---
id: pr-vllm-33637
repo: vllm-project/vllm
pr: 33637
title: '[Bugfix] fix DeepSeek R1 with CUTLASS MLA Broken on B200'
author: chaunceyjiang
date: '2026-02-05'
url: https://github.com/vllm-project/vllm/pull/33637
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- mla
techniques: []
hardware_features: []
kernel_types:
- attention
- mla
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: a7be77beef5f59d9d349818b4f2860483551b255
inclusion_reason: kernel file changes
changed_paths:
- vllm/model_executor/layers/attention/mla_attention.py
head_ref_oid: 71a6993878e6c7916f7ab6098eb8d44797934996
artifact_dir: evidence/pull-bundles/vllm/gh-33637
---
# [Bugfix] fix DeepSeek R1 with CUTLASS MLA Broken on B200

- Repository: `vllm-project/vllm`
- PR: [33637](https://github.com/vllm-project/vllm/pull/33637)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `vllm/model_executor/layers/attention/mla_attention.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-33637`
