Question

I’m working on an iPad application I recovered from a previous developer. Sometimes I get the following message :

Received memory warning.
applicationDidReceiveMemoryWarning:
[ResultsListViewController respondsToSelector:]: message sent to deallocated instance 0x2b1c70

and the app stopped at

int main(int argc, char *argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

I understood that, after the application received a memory warning, the application is trying to execute a function from a class that was already deallocated. The problem is, as I said, I didn’t developed the application, so I could not find where the problem occurred, even with the NSZombies enabled.

Is there a way to retrieve where the issue occurred, using LLDB (or any other way) with the object memory address (in my case 0x2b1c70)?

Answer 1

Use a symbolic breakpoint, this tutorial shows you how to use them: http://iosdevelopertips.com/debugging/tracking-down-exception-errors.html

Hope this helps!

Sam