Steps to repro:
1. Open the attached project and 'AVP6_Desktop' scene;
2. In the Lighting window press 'Generate Lighting' button;
3. When the CL_OUT_OF_RESOURCES warning is shown in the Console close the Editor.

Expected result:
Editor is closed successfully.

Actual result:
Editor is stalled and cannot be closed. See the attached video and Editor.log file.

Notes:
- The issue is introduced in the lighting/radeonrays/export branch that will go to trunk soon;
- Reproducible only when baking with GPU Lightmapper, Optix denoiser and the AO texture export are enabled together;
- Reproducible when baking on GeForce GTX1070.