---
id: pr-tensorrt-llm-12666
repo: NVIDIA/TensorRT-LLM
pr: 12666
title: '[https://nvbugs/5836828][fix] Fix GPTOSS CUTLASS MOE on Hopper nvlink one-sided workspace overflow'
author: dongfengy
date: '2026-04-02'
url: https://github.com/NVIDIA/TensorRT-LLM/pull/12666
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- hopper
- mxfp4
techniques: []
hardware_features:
- fp4
- hopper
- mxfp4
kernel_types:
- moe
languages:
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: 2c809aee272e77569093490d8a7131f9423a19a4
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- tensorrt_llm/_torch/modules/fused_moe/fused_moe_cutlass.py
artifact_dir: evidence/pull-bundles/tensorrt-llm/gh-12666
head_ref_oid: 212f6eac87fdc743f98dcb09584d176d07825436
---
# [https://nvbugs/5836828][fix] Fix GPTOSS CUTLASS MOE on Hopper nvlink one-sided workspace overflow

- Repository: `NVIDIA/TensorRT-LLM`
- PR: [12666](https://github.com/NVIDIA/TensorRT-LLM/pull/12666)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `tensorrt_llm/_torch/modules/fused_moe/fused_moe_cutlass.py`

## Evidence Bundle

`evidence/pull-bundles/tensorrt-llm/gh-12666`
