> > b) VIO_verb_cleanup() also can't use more than one instance 
> > of record buffer itself but it could call verb_post() 
> > while record buffer is already used:
> ....
> 
> VIO_verb_cleanup() can call itself recursively, but it seems that because it
> happens at the end of the function, it isn't important for this discussion.

    Exactly

> There was an unused param (new_rpb) that was deleted from the code in FB3,
> maybe it was incomplete code.

    It was not used at least since v1.0

Regards,
Vlad

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