coldfusion threads within loops losing scope

I'm currently struggling to get to grips with threads. I have a feeling it might be to do with my scopes; however, I can't see where I am going wrong with this.

My CFC contains the function below:

<cfcomponent output="false" hint="thread stuff.">
    <cffunction name="threadTest" access="public" returntype="struct">
    <cfscript>
        local.lstOne            = "1,2,3,4,5,6";
        local.a                 = [];
        local.s                 = {};
        local.lst               = "";

        for(local.x = 1; local.x lte listlen(local.lstOne,','); local.x++){
            local.lst           &= (len(local.lst) gt 0) ? ',thr#local.x#' : 'thr#local.x#';

            thread action="run" name="thr#local.x#" nIndex="#local.x#" aArray="#local.a#"{

                thread.y        = attributes.nIndex;
                thread.aArray   = attributes.aArray;
                if(thread.y mod 2){
                    thread.c    = 1;
                } else {
                    thread.c    = 0;
                }

                thread.stArgs       = {};
                thread.stArgs.nMod  = thread.c;

                arrayAppend(thread.aArray, thread.stArgs);
            }
        }

        threadJoin(local.lst);

        local.s.counts          = local.a;

        return local.s;
    </cfscript>
</cffunction>
</cfcomponent>

and I have a CFM page that looks a little like this:

<cfscript>
theThread = createObject( "component", "ThreadStuff" ).init();
theThread.threadTest();
</cfscript>

When I run this, coldfusion comes back with the error Element X is undefined in LOCAL..

I can't work out why it is losing local.x after the first iteration of the loop (I have proven this by doing a dump at the beginning of the loop and at the end of the loop, and it can't get to local.x = 2).

where might I be going wrong?

Coldfusion 9.0.0 (version used in this question: 9,0,0,251028) has a bug where the local scope breaks when a thread is used within a loop within a function.

This issue is fixed in Coldfusion 9.0.1, see details here: http://helpx.adobe.com/coldfusion/kb/issues-fixed-coldfusion-9-0.html id:80153.