mixing cl_khr_icd version 1 and 2 ICD causes qsort to overwrite dispatch table to NULL

[karolherbst]

I had a user reporting a crash starting with the enablement of cl_khr_icd version 2.

I debugged a little and it appears that after ocl-icd properly sets the dispatch table through clIcdSetPlatformDispatchDataKHR ocl-icd might reorder the platforms for qsort. This corrupts the set dispatch table:

Thread 1 "clinfo" hit Hardware watchpoint 2: -location p->disp_data.dispatch.clGetPlatformInfo

Old value = (cl_int (*)(cl_platform_id, cl_platform_info, size_t, void *, size_t *)) 0x7fffe67b6a90 <rusticl::api::icd::clGetPlatformInfo>
New value = (cl_int (*)(cl_platform_id, cl_platform_info, size_t, void *, size_t *)) 0x0
0x00007ffff7eaf600 in __memmove_avx_unaligned_erms () from /lib64/libc.so.6
(gdb) bt
#0  0x00007ffff7eaf600 in __memmove_avx_unaligned_erms () from /lib64/libc.so.6
#1  0x00007ffff7d879e4 in indirect_msort_with_tmp () from /lib64/libc.so.6
#2  0x00007ffff7d87b69 in qsort_r () from /lib64/libc.so.6
#3  0x00007ffff7f80c18 in _sort_platforms (picds=0x555558237980, npicds=4) at ../ocl_icd_loader.c:413
#4  0x00007ffff7f81ab4 in _find_and_check_platforms (num_icds=5) at ../ocl_icd_loader.c:636
#5  0x00007ffff7f82af3 in __initClIcd () at ../ocl_icd_loader.c:917
#6  0x00007ffff7f82c32 in _initClIcd_real () at ../ocl_icd_loader.c:968
#7  0x00007ffff7f82d3f in _initClIcd () at ../ocl_icd_loader.c:997
#8  0x00007ffff7f83761 in clGetPlatformIDs (num_entries=0, platforms=0x0, num_platforms=0x7fffffffd400) at ../ocl_icd_loader.c:1162
#9  0x000055555555580e in main ()

Running with OCL_ICD_PLATFORM_SORT=none does prevent the corruption from occuring.

[karolherbst]

Any update on this issue? I'm seeing more and more users running into this.

[sanguinariojoe]

Yep, I can confirm it started failing on Arch Linux recently

P.S. Although in my case, if I set OCL_ICD_PLATFORM_SORT=none then it fails while calling clGetDeviceIDs(). The only way to make it work for me is setting rusticl as the very only platform with OCL_ICD_VENDORS=/etc/OpenCL/vendors/rusticl.icd

[Kerilk]

I will address this overlook ASAP, thanks for reporting.

[Kerilk]

Wrote a fix here: #41
Anybody who can reproduce would be able to give it a try?

[sanguinariojoe]

git fetch origin
git checkout fix-sorting
autoreconf -fiv
./configure --enable-debug --prefix=/usr
make -j
sudo make install
ldd /usr/bin/clinfo

So I am checking that it is using this ocl-icd (it would try to use the intel-oneapi-compiler-shared-runtime if one does not remove it):

        linux-vdso.so.1 (0x00007faa23d57000)
        libOpenCL.so.1 => /usr/lib/libOpenCL.so.1 (0x00007faa23caa000)
        libc.so.6 => /usr/lib/libc.so.6 (0x00007faa23a00000)
        /lib64/ld-linux-x86-64.so.2 => /usr/lib64/ld-linux-x86-64.so.2 (0x00007faa23d59000)

Time to test it!

clinfo

And it works!

