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Re: CFZombieLevel

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Re: CFZombieLevel

Subject: Re: CFZombieLevel
From: Jakob Olesen <email@hidden>
Date: Fri, 22 Sep 2006 23:14:23 +0200

On 22/09/2006, at 21.26, Jim Correia wrote:

Unfortunately, CFZombieLevel is not going to be generally useful on current OS releases.

There are two problems I know about:

Problem #1 is now documented in the debugging magic technote.

http://developer.apple.com/technotes/tn2004/tn2124.html

	WARNING: CFZombieLevel is not currently compatible with custom
	allocators (created using CFAllocatorCreate) (r. 4158401). If you
	attempt this combination, your program will crash the first time you
	deallocate an object with a custom deallocator.

I thought that malloc_size() in __CFZombifyDeallocatedMemory() looked suspicious...

Problem #2 There appear to be issues with the custom CFObjects used by the security framework and how it manages them which make it unfriendly to CFZombie which are independent from problem #1.


I can add:

Problem #3 Setting CFZombieLevel will crash any program during startup if you are using a Japanese or Chinese input method.

I was able to find my bug by using a US keyboard layout during debugging.


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References:  
  >CFZombieLevel (From: Jakob Olesen <email@hidden>)
  >Re: CFZombieLevel (From: Jim Correia <email@hidden>)




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