---
id: pr-vllm-34673
repo: vllm-project/vllm
pr: 34673
title: '[Bugfix][MoE Kernel] Fix incorrect routing selection for models without expert groups (e.g., MiniMax-M2.1)'
author: wwl2755
date: '2026-02-18'
url: https://github.com/vllm-project/vllm/pull/34673
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 847a57cd1217c6fd51f8e1813af5fed31bae1a2f
inclusion_reason: defer
changed_paths:
- tests/kernels/moe/test_flashinfer.py
- vllm/model_executor/layers/fused_moe/config.py
- vllm/model_executor/layers/fused_moe/router/fused_topk_bias_router.py
- vllm/model_executor/layers/fused_moe/router/fused_topk_router.py
- vllm/model_executor/layers/fused_moe/router/grouped_topk_router.py
artifact_dir: evidence/pull-bundles/vllm/gh-34673
head_ref_oid: 5b94023546fb879a49f97147c7eab0cc0907e5e9
---
# [Bugfix][MoE Kernel] Fix incorrect routing selection for models without expert groups (e.g., MiniMax-M2.1)

- Repository: `vllm-project/vllm`
- PR: [34673](https://github.com/vllm-project/vllm/pull/34673)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `tests/kernels/moe/test_flashinfer.py`
- `vllm/model_executor/layers/fused_moe/config.py`
- `vllm/model_executor/layers/fused_moe/router/fused_topk_bias_router.py`
- `vllm/model_executor/layers/fused_moe/router/fused_topk_router.py`
- `vllm/model_executor/layers/fused_moe/router/grouped_topk_router.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-34673`
