Intermittent Crash in NSight Graphics Frame Debug Capture

Developer Tools Nsight Graphics
1

Hello,

I have encountered a crash in our Vulkan application when capturing frames in NSight Graphics for debugging.

This is intermittent (75% repro) and seems to occur in the “Refreshing event timings” phase. Sometimes a capture succeeds, but hitting “Refresh Event Timings” later repro’s the crash.

Attaching a debugger to our application before capturing the frame allows us to see the call stack. Our presentation thread is executing vkQueuePresentKHR. A separate thread has a stack involving the NVidia driver and NSight interception dll:

nvoglv64.dll!00007ffc42265dfa()
nvoglv64.dll!00007ffc425e31cd()
nvoglv64.dll!00007ffc425e021a()
nvoglv64.dll!00007ffc424d5b72()
Nvda.Graphics.Interception.dll!00007ffbebdf9684()
Nvda.Graphics.Interception.dll!00007ffbebeb32a8()
Nvda.Graphics.Interception.dll!00007ffbec75a046()
Nvda.Graphics.Interception.dll!00007ffbec75d0c0()
Nvda.Graphics.Interception.dll!00007ffbec750b93()
Nvda.Graphics.Interception.dll!00007ffbec75038e()
Nvda.Graphics.Interception.dll!00007ffbeca9284a()
ucrtbase.dll!thread_start<unsigned int (__cdecl*)(void *),1>()
kernel32.dll!BaseThreadInitThunk()
ntdll.dll!RtlUserThreadStart()

I have replicated this with a minified C++ capture. The capture is also crashing intermittently, without the rest of the application logic.

In the minified repro, we have a single render pass and draw call using a vertex buffer that has been uploaded in a separate transfer queue with a staging buffer. Performing the vkCmdCopyBuffer on the graphics queue rather than the separate transfer queue seems to mask the issue.

Also, please note that we are using both VK_KHR_imageless_framebuffer and VK_KHR_synchronization2. I noticed that the generated VulkanReplay.cpp code does not support overriding image views for swapchain images in the chained VkRenderPassAttachmentBeginInfo structure in VulkanReplay_CmdBeginRenderPass2. It appears that this is implemented only for VulkanReplay_CmdBeginRenderPass. Calling vkCmdBeginRenderPass rather than vkCmdBeginRenderPass2 does not seem to work around the issue; however.

Please advise if I can provide more details to help.

Thank you kindly,

  • Kearwood “Kip” Gilbert
2

Please note that the call stack was captured using NSight Graphics 2023.2.0 and the Geforce 535.98 driver on an RTX 3060.

3

Hi Kearwood,

Can you provide me with the repro example? That would allow us to make progress the quickest.

Thanks,
Jeff@NVIDIA