---
id: pr-flash-attention-2273
repo: Dao-AILab/flash-attention
pr: 2273
title: Correct Cutlass Error Handling
author: ankutalev
date: '2026-02-25'
url: https://github.com/Dao-AILab/flash-attention/pull/2273
source_category: upstream-code
architectures:
- sm100
tags:
- cuda kernel
- cutlass
techniques: []
hardware_features: []
kernel_types:
- attention
languages:
- cuda-cpp
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: 484a5dc1b1058bcbe03b3aeb81334c49cfcf6ba3
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- hopper/cuda_check.h
- hopper/flash_bwd_launch_template.h
- hopper/flash_fwd_combine_launch_template.h
- hopper/flash_fwd_launch_template.h
artifact_dir: evidence/pull-bundles/flash-attention/gh-2273
head_ref_oid: 1b3cf278fadb0fad6a2034a2384bea1517c153f0
---
# Correct Cutlass Error Handling

- Repository: `Dao-AILab/flash-attention`
- PR: [2273](https://github.com/Dao-AILab/flash-attention/pull/2273)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `hopper/cuda_check.h`
- `hopper/flash_bwd_launch_template.h`
- `hopper/flash_fwd_combine_launch_template.h`
- `hopper/flash_fwd_launch_template.h`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-2273`
