Xcode 4 memory problem

Start out by posting the code that is giving you the error.

 

Lots of open-source projects use Valgrind to find and fix memory-related problems. I'd imagine that closed-source projects make use of it too. The key to using it is integrating it into your build process, to find these bugs BEFORE they make it to release-level code. As for Memwatch, I've not heard of this tool before.

 

Too many conditions? like..

Code:

void foo(int x) {
    int *y = &x;
    for(y = 0; y < &x && *y == 1; y++) {
        (void) 0;
    }
}

Cause it runs fine (though it slowly) without the second compare.
But in trying to make it speed up, I cause EXEC_BAD_ACCESS...

Seriously though, if its repeatable every time, you're probably overflowing an array or something. Set break points earlier and earlier and just step through the code until your crash. You're probably dereferencing something you shouldn't, or overflowing an array due to poor control, or maybe having assignment when it should be comparison (= vs ==)