[https://nvbugs/5800646][fix] Fix hang issue by avoid exposing UB buf…

[liji-nv]

…fer out of graph

Summary by CodeRabbit

• New Features

  • Enhanced compilation optimization patterns for residual normalization operations with improved tensor handling

• Tests

  • Re-enabled test coverage for model configurations across multiple GPU setups to expand quality assurance

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Description

Test Coverage

PR Checklist

Please review the following before submitting your PR:

• PR description clearly explains what and why. If using CodeRabbit's summary, please make sure it makes sense.

• PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.

• Test cases are provided for new code paths (see test instructions)

• Any new dependencies have been scanned for license and vulnerabilities

• CODEOWNERS updated if ownership changes

• Documentation updated as needed

• Update tava architecture diagram if there is a significant design change in PR.

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[liji-nv]

/bot run --stage_list "DGX_H200-4_GPUs-PyTorch-Post-Merge-1"

[liji-nv]

/bot run --stage_list "DGX_H200-4_GPUs-PyTorch-Post-Merge-1, DGX_B200-4_GPUs-PyTorch-Post-Merge-1"

[coderabbitai]

📝 Walkthrough

Walkthrough

Two changes are introduced: a new pattern matching function for AllReduce graph output handling in the compilation system, and removal of test skip markers for DeepSeekV3Lite bfloat16 configurations to enable previously gated test cases.

Changes

Cohort / File(s)	Summary
Pattern Matching Enhancement tensorrt_llm/_torch/compilation/patterns/ar_residual_norm.py	Introduces insert_copy_for_graph_output() function to insert copy operations for AllReduce outputs, ensuring non-UB semantics are preserved when outputs connect to graph outputs. Includes pattern matching verification and integration into UB pattern registration pipeline.
Test Configuration Updates tests/integration/test_lists/waives.txt	Removes three SKIP markers for DeepSeekV3Lite bfloat16 4-GPU test configurations (ep4, tp4, and variants), enabling these previously gated test cases to run.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.
Description check	⚠️ Warning	The PR description is largely incomplete and does not follow the required template structure.	Fill in the 'Description' section with a clear explanation of the issue and solution, and specify relevant test(s) in the 'Test Coverage' section that validate the changes.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the correct NVBugs format with issue reference [https://nvbugs/5800646], type [fix], and clearly summarizes the main change: fixing a hang issue by avoiding exposure of UB buffer out of graph.

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✨ Finishing touches

• 📝 Generate docstrings

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[tensorrt-cicd]

PR_Github #32746 Bot args parsing error: usage: /bot [-h]
{run,kill,skip,submit,reviewers,reuse-pipeline,reuse-review} ...
/bot: error: unrecognized arguments: --stage_list DGX_H200-4_GPUs-PyTorch-Post-Merge-1, DGX_B200-4_GPUs-PyTorch-Post-Merge-1

[liji-nv]

/bot run --stage-list "DGX_H200-4_GPUs-PyTorch-Post-Merge-1, DGX_B200-4_GPUs-PyTorch-Post-Merge-1"

[tensorrt-cicd]

PR_Github #32842 [ run ] triggered by Bot. Commit: 4306f0c

[tensorrt-cicd]

PR_Github #32842 [ run ] completed with state SUCCESS. Commit: 4306f0c
/LLM/release-1.2/L0_MergeRequest_PR pipeline #97 (Partly Tested) completed with status: 'SUCCESS'

[liji-nv]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #32877 [ run ] triggered by Bot. Commit: 4306f0c

[tensorrt-cicd]

PR_Github #32877 [ run ] completed with state SUCCESS. Commit: 4306f0c
/LLM/release-1.2/L0_MergeRequest_PR pipeline #104 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

[liji-nv]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #32952 [ run ] triggered by Bot. Commit: a49e02c

[tensorrt-cicd]

PR_Github #32952 [ run ] completed with state SUCCESS. Commit: a49e02c
/LLM/release-1.2/L0_MergeRequest_PR pipeline #121 completed with status: 'FAILURE'

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

[liji-nv]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #33141 [ run ] triggered by Bot. Commit: cba2fd5

[tensorrt-cicd]

PR_Github #33141 [ run ] completed with state SUCCESS. Commit: cba2fd5
/LLM/release-1.2/L0_MergeRequest_PR pipeline #159 completed with status: 'FAILURE'

⚠️ Action Required:

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[liji-nv]

/bot run

[tensorrt-cicd]

PR_Github #33307 [ run ] triggered by Bot. Commit: cba2fd5

[tensorrt-cicd]

PR_Github #33307 [ run ] completed with state SUCCESS. Commit: cba2fd5
/LLM/release-1.2/L0_MergeRequest_PR pipeline #193 completed with status: 'FAILURE'

⚠️ Action Required:

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[liji-nv]

/bot run

[tensorrt-cicd]

PR_Github #33376 [ run ] triggered by Bot. Commit: cba2fd5

[tensorrt-cicd]

PR_Github #33376 [ run ] completed with state SUCCESS. Commit: cba2fd5
/LLM/release-1.2/L0_MergeRequest_PR pipeline #205 completed with status: 'FAILURE'

⚠️ Action Required:

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[liji-nv]

/bot run

[tensorrt-cicd]

PR_Github #33503 [ run ] triggered by Bot. Commit: cba2fd5

[tensorrt-cicd]

PR_Github #33503 [ run ] completed with state DISABLED
CI server is currently disabled for scheduled maintenance. Estimated completion time: 7 PM PST on 1/25.

[liji-nv]

/bot run

[tensorrt-cicd]

PR_Github #33512 [ run ] triggered by Bot. Commit: cba2fd5

[tensorrt-cicd]

PR_Github #33512 [ run ] completed with state SUCCESS. Commit: cba2fd5
/LLM/release-1.2/L0_MergeRequest_PR pipeline #221 completed with status: 'FAILURE'

⚠️ Action Required:

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[liji-nv]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #33534 [ run ] triggered by Bot. Commit: 9b9d468

[tensorrt-cicd]

PR_Github #33534 [ run ] completed with state SUCCESS. Commit: 9b9d468
/LLM/release-1.2/L0_MergeRequest_PR pipeline #224 completed with status: 'FAILURE'

⚠️ Action Required:

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[liji-nv]

/bot run

[tensorrt-cicd]

PR_Github #33700 [ run ] triggered by Bot. Commit: 9b9d468

[tensorrt-cicd]

PR_Github #33700 [ run ] completed with state SUCCESS. Commit: 9b9d468
/LLM/release-1.2/L0_MergeRequest_PR pipeline #239 completed with status: 'SUCCESS'