Hi All, new VMs at http://www.mirandabanda.org/files/Cog/VM/VM.r2515/. These fix a code generator bug and as a result produce slightly better code in rare circumstances. Anyway, Hans' case below will no longer crash the VM :) Enjoy. On Thu, Nov 17, 2011 at 5:38 AM, Baveco, Hans <Hans.Baveco@wur.nl> wrote:

I managed to crash the (latest) cog VM consistently, producing the attached crash dump (containing two crashes). Debugging the code carefully I found that somewhere in the process of setting an instance variable of an object at the top of a tree-like structure, by traversing the tree downwards and back (lazy initializing instance variables), a clearly wrong method was executed:

setCenter: aPoint

center := center

after correcting this the crashes didn't occur anymore. Not sure how important this is, but surprising it was, though!

Hans

-- best, Eliot