iPhone：仅在ios4上，应用加载异常崩溃

Question

One of our games "iCopter Classic", which was once in the top selling list and has 100K unique users everyday, is getting bad comments from frustrated users.

The problem they keep reporting is, "The app, crashes on launch" on many ios4 devices, irrespective of the hardware they run on. We have tested the game on iPod Touch 2g, 3g, iPhone 2g, 3gs, 4 and with many iOS combinations. But we were not able to reproduce the problem.

Our download count went down to 50% because of this problem and bad comments for past 3 updates. We fixed all iOS 4 related code and now clueless of what to do next to fix this issue.

We somehow got crash reports from one of the users which we are not sure how to point the bug.

NOTE : My doubt is on this part of the code. We are loading around 200 images with separate uiimage objects for loading flags of countries.

Crash log says:

Exception Type: 00000020     
Exception Codes: 0x8badf00d

Answer 1

The first thing you need to chase up is the log file from the user, that will give you some useful information on what is going on.

You can symbolicate the crash log from your user (and get a readable call stack), by running the symbolicatecrash utility with the exact .dSYM that was generated when the application was first built:

symbolicatecrash -o .app.dSYM

SymbolicateCrash usually lives in:

/Developer/Platforms/iPhoneOS.platform/Developer/Library/PrivateFrameworks/DTDeviceKit.framework/Versions/A/Resources/symbolicatecrash