My iPhone app was recently rejected from the App Store "because it crashes on launch". However, I cannot reproduce this crash. The app works perfectly on both the simulator and a device with the same hardware and software Apple tested it on (iPhone 3.1 running iOS 4). The crash logs they sent me say "No Backtrace Available", so I have nowhere to look in my code. Here's an example:
Incident Identifier: [...]
CrashReporter Key: [...]
Hardware Model: iPhone3,1
Process: [MyApp] [1172]
Path: /var/mobile/Applications/[...]-3F1B-4504-A572-[...]/[MyApp].app/[MyApp]
Identifier: [MyApp]
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2010-07-08 [...]
OS Version: iPhone OS 4.0 (8A293)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0xfe42c648
Highlighted Thread: 0
Backtrace not available
Unknown thread crashed with ARM Thread State:
r0: 0x00002388 r1: 0x00000000 r2: 0x3e2b47c8 r3: 0x00000108
r4: 0x2fe00000 r5: 0x00000000 r6: 0x00000000 r7: 0x00000000
r8: 0x2ffffb48 r9: 0x2fffecfc r10: 0x00000000 r11: 0x00000000
ip: 0x00000010 sp: 0x2ffffb4c lr: 0x2fe08907 pc: 0xfe42c648
cpsr: 0x40000010
Binary Images:
0x1000 - 0x78fff +[MyApp] armv7 <23af3d265c3086eaceb51cc649eb794f> /var/mobile/Applications/[...]-3F1B-4504-A572-[...]/[MyApp].app/[MyApp]
0x2fe00000 - 0x2fe26fff dyld armv7 <697ae459733a7f0b6c439b21ba62b110> /usr/lib/dyld
[many more libraries...]
How can I begin debugging this? Is it possible this is a build issue rather than a coding bug? And can I extract any useful information from the "ARM Thread State" or the "Binary Images" portions of the crash report?
Thanks!
*update: * I have installed the app for the first time on another iPhone running iOS 4 and still cannot reproduce the crash. I'm beginning to think this is an issue with build-time parameters such as libraries or targeted versions. Based on the crash report, is it likely that any of my application's code was executed?
I was never able to reproduce the crash. I messed with a few build params and resubmitted and it was approved.