Reproducible Cog crash but no info to get an idea...

To reproduce, take a Pharo 1.2 image and load the attached mcz.
You will see that method: #materializeKeysAndValuesTo:with:size:
has a "self halt" inside.

If you ran the test FLCreateClassSerializationTest >> testCreateWithMethod 
it will crash. If you remove the "self halt" from #materializeKeysAndValuesTo:with:size:    it works...

I debuged it with GDB and I don't know why, I can ONLY see the last two instrunctions, which is a longAt: -8
I attach screenshot. A bt or a call printAllStacks()  doesn't show me anything.

If I run from a console, the only thing I get is a:
Segmentation fault
Smalltalk stack dump:
Bus error

I have no idea what can be happening.  Thanks for any clue...

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Mariano
http://marianopeck.wordpress.com