How to find the cause of a malloc “double free” error?

Question

I\'m programming an application in Objective-C and I\'m getting this error:

MyApp(2121,0xb0185000) malloc: *** error for object 0x1068310: double

Answer 1

Adding a symbolic breakpoint in Xcode 4

Just an update to make this relevant to Xcode 4...

From the Xcode 4 User Guide:

To add a symbolic breakpoint . . .

1. In the bottom-left corner of the breakpoint navigator, click the Add button.
2. Choose Add Symbolic Breakpoint.
3. Enter the symbol name in the Symbol field.
4. Click Done.