https://bugs.freedesktop.org/show_bug.cgi?id=45018
--- Comment #73 from Jerome Glisse glisse@freedesktop.org 2012-08-01 02:14:12 UTC --- Created attachment 65013 --> https://bugs.freedesktop.org/attachment.cgi?id=65013 Free va early in the kernel
Diagnosis was kind of obvious, but it just pop into my mind that ttm was sometimes delaying the deletion. So attached kernel patch should fix the issue without any mesa patch.