[https://nvbugs/5628952][fix] avoid cudaFree overlap with cuda graph

[chuangz0]

Summary by CodeRabbit

• Bug Fixes

  • Enhanced memory management during executor initialization to prevent potential resource conflicts and improve stability.

• Tests

  • Removed outdated entries from the integration test waives list to maintain test suite accuracy.

Description

Test Coverage

PR Checklist

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[chuangz0]

/bot run --add-multi-gpu-test

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds garbage collection to the PyExecutor initialization to free memory before constructing the final executor, reducing CUDA graph capture overlap. Simultaneously removes two test entries from the integration test waives list.

Changes

Cohort / File(s)	Summary
Memory optimization in PyExecutor initialization tensorrt_llm/_torch/pyexecutor/py_executor_creator.py	Imports gc module and adds gc.collect() call in the drafting-extra-resources finalization block to prevent CUDA memory overlap with prior allocations during executor construction
Integration test waives list maintenance tests/integration/test_lists/waives.txt	Removes two test entries: TestQwen3_8B::test_nixl_backend and TestDeepSeekV3Lite::test_guided_decoding[xgrammar-mtp_nextn=2] from the disaggregated serving test waives

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is incomplete with placeholder template sections and no substantive content filled in.	Replace @coderabbitai summary placeholder with actual PR title. Complete Description, Test Coverage sections with specific details about the changes and testing approach.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the required template with NVBugs ticket format and [fix] type, clearly describing the main change to avoid CUDA free overlaps with CUDA graphs.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[tensorrt-cicd]

PR_Github #23476 [ run ] triggered by Bot. Commit: 8fc818c

[tensorrt-cicd]

PR_Github #23476 [ run ] completed with state SUCCESS. Commit: 8fc818c
/LLM/release-1.1/L0_MergeRequest_PR pipeline #402 completed with status: 'FAILURE'

[chuangz0]

/bot run --add-multi-gpu-test

[tensorrt-cicd]

PR_Github #23508 [ run ] triggered by Bot. Commit: e409ad3

[tensorrt-cicd]

PR_Github #23508 [ run ] completed with state SUCCESS. Commit: e409ad3
/LLM/release-1.1/L0_MergeRequest_PR pipeline #409 completed with status: 'FAILURE'

[chuangz0]

/bot run --add-multi-gpu-test

[tensorrt-cicd]

PR_Github #23599 [ run ] triggered by Bot. Commit: 01748d1

[tensorrt-cicd]

PR_Github #23599 [ run ] completed with state SUCCESS. Commit: 01748d1
/LLM/release-1.1/L0_MergeRequest_PR pipeline #426 completed with status: 'FAILURE'

[chuangz0]

/bot run --add-multi-gpu-test

[tensorrt-cicd]

PR_Github #23639 [ run ] triggered by Bot. Commit: 6e7cb4a