Number of platforms                               2
  Platform Name                                   rusticl
  Platform Vendor                                 Mesa/X.org
  Platform Version                                OpenCL 3.0 
  Platform Profile                                FULL_PROFILE
  Platform Extensions                             cl_khr_icd cl_khr_byte_addressable_store cl_khr_create_command_queue cl_khr_expect_assume cl_khr_extended_bit_ops cl_khr_extended_versioning cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_il_program cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_integer_dot_product cl_khr_spirv_no_integer_wrap_decoration cl_khr_spirv_queries cl_khr_suggested_local_work_size cl_khr_spirv_linkonce_odr cl_khr_fp16 cl_khr_gl_sharing cles_khr_int64 cl_khr_kernel_clock cl_khr_3d_image_writes cl_khr_depth_images cl_ext_image_unorm_int_2_101010 cl_khr_pci_bus_info cl_khr_priority_hints cl_khr_device_uuid cl_khr_subgroup_shuffle cl_khr_subgroup_shuffle_relative cl_arm_shared_virtual_memory cl_ext_buffer_device_address
  Platform Extensions with Version                cl_khr_icd                                                       0x800000 (2.0.0)
                                                  cl_khr_byte_addressable_store                                    0x400000 (1.0.0)
                                                  cl_khr_create_command_queue                                      0x400000 (1.0.0)
                                                  cl_khr_expect_assume                                             0x400000 (1.0.0)
                                                  cl_khr_extended_bit_ops                                          0x400000 (1.0.0)
                                                  cl_khr_extended_versioning                                       0x400000 (1.0.0)
                                                  cl_khr_global_int32_base_atomics                                 0x400000 (1.0.0)
                                                  cl_khr_global_int32_extended_atomics                             0x400000 (1.0.0)
                                                  cl_khr_il_program                                                0x400000 (1.0.0)
                                                  cl_khr_local_int32_base_atomics                                  0x400000 (1.0.0)
                                                  cl_khr_local_int32_extended_atomics                              0x400000 (1.0.0)
                                                  cl_khr_integer_dot_product                                       0x800000 (2.0.0)
                                                  cl_khr_spirv_no_integer_wrap_decoration                          0x400000 (1.0.0)
                                                  cl_khr_spirv_queries                                             0x400000 (1.0.0)
                                                  cl_khr_suggested_local_work_size                                 0x400000 (1.0.0)
                                                  cl_khr_spirv_linkonce_odr                                        0x400000 (1.0.0)
                                                  cl_khr_fp16                                                      0x400000 (1.0.0)
                                                  cl_khr_gl_sharing                                                0x400000 (1.0.0)
                                                  cles_khr_int64                                                   0x400000 (1.0.0)
                                                  cl_khr_kernel_clock                                              0x400000 (1.0.0)
                                                  cl_khr_3d_image_writes                                           0x400000 (1.0.0)
                                                  cl_khr_depth_images                                              0x400000 (1.0.0)
                                                  cl_ext_image_unorm_int_2_101010                                  0x400000 (1.0.0)
                                                  cl_khr_pci_bus_info                                              0x400000 (1.0.0)
                                                  cl_khr_priority_hints                                            0x400000 (1.0.0)
                                                  cl_khr_device_uuid                                               0x400000 (1.0.0)
                                                  cl_khr_subgroup_shuffle                                          0x400000 (1.0.0)
                                                  cl_khr_subgroup_shuffle_relative                                 0x400000 (1.0.0)
                                                  cl_arm_shared_virtual_memory                                     0x400000 (1.0.0)
                                                  cl_ext_buffer_device_address                                     0x400002 (1.0.2)
  Platform Numeric Version                        0xc00000 (3.0.0)
  Platform Extensions function suffix             MESA
  Platform Host timer resolution                  1ns

  Platform Name                                   AMD Accelerated Parallel Processing
  Platform Vendor                                 Advanced Micro Devices, Inc.
  Platform Version                                OpenCL 2.1 AMD-APP.dbg (3649.0)
  Platform Profile                                FULL_PROFILE
  Platform Extensions                             cl_khr_icd cl_amd_event_callback 
  Platform Extensions function suffix             AMD
  Platform Host timer resolution                  1ns

