[Stackless] A new crash bug

[Christian Tismer]

Kristján Valur Jónsson wrote:
> Okay I have finally figured out what is happening.
> 
> The main tasklet is in garbage collection.  It has a list called "unreachable" and its head is on the stack.
> During colleection of the unreachable objects, we switch to a different tasklet.
> During that tasklet´s execution, some objects in "unreachable" are unlinked.  That is, final collection occurs there.
> However, "unreachable" is now in a different and invalid stack frame and so a memory corruption will occur.
> 
> The fix is to make "unreachable" a static variable.  This should be ok, since python threading model precludes more than one thread doing GC, and gc.collect() is not reentrant anyway.

Whow! Good boy!
Now that you say it, it is obvious. As always :-)

cheers - chris
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