Re: Segfault in -[NSObject dealloc]

[Richard Frith-Macdonald]

On 18 May 2006, at 05:31, Michael Gardner wrote:

> I'm allocating objects with class_createInstance(), storing them on  
> a stack (well, just a plain NSArray), and popping them off at a  
> later time. When I pop an object from the stack, it gets released  
> (as I expect), but I get a segfault from -[NSObject dealloc] that I  
> can't track down.
>
> I'm pretty sure I'm not double-releasing the object since I've  
> sprinkled printf statements in my dealloc methods, and I've tried  
> looking through NSObject.m to find the culprit, but can't see where  
> the segfault is coming from (the inline functions hinder debugging  
> somewhat). What kind of things can cause segfaults in -[NSObject  
> dealloc]? Could this be a GNUstep bug?

You can't use class_createInstance() to create instances of GNUstep  
classes (unless you build NSObject.m in the base library specially to  
permit it).
The way to allocate OpenStep/GNUstep objects is using the  
NSAllocateObject() function.