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At the moment, gem_exec_gttfill fails with a sporadic EBUSY due to us wanting to unbind a pinned batch. Let's dump who first bound that vma to see if that helps us identify who still unexpectedly has it pinned. v2: We cannot allocate inside the printer (as it may be on an fs-reclaim path), so hope for the best and build the string on the stack v3: stack depth of 16 routinely overflows a 512 character string, limit it to 12 to avoid unsightly truncation. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180628132206.8329-1-chris@chris-wilson.co.uk