Steps to reproduce:
1. Download supplied project ("DD.zip").
2. Open Scene "Main".
3. Build Lighting.

Expected: no errors.
Actual: errors start to show up after some time.

Reproduced in: 2019.3.0a7

Notes:

Enlighten Errors:
'Final Gather' job failed with error code: 5 ('Failed reading Bake Direct Output System file.').
'Final Gather' job failed with error code: 6 ('Failed reading Bake Indirect Output System file.').
'Final Gather' job failed with error code: 4 ('Failed reading Bake Input System file.').
Failed executing external process for 'Final Gather' job.

Progressive GPU Errors:
[PathTracer] InitializeLightmapData job with hash: 7ce93aee86a1e53bc900c651a53369a5 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: e430062cb7a2ec811916e50739835c7a failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: 666da264a3ae79a952d1a40486d66b00 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: 29120fc05cb7dfd7105f5e4ee9bf94c3 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: 3c94ee2e6775f26b2f975ffebc0b748c failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: d8bcebd736c1dde8c18c92cea7f5ebed failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: cbbac6837e8839d98d52013aa98b3eff failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: 3b1bf2796f111f4b76cbdcffb22939e4 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: c1de5cd8c7ff66bbd4b2f6273b20e415 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: a171d4dba4739cb966daa4c1b70e33ed failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: bbf292f25bb6b677eeb48a19924abbae failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: b53dbbf517251b162b3ebd344def8450 failed with exit code 2.

Progressive CPU Errors:
[PathTracer] InitializeLightmapData job with hash: ae8b7fbcb3ac83ec56739a34dd6a4255 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: 2560a5abf77630513ed1e36e371452ac failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: 4410f56a24c1c9c4a47abdd5493298a8 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: 3b1bf2796f111f4b76cbdcffb22939e4 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: f2cc4c518087304fa3e1e509f9034943 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: 3d1296f54e03113bdfb9d9669b47e22e failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: 2b12fd728320474a1b0746868ef3a78d failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: d5fd6a08aba03ca5ee023fbc7fcadc5e failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: c1de5cd8c7ff66bbd4b2f6273b20e415 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: b53dbbf517251b162b3ebd344def8450 failed with exit code 2.
[PathTracer] InitializeLightmapData job with hash: b311cdad9419a16d8e79c3ff5eb90df9 failed with exit code 2.

Plenty of space in HDD
45% of RAM left during building