---
id: pr-cccl-cub-8184
repo: NVIDIA/cccl
pr: 8184
title: Avoid passing uninitialized values to scan_op
author: bernhardmgruber
date: '2026-04-13'
url: https://github.com/NVIDIA/cccl/pull/8184
source_category: upstream-code
architectures:
- sm100
tags:
- memory_primitives
- scan
- warpspeed scan
techniques:
- warp-specialization
hardware_features: []
kernel_types:
- memory
- scan
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 1bebf7ee1773d2349bb4baa67bb509e79e8b398c
inclusion_reason: 'Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.'
changed_paths:
- cub/cub/device/dispatch/kernels/kernel_scan_warpspeed.cuh
- thrust/testing/scan.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8184
head_ref_oid: 194b6ac3b22da082401a3b1fb74c3f6827835413
---
# Avoid passing uninitialized values to scan_op

- Repository: `NVIDIA/cccl`
- PR: [8184](https://github.com/NVIDIA/cccl/pull/8184)
- Decision: `Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.`
- Reason: Transfer primitive policy carefully: coalescing, shared-memory staging, partial tiles, and determinism are part of the contract.

## Changed Paths

- `cub/cub/device/dispatch/kernels/kernel_scan_warpspeed.cuh`
- `thrust/testing/scan.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8184`
