Re: [Rubycocoa-talk] Bus error CFRelease on CGImageSourceRef - no clues?

[Duncan M. <du...@on...>]

On 6 Jul 2009, at 16:33, Patrick Geiller wrote:

>> Sorry to repost, but this has become a real blocker for me - I  
>> thought
>> I'd try one last time before giving up and re-coding in ObjC.
>>
>> I can't persuade RubyCocoa to CFRelease a CGImageSourceRef without a
>> bus error - as a result my PDF writing code is leaking like a sieve.
>
> Try adding some GC code, keeping references and nulling them after  
> release.
>
> GC.disable
>      imageSource =  
> CGImageSourceCreateWithURL(NSURL.fileURLWithPath('testdata/pot  
> pourri/blood.jpg'), nil)
>      image = CGImageSourceCreateImageAtIndex(imageSource, 0, nil)
>      CFRelease image
>      CFRelease imageSource
> image = imageSource = nil
> GC.enable
> GC.start
>
> Try that for each iteration, and if it works you might want to do it  
> only each 10 or 100 iterations.

I had played around with GC just after sending the mail. If I use the  
code as you've written, it segfaults after 2 iterations, without  
messing with GC, 726 iterations, or on app shutdown, whichever is  
sooner.

Looks to be a classic double-free, but with the irritating problem of  
a large memory leak if I leave it alone.

Does anyone know where I can report this as a bug. Is it Apple,  
SourceForge?

Cheers

Duncan