[jh-nv]

Overview

Bump the NIXL pin from 1.5.0 to 1.5.1 for both CUDA 13 (requirements/kv_connectors.txt) and CUDA 12 (requirements/kv_connectors_cu12.txt) images.

Claims

• CUDA 12 and CUDA 13 images both install NIXL 1.5.1. The two pins move together; last time they drifted ([NIXL] Bump NIXL version to 1.5.0 #56907, then [NIXL] Bump CUDA 12 NIXL to 1.5.0 #60428 a week later).
• Picks up the LIBFABRIC fix for context-independent CUDA allocations such as mapped VMM memory (fix(libfabric): fall back for context-independent CUDA allocations ai-dynamo/nixl#2425).
• The UCX path and NIXL EP do not change. release/1.5.0...v1.5.1 touches only version strings, attributions, src/plugins/libfabric/libfabric_backend.cpp and contrib/Dockerfile.manylinux (libfabric 1.21.0 → 2.7.0). UCX stays at the same pinned commit (65e342a8).

Validation

• Dependency resolution, x86_64 and aarch64, both files: nixl, nixl-cu12 and nixl-cu13 all resolve to 1.5.1.

  uv pip compile --python-version 3.12 --python-platform x86_64-manylinux_2_28 --torch-backend cu129 requirements/kv_connectors.txt
  # repeated for aarch64-manylinux_2_28 and requirements/kv_connectors_cu12.txt

• pre-commit run --files requirements/kv_connectors.txt requirements/kv_connectors_cu12.txt: passed.
• ELF check of libplugin_LIBFABRIC.so in nixl_cu13 cp312 x86_64: 1.5.0 needs libfabric FABRIC_1.0, 1.1, 1.7; 1.5.1 needs FABRIC_1.0, 1.1, 1.10. Both list libfabric.so.1 as a dependency and do not bundle it.
• Not yet run: GPU P/D serving with NixlConnector on CUDA 12 and CUDA 13, and LIBFABRIC over EFA. This PR stays a draft until those pass. requirements/kv_connectors.txt is in the run-all patterns (.buildkite/ci_config.yaml), so CI runs the NIXL integration and P/D accuracy tests.

AI assistance (Claude Code) was used to prepare this PR.

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Pull Request Checklist

• I used vLLM's /pr-checklist skill. (Mandatory for agents, optional for humans).

• AI assistance was used during the creation of this PR.

• Design Fit: Minimizes impact on core components, reuses existing functionality, and justifies added complexity.

• Testing and Validation: Validates the change and ensures any added tests are meaningful and reliable, with CI coverage or documented CI resource constraints and validation performed outside CI.

• Code Quality and Style: Keeps code and comments clear and concise, and updates relevant documentation and examples.

• Pull Request Contents: Includes a brief summary and relevant links, supports claims with evidence, explains root causes and implementation trade-offs, and follows the contributing guide.

🤖 Generated with Claude Code

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[claude]

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[github-actions]

✅ @jh-nv, CI is now available for this PR.

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[ivanium]

/ci run

[github-actions]

✅ Triggered Buildkite CI #97398 for commit 7b13f5f053b9.

ℹ️ This PR is 1 commit behind upstream main. Merged upstream main into this branch as 7b13f5f053b9 before starting CI. Pull the branch before pushing more changes.