---
id: pr-flashinfer-1584
repo: flashinfer-ai/flashinfer
pr: 1584
title: 'fix: semaphoress must be at the fixed range in workspace buffer on trtllm_gen attention'
author: yyihuang
date: '2025-08-26'
url: https://github.com/flashinfer-ai/flashinfer/pull/1584
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- flash-attention
techniques: []
hardware_features: []
kernel_types:
- attention
- flash-attention
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 2482f9fdce62c59e6f3299229e2bcbc118238522
inclusion_reason: kernel file changes
changed_paths:
- csrc/trtllm_fmha_kernel_launcher.cu
head_ref_oid: 46bbe8841fbcdab7e1d140d2e0d4012baa9dabec
artifact_dir: evidence/pull-bundles/flashinfer/gh-1584
---
# fix: semaphoress must be at the fixed range in workspace buffer on trtllm_gen attention

- Repository: `flashinfer-ai/flashinfer`
- PR: [1584](https://github.com/flashinfer-ai/flashinfer/pull/1584)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/trtllm_fmha_kernel_launcher.cu`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-1584`