  Platform Name                                   rusticl
Number of devices                                 1
  Device Name                                     AMD Radeon RX Vega (radeonsi, vega10, ACO, DRM 3.64, 6.16.7-arch1-1)
  Device Vendor                                   AMD
  Device Vendor ID                                0x1002
  Device Version                                  OpenCL 3.0 
  Device UUID                                     00000000-1e00-0000-0000-000000000000
  Driver UUID                                     414d442d-4d45-5341-2d44-525600000000
  Valid Device LUID                               No
  Device LUID                                     0000-000000000000
  Device Node Mask                                0
  Device Numeric Version                          0xc00000 (3.0.0)
  Driver Version                                  25.2.2-arch1.2
  Device OpenCL C Version                         OpenCL C 1.2 
  Device OpenCL C Numeric Version                 0x402000 (1.2.0)
  Device OpenCL C all versions                    OpenCL C                                                         0xc00000 (3.0.0)
                                                  OpenCL C                                                         0x402000 (1.2.0)
                                                  OpenCL C                                                         0x401000 (1.1.0)
                                                  OpenCL C                                                         0x400000 (1.0.0)
  Device OpenCL C features                        __opencl_c_integer_dot_product_input_4x8bit                      0x800000 (2.0.0)
                                                  __opencl_c_integer_dot_product_input_4x8bit_packed               0x800000 (2.0.0)
                                                  __opencl_c_int64                                                 0x400000 (1.0.0)
                                                  __opencl_c_kernel_clock_scope_device                             0x400000 (1.0.0)
                                                  __opencl_c_kernel_clock_scope_sub_group                          0x400000 (1.0.0)
                                                  __opencl_c_images                                                0x400000 (1.0.0)
                                                  __opencl_c_read_write_images                                     0x400000 (1.0.0)
                                                  __opencl_c_3d_image_writes                                       0x400000 (1.0.0)
                                                  __opencl_c_ext_image_unorm_int_2_101010                          0x400000 (1.0.0)
                                                  __opencl_c_subgroups                                             0x400000 (1.0.0)
  Latest conformance test passed                  v0000-01-01-00
  Device Type                                     GPU
  Device PCI bus info (KHR)                       PCI-E, 0000:1e:00.0
  Device Profile                                  EMBEDDED_PROFILE
  Device Available                                Yes
  Compiler Available                              Yes
  Linker Available                                Yes
  Max compute units                               64
  Max clock frequency                             1630MHz
  Device Partition                                (core)
    Max number of sub-devices                     0
    Supported partition types                     None
    Supported affinity domains                    (n/a)
  Max work item dimensions                        3
  Max work item sizes                             1024x1024x1024
  Max work group size                             1024
  Preferred work group size multiple (device)     64
  Preferred work group size multiple (kernel)     64
  Max sub-groups per work group                   16
  Preferred / native vector sizes                 
    char                                                 1 / 1       
    short                                                1 / 1       
    int                                                  1 / 1       
    long                                                 1 / 1       
    half                                                 1 / 1        (cl_khr_fp16)
    float                                                1 / 1       
    double                                               0 / 0        (n/a)
  Half-precision Floating-point support           (cl_khr_fp16)
    Denormals                                     No
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 No
    Round to infinity                             No
    IEEE754-2008 fused multiply-add               No
    Support is emulated in software               No
  Single-precision Floating-point support         (core)
    Denormals                                     No
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 No
    Round to infinity                             No
    IEEE754-2008 fused multiply-add               No
    Support is emulated in software               No
    Correctly-rounded divide and sqrt operations  No
  Double-precision Floating-point support         (n/a)
  Address bits                                    64, Little-Endian
  Global memory size                              8589934592 (8GiB)
  Error Correction support                        No
  Max memory allocation                           2147483647 (2GiB)
  Unified memory for Host and Device              No
  Shared Virtual Memory (SVM) capabilities        (core)
    Coarse-grained buffer sharing                 Yes
    Fine-grained buffer sharing                   No
    Fine-grained system sharing                   No
    Atomics                                       No
  Shared Virtual Memory (SVM) capabilities (ARM)  
    Coarse-grained buffer sharing                 Yes
    Fine-grained buffer sharing                   No
    Fine-grained system sharing                   No
    Atomics                                       No
  Minimum alignment for any data type             128 bytes
  Alignment of base address                       4096 bits (512 bytes)
  Preferred alignment for atomics                 
    SVM                                           0 bytes
    Global                                        0 bytes
    Local                                         0 bytes
  Atomic memory capabilities                      relaxed, work-group scope
  Atomic fence capabilities                       relaxed, acquire/release, work-group scope
  Max size for global variable                    0
  Preferred total size of global vars             0
  Global Memory cache type                        None
  Image support                                   Yes
    Max number of samplers per kernel             32
    Max size for 1D images from buffer            134217727 pixels
    Max 1D or 2D image array size                 2048 images
    Base address alignment for 2D image buffers   0 bytes
    Pitch alignment for 2D image buffers          0 pixels
    Max 2D image size                             16384x16384 pixels
    Max 3D image size                             2048x2048x2048 pixels
    Max number of read image args                 32
    Max number of write image args                16
