Question

I am trying to create a dangling pointer by using the following code:

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"I am touched!");

    // bar is an instance variable defined by  NSString *bar;  in the interface
    if (!bar) {
        NSLog(@"bar is being init");
        bar = [NSString stringWithFormat:@"Hello I am %i", arc4random() % 1000];
        NSLog(@"bar is now %@", bar);
    } else {
        NSLog(@"bar is %@", bar);
    }
}

So I can successfully crash the program on the second touch on an iPad 2 device (not Simulator), but then when I tried adding a [bar retain]; after the bar = assignment line to see that there will be no dangling pointer, the app cannot start and just keep on showing:

Couldn’t register com.mycompany.TryIOSAppLeak with the bootstrap
server. Error: unknown error code.

This generally means that another instance of this process was already
running or is hung in the debugger.(lldb)

Is there a way to make it start again? (besides rebooting the iPad and the iMac or restarting Xcode).

Answer 1

Ahh, this happens to me a lot. Try to force kill the app once it has a crash before you restart, the app is hung on the device. But once it happens delete the app on the device/simulator, restart the device/simulator and restart XCode. Very annoying right! Alternatively you could edit your scheme and change debugger to GDB. It has nothing to do with your code.