DF5227: dirtied 2048KB va=fffff801189ac000 phys=0000000003000000, freeing...
DF5227: dma_alloc_coherent va=fffff801189ac000 dma=0000000003000000 (just-freed block phys=0000000003000000)  SAME PHYSICAL BLOCK
DF5227 RESULT: marker_hits=0 stale_nonzero_pages=0/512
DF5227 VERDICT: NOT reproduced (buffer was zero)