---
id: pr-vllm-14253
repo: vllm-project/vllm
pr: 14253
title: '[BugFix] MLA + V1, illegal memory access and accuracy issues'
author: LucasWilkinson
date: '2025-03-06'
url: https://github.com/vllm-project/vllm/pull/14253
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- mla
techniques: []
hardware_features: []
kernel_types:
- attention
- mla
languages:
- triton
captured_at: '2026-04-27'
status: merged
merge_sha: f6bb18fd9a19e5e4fb1991339638fc666d06b27a
inclusion_reason: kernel file changes
changed_paths:
- tests/v1/worker/test_gpu_input_batch.py
- vllm/v1/attention/backends/flash_attn.py
- vllm/v1/attention/backends/mla/common.py
- vllm/v1/attention/backends/mla/flashmla.py
- vllm/v1/attention/backends/mla/triton_mla.py
- vllm/v1/worker/gpu_input_batch.py
- vllm/v1/worker/gpu_model_runner.py
head_ref_oid: 6557ea20131cfb2ca2c5ccd5d265fe00e67833b7
artifact_dir: evidence/pull-bundles/vllm/gh-14253
---
# [BugFix] MLA + V1, illegal memory access and accuracy issues

- Repository: `vllm-project/vllm`
- PR: [14253](https://github.com/vllm-project/vllm/pull/14253)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/v1/worker/test_gpu_input_batch.py`
- `vllm/v1/attention/backends/flash_attn.py`
- `vllm/v1/attention/backends/mla/common.py`
- `vllm/v1/attention/backends/mla/flashmla.py`
- `vllm/v1/attention/backends/mla/triton_mla.py`
- `vllm/v1/worker/gpu_input_batch.py`
- `vllm/v1/worker/gpu_model_runner.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-14253`
