NVIDIA VK_EXT_descriptor_heap ray-query device-loss repro

Minimal Vulkan 1.4 repro using a ray-query shader compiled by Slang 2026.13. On NVIDIA 610.74, submitting the shader causes VK_ERROR_DEVICE_LOST.

Shader

Slang 2026.13 lowers the acceleration-structure DescriptorHandle to an 8-byte resource-heap load followed by a conversion:

OpDecorate %_runtimearr_ulong ArrayStride 8
%pointer = OpUntypedAccessChainKHR ... %slang_resourceHeap %handle
%address = OpLoad %ulong %pointer
%scene = OpConvertUToAccelerationStructureKHR %asType %address

The host therefore writes the TLAS device address directly into the resource heap and passes its 8-byte-stride index through the DescriptorHandle.

Requirements

• CMake 3.24 or newer
• Vulkan SDK 1.4 headers, loader, and SPIR-V Tools
• Slang 2026.13 on PATH
• A Vulkan 1.4 device supporting VK_EXT_descriptor_heap, acceleration structures, ray queries, 64-bit shader integers, buffer device addresses, and untyped pointers

Build and run

cmake -S . -B build
cmake --build build --config Release
.\build\Release\vulkan_descriptor_heap_ray_query_repro.exe

CMake compiles ray_query.slang, validates the generated module for Vulkan 1.4, writes its disassembly under build\shader, and copies the binary beside the executable. The command above uses the default Visual Studio multi-configuration generator. With a single-configuration generator such as Ninja, the executable is instead under build.

The run submits GPU work and may reset an affected device. On the known failing configuration it prints:

GPU: NVIDIA GeForce RTX 4070 Ti SUPER, API 1.4.341
Driver: NVIDIA (610.74)
AS source=raw TLAS address + Slang OpConvertUToAccelerationStructureKHR, shaderStride=0x8
Dispatching Slang descriptor-heap AS ray query...
REPRODUCED: VK_ERROR_DEVICE_LOST

A conforming implementation must not lose the device. Use the console output to distinguish a reproduced device loss, a successful ray query, or an error.

Known failing configuration:

GPU:                  NVIDIA GeForce RTX 4070 Ti SUPER
Vendor / device:      0x10de / 0x2705
Driver:               NVIDIA 610.74
Device API:           Vulkan 1.4.341
Slang:                2026.13
VK_EXT_descriptor_heap revision: 1