    Max number of read/write image args           16
  Pipe support                                    No
  Max number of pipe args                         0
  Max active pipe reservations                    0
  Max pipe packet size                            0
  Local memory type                               Global
  Local memory size                               65536 (64KiB)
  Max number of constant args                     16
  Max constant buffer size                        67108864 (64MiB)
  Generic address space support                   No
  Max size of kernel argument                     4096 (4KiB)
  Queue properties (on host)                      
    Out-of-order execution                        Yes
    Profiling                                     Yes
  Device enqueue capabilities                     (n/a)
  Queue properties (on device)                    
    Out-of-order execution                        No
    Profiling                                     No
    Preferred size                                0
    Max size                                      0
  Max queues on device                            0
  Max events on device                            0
  Prefer user sync for interop                    Yes
  Profiling timer resolution                      38ns
  Execution capabilities                          
    Run OpenCL kernels                            Yes
    Run native kernels                            No
    Non-uniform work-groups                       No
    Work-group collective functions               No
    Sub-group independent forward progress        No
    IL version                                    SPIR-V_1.0 SPIR-V_1.1 SPIR-V_1.2 SPIR-V_1.3 SPIR-V_1.4 SPIR-V_1.5 SPIR-V_1.6
    ILs with version                              SPIR-V                                                           0x400000 (1.0.0)
                                                  SPIR-V                                                           0x401000 (1.1.0)
                                                  SPIR-V                                                           0x402000 (1.2.0)
                                                  SPIR-V                                                           0x403000 (1.3.0)
                                                  SPIR-V                                                           0x404000 (1.4.0)
                                                  SPIR-V                                                           0x405000 (1.5.0)
                                                  SPIR-V                                                           0x406000 (1.6.0)
  printf() buffer size                            1048576 (1024KiB)
  Built-in kernels                                (n/a)
  Built-in kernels with version                   (n/a)
  Device Extensions                               cl_khr_byte_addressable_store cl_khr_create_command_queue cl_khr_expect_assume cl_khr_extended_bit_ops cl_khr_extended_versioning cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_il_program cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_integer_dot_product cl_khr_spirv_no_integer_wrap_decoration cl_khr_spirv_queries cl_khr_suggested_local_work_size cl_khr_spirv_linkonce_odr cl_khr_fp16 cl_khr_gl_sharing cles_khr_int64 cl_khr_kernel_clock cl_khr_3d_image_writes cl_khr_depth_images cl_ext_image_unorm_int_2_101010 cl_khr_pci_bus_info cl_khr_priority_hints cl_khr_device_uuid cl_khr_subgroup_shuffle cl_khr_subgroup_shuffle_relative cl_arm_shared_virtual_memory cl_ext_buffer_device_address
  Device Extensions with Version                  cl_khr_byte_addressable_store                                    0x400000 (1.0.0)
                                                  cl_khr_create_command_queue                                      0x400000 (1.0.0)
                                                  cl_khr_expect_assume                                             0x400000 (1.0.0)
                                                  cl_khr_extended_bit_ops                                          0x400000 (1.0.0)
                                                  cl_khr_extended_versioning                                       0x400000 (1.0.0)
                                                  cl_khr_global_int32_base_atomics                                 0x400000 (1.0.0)
                                                  cl_khr_global_int32_extended_atomics                             0x400000 (1.0.0)
                                                  cl_khr_il_program                                                0x400000 (1.0.0)
                                                  cl_khr_local_int32_base_atomics                                  0x400000 (1.0.0)
                                                  cl_khr_local_int32_extended_atomics                              0x400000 (1.0.0)
                                                  cl_khr_integer_dot_product                                       0x800000 (2.0.0)
                                                  cl_khr_spirv_no_integer_wrap_decoration                          0x400000 (1.0.0)
                                                  cl_khr_spirv_queries                                             0x400000 (1.0.0)
                                                  cl_khr_suggested_local_work_size                                 0x400000 (1.0.0)
                                                  cl_khr_spirv_linkonce_odr                                        0x400000 (1.0.0)
                                                  cl_khr_fp16                                                      0x400000 (1.0.0)
                                                  cl_khr_gl_sharing                                                0x400000 (1.0.0)
                                                  cles_khr_int64                                                   0x400000 (1.0.0)
                                                  cl_khr_kernel_clock                                              0x400000 (1.0.0)
                                                  cl_khr_3d_image_writes                                           0x400000 (1.0.0)
                                                  cl_khr_depth_images                                              0x400000 (1.0.0)
                                                  cl_ext_image_unorm_int_2_101010                                  0x400000 (1.0.0)
                                                  cl_khr_pci_bus_info                                              0x400000 (1.0.0)
                                                  cl_khr_priority_hints                                            0x400000 (1.0.0)
                                                  cl_khr_device_uuid                                               0x400000 (1.0.0)
                                                  cl_khr_subgroup_shuffle                                          0x400000 (1.0.0)
                                                  cl_khr_subgroup_shuffle_relative                                 0x400000 (1.0.0)
                                                  cl_arm_shared_virtual_memory                                     0x400000 (1.0.0)
                                                  cl_ext_buffer_device_address                                     0x400002 (1.0.2)

