Vray 6 suddenly crashing

[glennco]

note: see second update below, all is back to normal.

Hello,
What does this message mean, and can I use it to solve the crash?
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":50,"so urce":"V-Ray","msg":"[VUtils::PinnedGPUBuffer::uploadAsync] 718: Failed to upload buffer of size 4!","time":"2022-12-15T17:36:03.528Z","v":0}
There are about 2000 lines of that message, then Vray crashes & Rhino closes.
Model has been stable until yesterday, I made a days worth of changes.
There are 4 Rhino clipping planes for the room, associated with 4 saved views.
Each saved view rendered until recent additions to room.
2 of the views render fine, 2 crash.
Other projects/files render fine, only crashing here.
CUDA GPU & CPU
Thanks,
Glenn
Rhino 7 SR25 2022-11-22 (Rhino 7, 7.25.22326.19001
Vray 6 6.00.01 11/3/22
Vray core 6.00.21
"PTX max register count 128:128","time":"2022-12-15T17:36:01.381Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Building optimized CUDA kernel (3) for comp cap 7.5 for device 1...","time":"2022-12-15T17:36:01.381Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"PTX file generated with CUDA Toolkit v10.0 for CUDA compute capability 3.0.","time":"2022-12-15T17:36:01.382Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Optimized CUDA kernel assembled successfully","time":"2022-12-15T17:36:01.382Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Total memory for device 1 : 8191 MB, free 5851 MB","time":"2022-12-15T17:36:01.382Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Maximum kernel work group size: 1024","time":"2022-12-15T17:36:01.387Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Running RTEngine","time":"2022-12-15T17:36:01.387Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Using adaptive lights ver2","time":"2022-12-15T17:36:01.387Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"GPU adaptive dome light uploaded (0), flags=2","time":"2022-12-15T17:36:01.387Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Maximum kernel work group size: 1024","time":"2022-12-15T17:36:01.508Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Device[1]: NVIDIA GeForce RTX 2070 selected for GPU light cache calculations.","time":"2022-12-15T17:36:01.646Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Building GPU light cache.","time":"2022-12-15T17:36:01.646Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Tracing 1000000 image samples for light cache in 64 passes.","time":"2022-12-15T17:36:01.646Z","v":0}
{"name":"vray-neui","hostname":"Glenn","pid":1924,"level":30,"so urce":"V-Ray","msg":"Using 3.50 MB for light cache preview buffer","time":"2022-12-15T17:36:01.646Z","v":0}

Update
I remade an emissive material (plain white, no texture) as version 6 (was originally created in V5).
That material is in another part of the model, not shown in any of the 4 views/clips I am using today.
That has ended the crashes, but now these errors in VFB log:
(here is a partial)
Thanks,
Glenn
[11:55:41.331] Uploading texture "wine tile floor1.jpg" (idx=5) tile[0][0] at mip 5, 12x12, channels 3, 0KB
[11:55:41.359] Uploading texture "wood cedar brazil01.jpg" (idx=7) tile[0][0] at mip 1, 128x256, channels 3, 96KB
[11:55:41.471] Uploading texture "wallpaper1b.jpg" (idx=9) tile[0][0] at mip 0, 1000x725, channels 3, 2124KB
[11:55:41.643] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:41.643] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:41.643] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:41.748] Uploading texture "wine tile floor1.jpg" (idx=5) tile[0][0] at mip 4, 25x25, channels 3, 1KB
[11:55:41.783] Uploading texture "wine tile floor1.jpg" (idx=5) tile[0][0] at mip 1, 200x200, channels 3, 117KB
[11:55:41.894] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:41.894] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:41.894] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:42.098] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:42.098] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:42.098] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:42.174] Uploading texture "wine tile floor1.jpg" (idx=5) tile[0][0] at mip 0, 400x400, channels 3, 468KB
[11:55:42.330] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:42.331] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.
[11:55:42.332] Error : [GPULightCache::downloadGPULightCacheData] -1: Error during GPU Light Cache pass download.

SECOND Update
I updated Nvidia driver to current recommended 526.98, and no more log errors listed in last update.
So rendering as should be.
Thanks,
Glenn

[tsvetomira.girginova]

Thank you for sharing, Glenn!

Using the recommended GPU driver version is the best practice.
Contact us again if needed!

If someone is experiencing issues finding it, it's listed here: https://www.chaos.com/vray-gpu


Best regards,
TS

[Muhammed_Hamed]

Thank you for following up on your post glennco
I'm glad the issue is solved with a new driver

Best,
Muhammed