---
id: pr-flashinfer-2716
repo: flashinfer-ai/flashinfer
pr: 2716
title: 'fix(jit): GEMM kernels produce NaN under concurrency — missing GDC flags cause PDL synchronization barriers to compile as no-ops'
author: voipmonitor
date: '2026-03-09'
url: https://github.com/flashinfer-ai/flashinfer/pull/2716
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- gemm
techniques: []
hardware_features: []
kernel_types:
- gemm
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 4c4013be053e499c919bced20ed5ed6d5f5026fb
inclusion_reason: kernel file changes
changed_paths:
- flashinfer/jit/gemm/core.py
head_ref_oid: 4a4c90351197cbea6c0482d175cbb9d902b5a893
artifact_dir: evidence/pull-bundles/flashinfer/gh-2716
---
# fix(jit): GEMM kernels produce NaN under concurrency — missing GDC flags cause PDL synchronization barriers to compile as no-ops

- Repository: `flashinfer-ai/flashinfer`
- PR: [2716](https://github.com/flashinfer-ai/flashinfer/pull/2716)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `flashinfer/jit/gemm/core.py`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-2716`
