Hi.

I'm running in to an issue where VirtualGL works flawlessly for a while 
after booting the system, but then develops problems after a short time (5 
mins or so). Using glxgears as an example, these problems manifests as 
either a black window or corrupted images being displayed by the client. 
nvidia-smi shows glxgears running on the GPU whilst the black/corrupted 
window is shown, though the framerate reported by glxgears is very low 
(~0.3FPS). Other applications also initially run perfectly, but then fail 
to start or show corrupted graphics a few minutes following boot.

My configuration:
- CentOS 7
- Nvidia Quadro P2000, passed through to a VM running VirtualGL via VFIO.
- Latest VirtualGL dev version (2.6.80-20190717)
- Latest TurboVNC dev verison (2.2.80-20190803)

Earlier versions of VirtualGL/TurboVNC show the same symptoms. A variety of 
Nvidia driver versions also show the same symptoms. Running vglrun with the 
+v verbose flag shows no errors.
This has been a bit of a tricky one to diagnose, so any thoughts would be 
useful.

Cheers
Sam.

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