[https://nvbugs/5680310][fix]Fix ctx only timed out test

[pcastonguay]

Summary by CodeRabbit

• Improvements

  • Enhanced timeout messaging for KV cache transfer operations.

• Tests

  • Updated KV cache transfer backend configuration in test cases.
  • Re-enabled previously excluded test scenario for context-only KV cache exhaustion.

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Description

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[pcastonguay]

/bot run --disable-fail-fast

[coderabbitai[bot]]

📝 Walkthrough

Walkthrough

The changes modify KV cache transfer functionality by updating a timeout log message for clarity, removing a test case from the exclusion list, and reconfiguring two test cases to use the UCX backend for KV cache transfer instead of the default backend.

Changes

Cohort / File(s)	Summary
Timeout log message cpp/tensorrt_llm/batch_manager/cacheTransceiver.cpp	Updated timeout log message in checkContextTransferStatus from "Timed out waiting for context transfer for request %ld after %d milliseconds." to "Timed out waiting for context KV cache transfer after %d milliseconds." to remove request ID and generalize the message.
Test exclusion removal tests/integration/test_lists/waives.txt	Removed SKIP entry for unittest/llmapi/test_llm_pytorch.py::test_llm_context_only_timed_out_kv_cache_exhausted, enabling the test to run.
Backend configuration tests/unittest/llmapi/test_llm_pytorch.py	Updated two test cases to use UCX backend for KV cache transfer instead of DEFAULT backend, while maintaining kv_transfer_timeout_ms=1000.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• All changes are straightforward configuration or logging adjustments with no complex logic modifications
• Test backend migration follows a consistent pattern across two test cases
• No behavioral changes to core functionality, only message wording and test configuration

Pre-merge checks and finishing touches

❌ 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%.	You can run @coderabbitai generate docstrings to improve docstring coverage.
Description check	⚠️ Warning	The PR description is largely empty, containing only the template structure with no actual information about the issue, solution, or test coverage filled in.	Fill in the Description section explaining the issue and solution, provide Test Coverage details listing relevant tests, and ensure all required sections are completed with substantive content.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the required format [ticket][type] and clearly describes the main change: fixing a context-only timed-out test related to KV cache functionality.

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[tensorrt-cicd]

PR_Github #25567 [ run ] triggered by Bot. Commit: eed02da

[tensorrt-cicd]

PR_Github #25567 [ run ] completed with state SUCCESS. Commit: eed02da /LLM/main/L0_MergeRequest_PR pipeline #19364 completed with status: 'FAILURE'

[pcastonguay]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #25758 [ run ] triggered by Bot. Commit: eed02da

[tensorrt-cicd]

PR_Github #25758 [ run ] completed with state SUCCESS. Commit: eed02da /LLM/main/L0_MergeRequest_PR pipeline #19533 completed with status: 'FAILURE'

[pcastonguay]

@chuangz0 could you please review? When using NIXL as backend, the test shows a seg fault on shutdown, so I switched to UCX for this test.

[pcastonguay]

/bot run --disable-fail-fast

[pcastonguay]

/bot run --disable-fail-fast

[pcastonguay]

/bot kill

[pcastonguay]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #25886 [ kill ] triggered by Bot. Commit: eed02da

[tensorrt-cicd]

PR_Github #25886 [ kill ] completed with state SUCCESS. Commit: eed02da Successfully killed previous jobs for commit eed02da

[tensorrt-cicd]

PR_Github #25887 [ run ] triggered by Bot. Commit: eed02da

[tensorrt-cicd]

PR_Github #25887 [ run ] completed with state SUCCESS. Commit: eed02da /LLM/main/L0_MergeRequest_PR pipeline #19631 completed with status: 'SUCCESS'