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http://issues.apache.org/jira/browse/COCOON-1939?page=comments#action_12445359 
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Daniel Fagerstrom commented on COCOON-1939:
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The BlockContext wasn't pushed at the BlockCallStack when doing a polymorphic 
call through the block protocol, like block:/foo in your example, this made 
subsequent block protocol call be called relative to the wrong context of the 
super block A instead of relative the context of B.

Please check if it solves the problem for you.

> Stack overflow when inheriting from block that alread inherits from another 
> one
> -------------------------------------------------------------------------------
>
>                 Key: COCOON-1939
>                 URL: http://issues.apache.org/jira/browse/COCOON-1939
>             Project: Cocoon
>          Issue Type: Bug
>          Components: - Blocks Framework
>    Affects Versions: 2.2-dev (Current SVN)
>            Reporter: Alexander Klimetschek
>
> There are problems with the following scenario: I have one Block A, another 
> one B that has A as super-block defined and a third one C that has B as 
> super-block defined.
> The super-relation between B and A works ok, but if you start in C, then 
> forward to B, which in turn wants to forward to block A (all via the 
> block:super: protocol), a stack overflow happens. It looks like he always 
> thinks he is in C, so that block:super: from B will always get to B, thus 
> creating an endless loop.

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