---
id: pr-flashinfer-2137
repo: flashinfer-ai/flashinfer
pr: 2137
title: 'fix: some bugs of headDim 256 trtllm-gen fmha kernels. '
author: PerkzZheng
date: '2025-11-25'
url: https://github.com/flashinfer-ai/flashinfer/pull/2137
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- flash-attention
techniques: []
hardware_features: []
kernel_types:
- attention
- flash-attention
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: fd5273ce37334f8b085e15defe5a6fdb63a750d7
inclusion_reason: kernel file changes
changed_paths:
- flashinfer/artifacts.py
- tests/attention/test_trtllm_gen_attention.py
- tests/comm/test_trtllm_mnnvl_allreduce_custom_comm.py
head_ref_oid: a0133101d4574c15cabc76cffc95e67f5c73c77b
artifact_dir: evidence/pull-bundles/flashinfer/gh-2137
---
# fix: some bugs of headDim 256 trtllm-gen fmha kernels. 

- Repository: `flashinfer-ai/flashinfer`
- PR: [2137](https://github.com/flashinfer-ai/flashinfer/pull/2137)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `flashinfer/artifacts.py`
- `tests/attention/test_trtllm_gen_attention.py`
- `tests/comm/test_trtllm_mnnvl_allreduce_custom_comm.py`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-2137`
