Double free invisible due to autorelease pool

Hi all,

I am currently in big trouble trying to find the cause of a "double 
free" which occurs when releasing an autorelease pool. Has anybody any 
idea to know how to identify where an autoreleased objects was freed 
(released, I guess) before being autoreleases ?

Malloc only gives me the object address, and of course not the object 
type. If you have got any trick or advice, it would be _greatly_ 
appreciated :)

TIA,

  -- Sébastien

--
«Le soleil est Dieu»
<http://www.type-z.org>             -- Turner, avant de mourir