Comment 9 for bug 1699484

INTEL_DEBUG=aub,buf gives the following log:

bo_unreference final: 9 (batchbuffer)
bo_create: buf 27 (batchbuffer) 32768b
drm_intel_gem_bo_purge_vma_cache: cached=5, open=9, limit=-1
bo_map: 27 (batchbuffer) -> 0x7fa3ab145000
Resized to 457x443
Resized to 454x441
bo_unreference final: 34 (prime)
drm_intel_gem_bo_purge_vma_cache: cached=6, open=8, limit=-1
drm_intel_gem_bo_purge_vma_cache: cached=7, open=7, limit=-1
 0: 10 (pipe_control workaround)
 1: 11 (program cache)
 2: 37 (prime)
 3: 33 (streamed data)
 4: 36 (miptree)
 5: 28 (batchbuffer)@0x00000000 0000001c -> 10 (pipe_control workaround)@0x00000000 7dc53000 + 0x00000004
 5: 28 (batchbuffer)@0x00000000 00000030 -> 28 (batchbuffer)@0x00000000 6e011000 + 0x00000001
 5: 28 (batchbuffer)@0x00000000 00000034 -> 28 (batchbuffer)@0x00000000 6e011000 + 0x00000001
 5: 28 (batchbuffer)@0x00000000 0000003c -> 11 (program cache)@0x00000000 0e232000 + 0x00000001
 5: 28 (batchbuffer)@0x00000000 000000a4 -> 28 (batchbuffer)@0x00000000 6e011000 + 0x00007fc0
 5: 28 (batchbuffer)@0x00000000 000000a8 -> 28 (batchbuffer)@0x00000000 6e011000 + 0x00007fe3
 5: 28 (batchbuffer)@0x00000000 000000b4 -> 28 (batchbuffer)@0x00000000 6e011000 + 0x00007fa0
 5: 28 (batchbuffer)@0x00000000 000000b8 -> 28 (batchbuffer)@0x00000000 6e011000 + 0x00007fbf
 5: 28 (batchbuffer)@0x00000000 00007e84 -> 37 (prime)@0x00000000 00000000 + 0x00000000
 5: 28 (batchbuffer)@0x00000000 00000290 -> 10 (pipe_control workaround)@0x00000000 7dc53000 + 0x00000004
 5: 28 (batchbuffer)@0x00000000 000002cc -> 10 (pipe_control workaround)@0x00000000 7dc53000 + 0x00000004
 5: 28 (batchbuffer)@0x00000000 00007c44 -> 37 (prime)@0x00000000 00000000 + 0x00000000
 5: 28 (batchbuffer)@0x00000000 00007c24 -> 1 (image)@0x00000000 00000000 + 0x00000000
 5: 28 (batchbuffer)@0x00000000 000004e0 -> 33 (streamed data)@0x00000000 00000000 + 0x00000000
 5: 28 (batchbuffer)@0x00000000 000004e4 -> 33 (streamed data)@0x00000000 00000000 + 0x00000051
 5: 28 (batchbuffer)@0x00000000 00000534 -> 10 (pipe_control workaround)@0x00000000 7dc53000 + 0x00000004
 5: 28 (batchbuffer)@0x00000000 00007a24 -> 36 (miptree)@0x00000000 6e001000 + 0x00000000
 5: 28 (batchbuffer)@0x00000000 0000069c -> 33 (streamed data)@0x00000000 00000000 + 0x00000050
 5: 28 (batchbuffer)@0x00000000 000006a0 -> 33 (streamed data)@0x00000000 00000000 + 0x000000a1
intel_do_flush_locked failed: No such file or directory