The locking problem is solved, my original analysis was incorrect. The problem was that DRM_CAS was not correctly implemented on IA64. Thus this was an IA64 issue only, this is consistent with others who showed up in a google search describing the problem, all were on IA64.
I have filed an XFree86 bug report on this. I could not find a DRI specific bug reporting mechanism other than the dri-devel list.
This list is good. Can you put together a patch to correct the behaviour?
Keith
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