https://bugs.freedesktop.org/show_bug.cgi?id=62959

--- Comment #33 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #32)
> Attachment 77608 [details] fixes the lockups, which suggests the DRM driver
> doesn't actually flush caches when it should.

radeon_ring_vm_flush() doesn't actually flush caches per se, it writes the new
VM page table base address, so presumably we are not handling last_flush
properly somewhere which results in a stale VM page table pointer.

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