  Platform Name                                   AMD Accelerated Parallel Processing
Number of devices                                 1
  Device Name                                     gfx900:xnack-
  Device Vendor                                   Advanced Micro Devices, Inc.
  Device Vendor ID                                0x1002
  Device Version                                  OpenCL 2.0 
  Driver Version                                  3649.0 (HSA1.1,LC)
  Device OpenCL C Version                         OpenCL C 2.0 
  Device Type                                     GPU
  Device Board Name (AMD)                         AMD Radeon RX Vega
  Device PCI-e ID (AMD)                           0x687f
  Device Topology (AMD)                           PCI-E, 0000:1e:00.0
  Device Profile                                  FULL_PROFILE
  Device Available                                Yes
  Compiler Available                              Yes
  Linker Available                                Yes
  Max compute units                               64
  SIMD per compute unit (AMD)                     4
  SIMD width (AMD)                                16
  SIMD instruction width (AMD)                    1
  Max clock frequency                             1630MHz
  Graphics IP (AMD)                               9.0
  Device Partition                                (core)
    Max number of sub-devices                     64
    Supported partition types                     None
    Supported affinity domains                    (n/a)
  Max work item dimensions                        3
  Max work item sizes                             1024x1024x1024
  Max work group size                             256
  Preferred work group size (AMD)                 256
  Max work group size (AMD)                       1024
  Preferred work group size multiple (kernel)     64
  Wavefront width (AMD)                           64
  Preferred / native vector sizes                 
    char                                                 4 / 4       
    short                                                2 / 2       
    int                                                  1 / 1       
    long                                                 1 / 1       
    half                                                 1 / 1        (cl_khr_fp16)
    float                                                1 / 1       
    double                                               1 / 1        (cl_khr_fp64)
  Half-precision Floating-point support           (cl_khr_fp16)
    Denormals                                     Yes
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 Yes
    Round to infinity                             Yes
    IEEE754-2008 fused multiply-add               Yes
    Support is emulated in software               No
  Single-precision Floating-point support         (core)
    Denormals                                     Yes
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 Yes
    Round to infinity                             Yes
    IEEE754-2008 fused multiply-add               Yes
    Support is emulated in software               No
    Correctly-rounded divide and sqrt operations  Yes
  Double-precision Floating-point support         (cl_khr_fp64)
    Denormals                                     Yes
    Infinity and NANs                             Yes
    Round to nearest                              Yes
    Round to zero                                 Yes
    Round to infinity                             Yes
    IEEE754-2008 fused multiply-add               Yes
    Support is emulated in software               No
  Address bits                                    64, Little-Endian
  Global memory size                              8573157376 (7.984GiB)
  Global free memory (AMD)                        8200192 (7.82GiB) 8200192 (7.82GiB)
  Global memory channels (AMD)                    64
  Global memory banks per channel (AMD)           4
  Global memory bank width (AMD)                  256 bytes
  Error Correction support                        No
  Max memory allocation                           7287183768 (6.787GiB)
  Unified memory for Host and Device              No
  Shared Virtual Memory (SVM) capabilities        (core)
    Coarse-grained buffer sharing                 Yes
    Fine-grained buffer sharing                   Yes
    Fine-grained system sharing                   No
    Atomics                                       No
  Minimum alignment for any data type             128 bytes
  Alignment of base address                       2048 bits (256 bytes)
  Preferred alignment for atomics                 
    SVM                                           0 bytes
    Global                                        0 bytes
    Local                                         0 bytes
