---
id: pr-vllm-30887
repo: vllm-project/vllm
pr: 30887
title: '[Bugfix] [Kernel] Triton attention kernels: mask out V blocks that fall outside sliding window'
author: tdoublep
date: '2025-12-19'
url: https://github.com/vllm-project/vllm/pull/30887
source_category: upstream-code
architectures:
- sm100
tags:
- attention
techniques: []
hardware_features: []
kernel_types:
- attention
languages:
- triton
captured_at: '2026-04-27'
status: merged
merge_sha: b5545d9d5cab2625ac04a19f552631a2034c8f47
inclusion_reason: kernel file changes
changed_paths:
- vllm/attention/ops/triton_unified_attention.py
head_ref_oid: 3de99115f18a31fc72a8d02148aa361e27a5bc0b
artifact_dir: evidence/pull-bundles/vllm/gh-30887
---
# [Bugfix] [Kernel] Triton attention kernels: mask out V blocks that fall outside sliding window

- Repository: `vllm-project/vllm`
- PR: [30887](https://github.com/vllm-project/vllm/pull/30887)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `vllm/attention/ops/triton_unified_attention.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-30887`
