Landing: 58925a5a1305

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Project / Subsystem

gcc / openmp

Date

2026-07-15

Author

Thomas Schwinge

Commit

58925a5a130561aa89fd20ea4f731f2c73384b2e

Source

github

Perf win

Breaking

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project: gcc
subsystem: openmp
patch_id: —
commit_hash: 58925a5a130561aa89fd20ea4f731f2c73384b2e
source_type: github
headline: OpenMP: Fix memory access faults for non-USM offloads with 'nohost'
tldr: Corrects OpenMP's 'nohost' target handling to prevent memory access faults in non-USM offloads.
author: Thomas Schwinge
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • openmp
• offloading
• gpu
• memory access
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/58925a5a130561aa89fd20ea4f731f2c73384b2e
date: 2026-07-15T00:00:00.000Z

This change fixes a memory access fault occurring during OpenMP offloading when device_type(nohost) is used with non-Unified Shared Memory (non-USM) offloads. The issue manifested as a ‘Page not present’ error on AMD GPUs or an ‘illegal memory access’ on NVIDIA GPUs. The solution involves mapping the variable ‘x’ for the OpenMP ‘target’ construct, ensuring that data is correctly accessible on the device for non-USM scenarios.