SEGFAULT on an AMD 6900XT when enabling `VK_EXT_mesh_shader`

[expenses]

Hi Arseny, thanks for the quick demo using VK_EXT_mesh_shader! Unfortunately for whatever I'm getting a SEGFAULT with I run it with RADV_PERFTEST=ext_ms. Have you encountered this? Is there another environment variable I should be using? Here's the full log from GDB (running via sh is the only way so far that I've figured out how to force RADV_PERFTEST=ext_ms):

gdb --args sh -c 'RADV_PERFTEST=ext_ms ./niagara ../data/kitten.obj'
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Reading symbols from sh...
(No debugging symbols found in sh)
(gdb) r
Starting program: /usr/bin/sh -c RADV_PERFTEST=ext_ms\ ./niagara\ ../data/kitten.obj
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
process 67360 is executing new program: /home/ashley/projects/niagara/build/niagara
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7fffec8e66c0 (LWP 67364)]
[New Thread 0x7fffe7ebe6c0 (LWP 67365)]
GPU0: Intel(R) Xe Graphics (TGL GT2)
GPU1: AMD Radeon RX 6900 XT (RADV NAVI21)
GPU2: llvmpipe (LLVM 14.0.6, 256 bits)
Selected GPU AMD Radeon RX 6900 XT (RADV NAVI21)

Thread 1 "niagara" received signal SIGSEGV, Segmentation fault.
0x00007fffecc7a974 in ?? () from /usr/lib/libvulkan_radeon.so
(gdb) bt
#0  0x00007fffecc7a974 in ?? () from /usr/lib/libvulkan_radeon.so
#1  0x00007fffecc5a9d2 in ?? () from /usr/lib/libvulkan_radeon.so
#2  0x00007fffecc5df7b in ?? () from /usr/lib/libvulkan_radeon.so
#3  0x00007fffecc61521 in ?? () from /usr/lib/libvulkan_radeon.so
#4  0x00007fffecc616e2 in ?? () from /usr/lib/libvulkan_radeon.so
#5  0x00005555555772f4 in createGraphicsPipeline(VkDevice_T*, VkPipelineCache_T*, VkPipelineRenderingCreateInfo const&, std::initializer_list<Shader const*>, VkPipelineLayout_T*, std::initializer_list<int>) ()
#6  0x0000555555565259 in main ()
(gdb)

Here's the device info from vulkaninfo --summary:

GPU1:
    apiVersion         = 4206818 (1.3.226)
    driverVersion      = 92282979 (0x5802063)
    vendorID           = 0x1002
    deviceID           = 0x73bf
    deviceType         = PHYSICAL_DEVICE_TYPE_DISCRETE_GPU
    deviceName         = AMD Radeon RX 6900 XT (RADV NAVI21)
    driverID           = DRIVER_ID_MESA_RADV
    driverName         = radv
    driverInfo         = Mesa 22.3.0-devel (git-c93b72d045)
    conformanceVersion = 1.3.0.0
    deviceUUID         = 00000000-8400-0000-0000-000000000000
    driverUUID         = 414d442d-4d45-5341-2d44-525600000000

[expenses]

I'll try and figure out how to do a debug build of mesa and get back to this.

[expenses]

(creating a debug build was just a case of adding options=(debug !strip) to the Arch Linux PKGBUILD).

Thread 1 "niagara" received signal SIGSEGV, Segmentation fault.
0x00007fffecc7a974 in radv_shader_spirv_to_nir (device=device@entry=0x555555a88d10, stage=stage@entry=0x7ffffffee7a0, key=key@entry=0x7fffffffc1b0) at ../mesa/src/amd/vulkan/radv_shader.c:792
792 ../mesa/src/amd/vulkan/radv_shader.c: No such file or directory.
(gdb) bt
#0  0x00007fffecc7a974 in radv_shader_spirv_to_nir (device=device@entry=0x555555a88d10,
    stage=stage@entry=0x7ffffffee7a0, key=key@entry=0x7fffffffc1b0)
    at ../mesa/src/amd/vulkan/radv_shader.c:792
#1  0x00007fffecc5a9d2 in radv_pipeline_get_nir (retain_shaders=false, pipeline_key=0x7fffffffc1b0,
    stages=0x7ffffffe47b0, pipeline=0x555556292e00) at ../mesa/src/amd/vulkan/radv_pipeline.c:3644
#2  radv_create_shaders (pipeline=0x555556292e00, pipeline_layout=0x7fffffffbf40, device=0x555555a88d10,
    cache=0x0, pipeline_key=0x7fffffffc1b0, pStages=0x555555fa9030, stageCount=3, flags=0,
    custom_hash=0x0, creation_feedback=0x0, stack_sizes=0x0, num_stack_sizes=0x0,
    last_vgt_api_stage=0x5555562937e4) at ../mesa/src/amd/vulkan/radv_pipeline.c:3948
#3  0x00007fffecc5df7b in radv_graphics_pipeline_init (pipeline=pipeline@entry=0x555556292e00,
    device=device@entry=0x555555a88d10, cache=cache@entry=0x0,
    pCreateInfo=pCreateInfo@entry=0x7fffffffc780, extra=extra@entry=0x0)
    at ../mesa/src/amd/vulkan/radv_pipeline.c:6046
#4  0x00007fffecc61521 in radv_graphics_pipeline_create (_device=_device@entry=0x555555a88d10,
    _cache=_cache@entry=0x0, pCreateInfo=pCreateInfo@entry=0x7fffffffc780, extra=extra@entry=0x0,
    pAllocator=pAllocator@entry=0x0, pPipeline=pPipeline@entry=0x7fffffffc558)
    at ../mesa/src/amd/vulkan/radv_pipeline.c:6170
--Type <RET> for more, q to quit, c to continue without paging--
#5  0x00007fffecc616e2 in radv_CreateGraphicsPipelines (_device=0x555555a88d10, pipelineCache=<optimized out>, count=<optimized out>, pCreateInfos=<optimized out>, pAllocator=0x0, pPipelines=<optimized out>)
    at ../mesa/src/amd/vulkan/radv_pipeline.c:6328
#6  0x00005555555772f4 in createGraphicsPipeline(VkDevice_T*, VkPipelineCache_T*, VkPipelineRenderingCreateInfo const&, std::initializer_list<Shader const*>, VkPipelineLayout_T*, std::initializer_list<int>) ()
#7  0x0000555555565259 in main ()

hmm lol

[zeux]

I think I might have seen this with slightly earlier Mesa versions; you need the absolute latest commit from Mesa repository (or, latest as of a week or two ago at least). Just checked with Mesa c93b72d0455f1487fa3fb65a6691ff44a2fbcd35 and it works fine with RADV_PERFTEST env var, no extra variables should be necessary. This is on Ubuntu. Note that you'd also need the absolute latest glslang built & installed for shaders to compile to SPIRV properly.