Comment # 22 on bug 82455 from Michel Dänzer

(In reply to comment #21)
>     I am git newest mesa code, and change PAGE_SIZE alignment.

So my patch fixes the virtual address allocation failure?

>     I am closed all GPU DMA engine. R600_DMA=nodma.

That should be R600_DEBUG=nodma.

>     but the GPU CP is locked 

What did you try running when this happened?

>     This time the ring index is 3. it isa DMA_INDEX_RING 

Please attach the full dmesg from after the lockup.