apps/lens_blur_filter failing on D3D12 backend on buildbots

[steven-johnson]

We recently changed this to run tests using smaller images (which fixed out-of-memory failures on other GPU backends), but we are still seeing failures on the D3D12Compute backend (eg https://buildbot.halide-lang.org/master/#/builders/38/builds/45):

21/53 Test  #21: lens_blur_filter ...................Exit code 0xc0000409
***Exception:   4.21 sec
Error: Unable to create the Direct3D 12 buffer (HRESULT=0xffffffff887a0005, object*=0x0)
vvvvv D3D12 Begin Debug Dump vvvvv
D3D12 Device Adapter: NVIDIA GeForce GTX 750 Ti
^^^^^ D3D12  End  Debug Dump ^^^^^
D3D12 HALT !!!

This may just be another case of a hopelessly-old GPU that needs upgrading, but it would be good to verify that. Assigning for triage.

(In the meantime, I'm going to selectively disable this test on Windows to avoid the failure.)

[dsharletg]

This error means:

DXGI_ERROR_DEVICE_REMOVED0x887A0005 | The video card has been physically removed from the system, or a driver upgrade for the video card has occurred. The application should destroy and recreate the device. For help debugging the problem, call ID3D10Device::GetDeviceRemovedReason.

https://docs.microsoft.com/en-us/windows/win32/direct3ddxgi/dxgi-error

Not sure if that makes sense in this context... maybe it just means this machine needs to be rebooted after an udpate?

[steven-johnson]

Both the winbots have been rebooted within the past couple of days, but I can try again.

[steven-johnson]

Also, that would suggest that ~all of the GPU tests are failing, but only this one seems to be.

[shoaibkamil]

I ran this app locally in a loop for 24hrs and was unable to replicate on my machine with a GTX970. It may be the old 750ti causing it, but not sure.

[slomp]

Yeah, I'm pretty sure it's the curse of the GTX 750 Ti (or its driver) once again 😃