---
id: pr-vllm-28841
repo: vllm-project/vllm
pr: 28841
title: '[Bugfix] Fix GPT-OSS AR+NORM fusion'
author: elvischenv
date: '2025-11-25'
url: https://github.com/vllm-project/vllm/pull/28841
source_category: upstream-code
architectures:
- sm100
tags:
- kernel-fusion
- moe
- pipeline-stages
techniques:
- kernel-fusion
- pipeline-stages
hardware_features: []
kernel_types:
- moe
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 6330f9477db214477004df6546f86e3f14f8eab9
inclusion_reason: kernel file changes
changed_paths:
- .buildkite/test-pipeline.yaml
- tests/compile/distributed/test_fusions_e2e.py
- vllm/distributed/device_communicators/symm_mem.py
- vllm/model_executor/layers/fused_moe/layer.py
head_ref_oid: 9423e90ae24978c8de3f65f5e6100721f7d15f9e
artifact_dir: evidence/pull-bundles/vllm/gh-28841
---
# [Bugfix] Fix GPT-OSS AR+NORM fusion

- Repository: `vllm-project/vllm`
- PR: [28841](https://github.com/vllm-project/vllm/pull/28841)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `.buildkite/test-pipeline.yaml`
- `tests/compile/distributed/test_fusions_e2e.py`
- `vllm/distributed/device_communicators/symm_mem.py`
- `vllm/model_executor/layers/fused_moe/layer.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-28841`
