Hi martin 

the last release 11174 got the fix in (sorry for the delay).
Could you let us know if this is ok?

Stef



On Dec 31, 2009, at 4:17 AM, Martin McClure wrote:

> This one's pretty nasty.
> 
> Symptom:
> 
> The debugger in recent and current 1.1 images is completely broken.
> 
> To reproduce (save your image first!):
> 
> "self halt" doit. It goes into an infinite loop, and if there's a way to
> get out of that without killing the VM I'd like to know about it. Alt-.
> works, but just tries to open another debugger, which goes into another
> infinite loop, etc.
> 
> 
> 
> Cause:
> 
> DebuggerMethodMap>MapCache is a WeakIdentityKeyDictionary, but it is
> corrupt. It has an array of 22 nils, expired is 0, so it contains
> nothing, but tally=16.
> 
> This causes MapCache to lie about its size.
> 
> This drives DebuggerMethodMap class>>cacheDebugMap:forMethod: into an
> infinite loop, the whileTrue: condition is always true, it keeps trying
> to remove non-existent elements to get the size to be less than 16 but
> the size is always 16.
> 
> I don't see any obvious code paths to get into this state. I suspect it
> may have been left in this state when weak collections were updated with
> the new code not too long ago.
> 
> 
> Cure:
> 
> In an inspector, set tally=0. Debuggers then work again.
> 
> Not sure how to package this as a slice, so I'll leave the update to
> someone else, and get back to hashing, which was hard when every
> walkback froze my system :-)
> 
> 
> Regards,
> 
> -Martin
> 
> _______________________________________________
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> [email protected]
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