Your Mesa version is half a year old.
Please try a newer version of Mesa and/or with ACO enabled as well.
a) please clarify "freezes/crashes". Is this a GPU hang that requires you to reboot or not?
b) I cannot and will not debug the problem unless someone provides an apitrace or bisects the issue.
c) as Josh mentioned, please update your driver.
Where exactly did you open the spawn door? I can't reproduce this issue on Port Olisar at least.
Nothing extracted yet.