Internal Error: MyelinCheckException: kernel_gen_ds.cpp:1147: CHECK(!redop->owner()->hardware_compute_capability_compatibility()) failed. In HCCC mode, we have disabled tiled reduce fusion under partition dag, so we should never enter here under HCCC mode.

Description

When building a tensorRT engine with the flag trt.HardwareCompatibilityLevel.SAME_COMPUTE_CAPABILITY enabled, it fails with the error below:

Internal Error: MyelinCheckException: kernel_gen_ds.cpp:1147: CHECK(!redop->owner()->hardware_compute_capability_compatibility()) failed. In HCCC mode, we have disabled tiled reduce fusion under partition dag, so we should never enter here under HCCC mode.
[01/28/2026-08:55:25] [TRT] [E] Error Code: 9: Skipping tactic 0x0000000000000000 due to exception [myelin_graph.h:1182: attachExceptionMsgToGraph] MyelinCheckException: kernel_gen_ds.cpp:1147: CHECK(!redop->owner()->hardware_compute_capability_compatibility()) failed. In HCCC mode, we have disabled tiled reduce fusion under partition dag, so we should never enter here under HCCC mode. In compileGraph at /_src/optimizer/myelin/codeGenerator.cpp:1548

With the above flag disabled, everything works fine (but I wish this engine to be compatible on devices having the same compute compatibility).

Environment

TensorRT Version: 10.14.1

NVIDIA GPU: RTX4090

NVIDIA Driver Version: 535.230.02

CUDA Version: 12.2

CUDNN Version: 8.9

Operating System: Ubuntu 20.04 LTS

Python Version (if applicable): 3.10.12

Tensorflow Version (if applicable):

PyTorch Version (if applicable):

Baremetal or Container (if so, version):

Relevant Files

Model link:

Steps To Reproduce

Commands or scripts:

Have you tried the latest release?:

Attach the captured .json and .bin files from TensorRT's API Capture tool if you're on an x86_64 Unix system

Can this model run on other frameworks? For example run ONNX model with ONNXRuntime (polygraphy run <model.onnx> --onnxrt):

Start with the HCCC failure at kernel_gen_ds.cpp:1147 and the compileGraph call noted at myelin/codeGenerator.cpp:1548. Obtain a minimal reproduction or the missing API Capture .json and .bin files, then reproduce with TensorRT 10.14.1 and SAME_COMPUTE_CAPABILITY enabled. Done means the engine builds successfully in HCCC mode without this internal error.