Cocoa app crashes with EXC_BAD_ACCESS, but only on Mac OS X 10.6.6

Question

I received a couple of crash reports from users running Mac OS X 10.6.6. My app crashes with the error below:

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000060443800
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Application Specific Information:
objc_msgSend() selector name: release


Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   libobjc.A.dylib                0x97d98edb objc_msgSend + 27
1   com.apple.LaunchServices       0x9038dc62 __LSSharedFileListItemDeallocate + 126
2   com.apple.CoreFoundation       0x9489d101 _CFRelease + 353
3   com.apple.CoreFoundation       0x948c75b2 __CFArrayReleaseValues + 210
4   com.apple.CoreFoundation       0x9489d101 _CFRelease + 353
5   ...myapp.AppName 0x00005d67 +[ABTools isLoginItem] + 1597

The code that breaks is trying to determine if the application has installed a login item. The 3rd to last line releasing the array fails (on 10.6.6, works on 10.5.8).

Can anybody see why that would happen? I looked at that code for way too long and I don't see it.

Thanks! Mark

+ (BOOL) isLoginItem {

    BOOL isLoginItem = NO;

    UInt32 seedValue;

    NSString *appName = [NSString stringWithFormat:@"%@.app", [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleName"]];
    NSString *appPath = [[NSBundle mainBundle] bundlePath];

    LSSharedFileListRef loginItems = LSSharedFileListCreate(NULL,kLSSharedFileListSessionLoginItems,NULL);
    if (!loginItems) {
        return isLoginItem;
    }
    CFURLRef url = (CFURLRef)[NSURL fileURLWithPath:appPath];

    NSArray *loginItemsArray = (NSArray *)LSSharedFileListCopySnapshot(loginItems, &seedValue);

    if (!loginItemsArray) {
        return isLoginItem;
    }
    for (id item in loginItemsArray)
    {  
        if (LSSharedFileListItemResolve((LSSharedFileListItemRef)item,0,(CFURLRef*)&url,NULL) == noErr
            && [[(NSURL *)url path] isEqualToString:appPath]) {

            isLoginItem = YES;
        }
        if (url) CFRelease(url);
    }

    if (loginItemsArray) [loginItemsArray release]; // THIS FAILS ON Mac OS X 10.6.6
    if (loginItems) CFRelease(loginItems);

    return isLoginItem;
}

Answer 1

Not sure about the problem that you are having, but I have used this code for my app and it is working perfectly Enabling launch on startup

Answer 2

In general, changes in .x.y releases should not cause previously working apps to crash. I suggest you file a bug at bugreport.apple.com.