---
id: pr-vllm-28561
repo: vllm-project/vllm
pr: 28561
title: '[Bugfix] Fix SM100 gpt-oss regression due to faulty attn sink support'
author: mgoin
date: '2025-11-13'
url: https://github.com/vllm-project/vllm/pull/28561
source_category: upstream-code
architectures:
- sm100
tags:
- attention
techniques: []
hardware_features: []
kernel_types:
- attention
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: a543e678b45a08c6bd98a4e5ebcc244679003659
inclusion_reason: kernel file changes
changed_paths:
- vllm/utils/flashinfer.py
- vllm/v1/attention/backends/flashinfer.py
head_ref_oid: afee3f5effc0dcc4a7ee1c6a4ffd17c35eb0b7c9
artifact_dir: evidence/pull-bundles/vllm/gh-28561
---
# [Bugfix] Fix SM100 gpt-oss regression due to faulty attn sink support

- Repository: `vllm-project/vllm`
- PR: [28561](https://github.com/vllm-project/vllm/pull/28561)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `vllm/utils/flashinfer.py`
- `vllm/v1/attention/backends/flashinfer.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-28561`
