fix(v1): avoid false shutdown failures on clean exit - #41507
fix(v1): avoid false shutdown failures on clean exit#41507ShuhaoZhangTony wants to merge 1 commit into
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Code Review
This pull request introduces a structured shutdown mechanism for the V1 engine, ensuring that resources such as Prometheus, renderers, and distributed process groups are properly released. It also improves the liveness monitoring in MPClient to better differentiate between manual shutdowns and unexpected process crashes. A potential AttributeError was identified in the LLMEngine.shutdown method, as the renderer object may not consistently implement a shutdown method across all configurations.
| if renderer := getattr(self, "renderer", None): | ||
| renderer.shutdown() | ||
| self.renderer = None |
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The renderer object returned by renderer_from_config (typically a subclass of BaseRenderer) does not consistently implement a shutdown() method across all vLLM configurations. Calling renderer.shutdown() directly will raise an AttributeError if the method is missing, which will interrupt the remaining cleanup steps in shutdown() (such as engine_core.shutdown() and dp_group destruction). It is safer to check for the existence of the method before calling it.
| if renderer := getattr(self, "renderer", None): | |
| renderer.shutdown() | |
| self.renderer = None | |
| if renderer := getattr(self, "renderer", None): | |
| if hasattr(renderer, "shutdown"): | |
| renderer.shutdown() | |
| self.renderer = None |
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Pull request overview
This PR targets a shutdown-path bug in the v1 engine stack where clean or externally driven engine teardown could be misreported as an unexpected engine death. It updates both the client-side monitor logic and the legacy LLMEngine cleanup path, and adds focused unit tests around those shutdown behaviors.
Changes:
- Marks
MPClientshutdowns as intentional earlier and gates the unexpected-death log/error path on a real failed process name. - Adds an explicit
LLMEngine.shutdown()path to tear down Prometheus state, renderer, engine core, and owned DP groups. - Adds targeted unit tests for MP client shutdown monitoring and the new
LLMEngine.shutdown()cleanup flow.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
vllm/v1/engine/llm_engine.py |
Adds explicit shutdown handling for legacy sync engine resources. |
vllm/v1/engine/core_client.py |
Adjusts MP client shutdown/monitor behavior to distinguish intentional exits from crashes. |
tests/v1/engine/test_shutdown_cleanup.py |
Adds unit tests covering clean monitor exit handling and explicit engine shutdown cleanup. |
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| if not _self or not _self._finalizer.alive or _self.resources.engine_dead: | ||
| return | ||
| failed_proc_name = getattr(engine_manager, "failed_proc_name", None) | ||
| if failed_proc_name is None: |
| client.start_engine_core_monitor() | ||
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| assert client.resources.engine_dead is False | ||
| client.shutdown.assert_not_called() |
| shutdown_prometheus() | ||
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| if renderer := getattr(self, "renderer", None): | ||
| renderer.shutdown() | ||
| self.renderer = None | ||
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| if engine_core := getattr(self, "engine_core", None): | ||
| engine_core.shutdown(timeout=timeout) | ||
| self.engine_core = None | ||
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| dp_group = getattr(self, "dp_group", None) | ||
| if dp_group is not None and not self.external_launcher_dp: | ||
| stateless_destroy_torch_distributed_process_group(dp_group) | ||
| self.dp_group = None | ||
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CI is currently blocked by the pre-run-check gate requiring a |
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This pull request has merge conflicts that must be resolved before it can be |
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CI note: the current failing |
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- mark MPClient shutdown as intentional before engine teardown\n- ignore clean monitor exits without failed_proc_name noise\n- add an explicit LLMEngine.shutdown path with focused unit tests\n\nCo-authored-by: GitHub Copilot <copilot@github.com> Signed-off-by: shuhao zhang <shuhao_zhang@hust.edu.cn>
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Continued as #49034 on the required |
Summary
MPClient.shutdown()as intentional before tearing down engine processes so the monitor thread does not treat a clean exit as an engine failureLLMEngine.shutdown()cleanup path that tears down renderer, engine core, Prometheus state, and DP groups deterministicallyRelated context
This is aimed at the same user-visible symptom reported in issue #27557: clean or wrapper-driven shutdowns can surface as
Engine core proc ... died unexpectedlyeven when the engine manager is already shutting down.Why this is not duplicate work
I checked for existing upstream work before opening this PR:
gh pr list --repo vllm-project/vllm --state open --search "LLMEngine.shutdown shutdown_prometheus "died unexpectedly""gh pr list --repo vllm-project/vllm --state open --search "MPClient normal shutdown engine_dead failed_proc_name"gh issue list --repo vllm-project/vllm --search ""died unexpectedly" LLMEngine shutdown"These searches found no matching open PR for this cleanup path. There is a related open issue (#27557), but no open PR covering this behavior.
Testing
VLLM_USE_PRECOMPILED=1 ~/.local/bin/uv run --python 3.12 pytest tests/v1/engine/test_shutdown_cleanup.py -q3 passedAI assistance
This PR was prepared with AI assistance using GitHub Copilot. The submitting human reviewed the changed lines and the test result before opening the PR.