[https://nvbugs/5769890][fix] enable system memory to transfer active message in NIXL ucx (cherry-pick from https://github.com/NVIDIA/TensorRT-LLM/pull/10602)

[yuxianq]

Summary by CodeRabbit

• Tests
  • Enhanced test coverage for disaggregated serving with improved error handling
  • Backend-aware test configurations for deployment scenarios
  • Reactivated previously skipped integration tests for expanded coverage

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Description

Test Coverage

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[yuxianq]

/bot run --disable-fail-fast --add-multi-gpu-test

[coderabbitai]

📝 Walkthrough

Walkthrough

The changes add UCX (Unified Collective Communication) environment variable configurations across disaggregated test files to enhance memory error handling and transport settings for backend-specific behavior and NVLink detection during test execution.

Changes

Cohort / File(s)	Summary
Disaggregated test environment setup tests/integration/defs/disaggregated/test_disaggregated.py, tests/integration/defs/disaggregated/test_disaggregated_single_gpu.py, tests/integration/defs/accuracy/test_disaggregated_serving.py	Adds UCX_MM_ERROR_HANDLING="y" environment variable across multiple disaggregated test entry points and server configurations. In test_disaggregated_serving.py, introduces backend-aware logic (checking for NIXL backend) and conditional UCX_TLS settings for NVLink detection. In the other two files, adds the same memory error-handling setting to existing environment configurations for test runners and MPI pool executors.
Test skip list updates tests/integration/test_lists/waives.txt	Removes 3 lines containing test skip entries, reducing the number of tests marked as skipped in disaggregated test configurations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is mostly empty - it contains only the template structure with uncommented sections (Description, Test Coverage) left blank and no actual explanation of the issue or test coverage details provided.	Add detailed description of the issue being fixed and list the relevant tests (test_disaggregated.py, test_disaggregated_single_gpu.py, test_accuracy/test_disaggregated_serving.py) that validate these UCX environment variable changes.
Docstring Coverage	⚠️ Warning	Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title properly follows the template format [NVBugs ID][type] with a clear, specific summary of the change - enabling system memory for active message transfer in NIXL UCX, and notes it's a cherry-pick from upstream PR.

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[tensorrt-cicd]

PR_Github #33109 [ run ] triggered by Bot. Commit: 125f7d2

[tensorrt-cicd]

PR_Github #33109 [ run ] completed with state SUCCESS. Commit: 125f7d2
/LLM/release-1.2/L0_MergeRequest_PR pipeline #155 completed with status: 'FAILURE'

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[yuxianq]

/bot run --disable-fail-fast --add-multi-gpu-test

[tensorrt-cicd]

PR_Github #33249 [ run ] triggered by Bot. Commit: 125f7d2

[tensorrt-cicd]

PR_Github #33249 [ run ] completed with state ABORTED. Commit: 125f7d2
LLM/release-1.2/L0_MergeRequest_PR #183 (Blue Ocean) completed with status: ABORTED

[ZhanruiSunCh]

/bot run --disable-fail-fast --add-multi-gpu-test

[tensorrt-cicd]

PR_Github #33292 [ run ] triggered by Bot. Commit: ce7fcc9

[tensorrt-cicd]

PR_Github #33292 [ run ] completed with state SUCCESS. Commit: ce7fcc9
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⚠️ Action Required:

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[yuxianq]

/bot run --disable-fail-fast --add-multi-gpu-test

[tensorrt-cicd]

PR_Github #33382 [ run ] triggered by Bot. Commit: 67117cf

[tensorrt-cicd]

PR_Github #33382 [ run ] completed with state SUCCESS. Commit: 67117cf
/LLM/release-1.2/L0_MergeRequest_PR pipeline #207 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
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[yuxianq]

/bot run --disable-fail-fast --add-multi-gpu-test

[tensorrt-cicd]

PR_Github #33425 [ run ] triggered by Bot. Commit: 67117cf

[tensorrt-cicd]

PR_Github #33425 [ run ] completed with state ABORTED. Commit: 67117cf
LLM/release-1.2/L0_MergeRequest_PR #215 (Blue Ocean) completed with status: ABORTED

[yuxianq]

/bot run --disable-fail-fast --add-multi-gpu-test

[tensorrt-cicd]

PR_Github #33437 [ run ] triggered by Bot. Commit: 67117cf

[tensorrt-cicd]

PR_Github #33437 [ run ] completed with state SUCCESS. Commit: 67117cf
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[yuxianq]

/bot reuse-pipeline

[tensorrt-cicd]

PR_Github #33520 [ reuse-pipeline ] triggered by Bot. Commit: aa4e537

[tensorrt-cicd]

PR_Github #33520 [ reuse-pipeline ] completed with state SUCCESS. Commit: aa4e537
Reusing PR_Github #33437 for commit aa4e537