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[https://nvbugs/6892484][fix] Port of the 6791675 fix to release/1.3: RemoteTask gains sys_path, the… - #20058
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cascade812 merged 2 commits intoOct 14, 2026
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughMPI task submissions now include the client’s ChangesMPI task import paths
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Client as RemoteMpiCommSessionClient
participant Server as RemoteMpiCommSessionServer
participant Wrapper as task_wrapper
participant Task as Submitted task
Client->>Server: Submit RemoteTask with sys.path
Server->>Wrapper: Pass sys_path and task
Wrapper->>Wrapper: Add absent absolute paths
Wrapper->>Task: Run task
Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 16 functions across 5 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title follows the required ticket and type format and clearly describes the sys.path fix being ported to release/1.3. Description check The description explains the root cause, solution, bug reference, reproduction results, and test plan. It uses different headings from the template but provides the required information. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Review comments at @tensorrt_llm/llmapi/mpi_session.py:
- Around line 974-975: RemoteTask.sys_path is applied only after its serialized
arguments have been deserialized, so client-only argument types can fail to
import first. Update the RemoteTask transport and the server and MPI receive
paths to make the client path available before deserializing the task payload;
keep task_wrapper’s execution behavior intact.
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📒 Files selected for processing (4)
tensorrt_llm/llmapi/mpi_session.pytests/unittest/llmapi/_mpi_session_test_tasks.pytests/unittest/llmapi/_run_mpi_comm_task.pytests/unittest/llmapi/test_mpi_session.py
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…iven MPI ranks on release/1.3 Port of the main-branch fix for nvbugs/6791675 (443ebf7, 8ff3c54). Under trtllm-llmapi-launch the LLM talks to the launcher-started ranks through RemoteMpiCommSessionClient/Server, which never forwarded the client's sys.path. Ranks (rank 0 inside mgmn_leader_node included) then failed to unpickle a per-request payload whose class lives outside the installed packages, e.g. ForceTokenLogitsProcessor from defs.accuracy.accuracy_core in accuracy/test_glm52.py::TestGLM52NVFP4:: test_runtime, with "ModuleNotFoundError: No module named 'defs'". MpiPoolSession is unaffected because it passes MPIPoolExecutor(path=...). Carry the submitting client's sys.path on RemoteTask and append the absolute entries missing from each rank in task_wrapper before the task runs. Task-wrapper metadata is positional-only so task keyword arguments are forwarded intact. Add two-rank regression coverage for client-only logits processor deserialization and keyword forwarding. Signed-off-by: trtllm-agent <296075020+trtllm-agent@users.noreply.github.com>
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Actionable comments posted: 1
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Inline comments:
Review comments at @tensorrt_llm/llmapi/mpi_session.py:
- Around line 806-807: Update the sys.path construction for RemoteTask in the
task submission flow so relative entries, including empty entries, are resolved
against the client’s current working directory before being sent to the worker;
preserve absolute entries. Add a regression case that imports a client-only
module through a relative sys.path entry.
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review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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📒 Files selected for processing (4)
tensorrt_llm/llmapi/mpi_session.pytests/unittest/llmapi/_run_mpi_comm_task.pytests/unittest/llmapi/test_mpi_server_lifecycle.pytests/unittest/llmapi/test_mpi_session.py
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zhaoyangwang-nvidia
approved these changes
Oct 12, 2026
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Automatically added "ci: full pre-merge approved" because this PR has satisfied the required GitHub review approvals. Unresolved review conversations and other required checks remain independent merge requirements. |
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/bot run |
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PR_Github #77601 [ run ] triggered by Bot. Commit: |
…r remote MPI tasks Resolve relative and empty sys.path entries against the client working directory before sending a RemoteTask, preserving absolute entries. Add client-only module import regressions for both path forms and verify submitted paths without mutating the client import path. Signed-off-by: Guiju Zhang <7135567+cascade812@users.noreply.github.com>
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/bot run |
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enabled auto-merge (squash)
October 14, 2026 00:09
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PR_Github #77615 [ run ] triggered by Bot. Commit: |
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Autofix skipped. No unresolved review comments with fix instructions found. |
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PR_Github #77601 [ run ] completed with state |
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PR_Github #77615 [ run ] completed with state |
1 task done
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Summary
defsto unpickle the request's ForceTokenLogitsProcessor.RemoteTaskgainssys_path, the client sendstuple(sys.path), andtask_wrapper(client_sys_path, task, /, ...)appends missing absolute entries before the barrier and the task. Unit tests added; test criteria unchanged.bash .repair-bot/reproduce/6892484-ee7f5ce2aa2b-1791528607397735662/tot/handoff/driver.shTest plan
Links
Reproduction comparison
Not run: the NVBug report states the failure ToT reproduced (RuntimeError: Remote MPI worker died: ModuleNotFoundError: No module named 'defs')
Signature: RuntimeError: Remote MPI worker died: ModuleNotFoundError: No module named 'defs'
Dev Engineer Review
The available diff shows no change to
mpi_session.pyor the MPI task helpers. The only reported change is formatting intest_mpi_session.py: import formatting and a docstring layout change. No test results or review severity counts were supplied.QA Engineer Review
The available diff does not show added, removed, or modified test cases. It shows formatting-only edits in
tests/unittest/llmapi/test_mpi_session.py. That test file appears in thel0_cpu.ymlandl0_a100.ymlCI lists. Coverage verdict: needs follow-up, because the reported diff does not establish the behavioral changes described in the PR objectives.Per-File QA Perspective
tests/unittest/llmapi/test_mpi_session.py: The shown changes only reformat imports and a docstring. The file is listed in bothtest-db/l0_cpu.ymlandtest-db/l0_a100.yml.