Pictures of a working garbage collector
Get `udb` - the reversible/time-traveling debugger from Undo. I don't own any stock - I love their product. You can run your code within it, hit an error, set a watch-point, reverse-continue to where the watch-point memory was changed and then check the stack. udb will turn brain-melting, blood-freezing memory bugs into trivial problems that you can solve in a few minutes.