  Max size for global variable                    7287183768 (6.787GiB)
  Preferred total size of global vars             8573157376 (7.984GiB)
  Global Memory cache type                        Read/Write
  Global Memory cache size                        16384 (16KiB)
  Global Memory cache line size                   64 bytes
  Image support                                   Yes
    Max number of samplers per kernel             16
    Max size for 1D images from buffer            134217728 pixels
    Max 1D or 2D image array size                 8192 images
    Base address alignment for 2D image buffers   256 bytes
    Pitch alignment for 2D image buffers          256 pixels
    Max 2D image size                             16384x16384 pixels
    Max 3D image size                             16384x16384x8192 pixels
    Max number of read image args                 128
    Max number of write image args                8
    Max number of read/write image args           64
  Max number of pipe args                         16
  Max active pipe reservations                    16
  Max pipe packet size                            2992216472 (2.787GiB)
  Local memory type                               Local
  Local memory size                               65536 (64KiB)
  Local memory size per CU (AMD)                  65536 (64KiB)
  Local memory banks (AMD)                        32
  Max number of constant args                     8
  Max constant buffer size                        7287183768 (6.787GiB)
  Preferred constant buffer size (AMD)            16384 (16KiB)
  Max size of kernel argument                     1024
  Queue properties (on host)                      
    Out-of-order execution                        No
    Profiling                                     Yes
  Queue properties (on device)                    
    Out-of-order execution                        Yes
    Profiling                                     Yes
    Preferred size                                262144 (256KiB)
    Max size                                      8388608 (8MiB)
  Max queues on device                            1
  Max events on device                            1024
  Prefer user sync for interop                    Yes
  Number of P2P devices (AMD)                     0
  Profiling timer resolution                      1ns
  Profiling timer offset since Epoch (AMD)        0ns (Thu Jan  1 01:00:00 1970)
  Execution capabilities                          
    Run OpenCL kernels                            Yes
    Run native kernels                            No
    Thread trace supported (AMD)                  No
    Number of async queues (AMD)                  8
    Max real-time compute queues (AMD)            8
    Max real-time compute units (AMD)             64
  printf() buffer size                            4194304 (4MiB)
  Built-in kernels                                (n/a)
  Device Extensions                               cl_khr_fp64 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_fp16 cl_khr_gl_sharing cl_amd_device_attribute_query cl_amd_media_ops cl_amd_media_ops2 cl_khr_image2d_from_buffer cl_khr_subgroups cl_khr_depth_images cl_amd_copy_buffer_p2p cl_amd_assembly_program 


NULL platform behavior
  clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...)  rusticl
  clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...)   Success [MESA]
  clCreateContext(NULL, ...) [default]            Success [MESA]
  clCreateContext(NULL, ...) [other]              Success [AMD]
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT)  Success (1)
    Platform Name                                 rusticl
    Device Name                                   AMD Radeon RX Vega (radeonsi, vega10, ACO, DRM 3.64, 6.16.7-arch1-1)
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU)  No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU)  Success (1)
    Platform Name                                 rusticl
    Device Name                                   AMD Radeon RX Vega (radeonsi, vega10, ACO, DRM 3.64, 6.16.7-arch1-1)
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR)  No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM)  No devices found in platform
  clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL)  Success (1)
    Platform Name                                 rusticl
    Device Name                                   AMD Radeon RX Vega (radeonsi, vega10, ACO, DRM 3.64, 6.16.7-arch1-1)

ICD loader properties
  ICD loader Name                                 OpenCL ICD Loader
  ICD loader Vendor                               OCL Icd free software
  ICD loader Version                              2.3.3
  ICD loader Profile                              OpenCL 3.0

[Kerilk]

Thanks a lot for the quick test. Once I hear back from @karolherbst I will make a new release.