**System Information**
Operating system: Linux-5.4.0-14-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce GTX 960/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.32.03
CPU: i7 3770
**Blender Version**
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2021-01-11 21:30, hash: `rBacbda123ad08`
**Short description of error**
When I render in Cycles with Sampling> Denoising> Render> Optix, strange things happen. The resulting render is left with empty tiles / holes and if you cancel (Esc) the render job you get the following error message:
```
CUDA_ERROR_ILLEGAL_ADDRESS in cuStreamSynchronize(cuda_stream[thread_index]) (device_optix.cpp:816)
```
{F9561290}
{F9561291}
Depending on the scene there may be more than one empty tile.