into your
didReceiveMemoryWarning delegate methods, they will probably appear in your crash log as one of the last lines.
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