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@njhill njhill commented Jun 13, 2025

dump_engine_exception() is intended to dump pertinent state for diagnostic purposes when model_executor.execute_model() raises an error.

We should be catching Exception rather than BaseException here because a non-Exception implies failure due to some external signal such as SystemExit or KeyboardInterrupt.

Catching SystemExit here has lead to more confusing behaviour when diagnosing problems.

dump_engine_exception is intended to dump pertinent state for diagnostic purposes when model_executor.execute_model() raises an error.

We should be catching Exception rather than BaseException here because a non-Exception implies failure due to some external signal such as `SystemExit` or `KeyboardInterrupt`.

Catching SystemExit here has lead to more confusing behaviour when diagnosing problems.

Signed-off-by: Nick Hill <nhill@redhat.com>
@njhill njhill added the bug Something isn't working label Jun 13, 2025
@njhill njhill requested a review from alexm-redhat as a code owner June 13, 2025 21:40
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Summary of Changes

Hello @njhill, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the error handling for the execute_model function to ensure that diagnostic information is only dumped when an actual execution error occurs, rather than when the process receives a system signal. By changing the caught exception type from BaseException to Exception, we avoid triggering the dump for non-error interruptions like SystemExit, making debugging clearer.

Highlights

  • Exception Handling Scope: I've narrowed the scope of exceptions caught around the execute_model call and within the dump_engine_exception utility from BaseException to Exception.
  • Bug Fix: This change fixes a bug where system signals like SystemExit or KeyboardInterrupt were being caught by the error dumping mechanism, leading to confusing diagnostic output.
  • Improved Logging: In dump_engine_exception, I've slightly improved the logging format and switched to logger.exception for reporting errors that occur during the dumping process itself, providing more context.
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@mergify mergify bot added the v1 label Jun 13, 2025
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Code Review

This PR correctly refines exception handling by changing BaseException to Exception in critical error handling paths. This is an important improvement as it prevents the application from inadvertently suppressing system-level signals like SystemExit or KeyboardInterrupt, leading to more robust behavior and clearer diagnostics. The move to logger.exception in dump_input.py also enhances debuggability by providing full tracebacks. These changes improve the overall stability and maintainability of the error handling mechanisms.

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LGTM

@mgoin mgoin enabled auto-merge (squash) June 16, 2025 04:47
@github-actions github-actions bot added the ready ONLY add when PR is ready to merge/full CI is needed label Jun 16, 2025
@mgoin mgoin merged commit ee35e96 into vllm-project:main Jun 16, 2025
76 checks passed
@njhill njhill deleted the nocatch-systemexit branch June 16, 2025 15:59
yeqcharlotte pushed a commit to yeqcharlotte/vllm that referenced this pull request Jun 22, 2025
minpeter pushed a commit to minpeter/vllm that referenced this pull request Jun 24, 2025
…llm-project#19626)

Signed-off-by: Nick Hill <nhill@redhat.com>
Signed-off-by: minpeter <kali2005611@gmail.com>
yangw-dev pushed a commit to yangw-dev/vllm that referenced this pull request Jun 24, 2025
…llm-project#19626)

Signed-off-by: Nick Hill <nhill@redhat.com>
Signed-off-by: Yang Wang <elainewy@meta.com>
xjpang pushed a commit to xjpang/vllm that referenced this pull request Jun 30, 2025
wseaton pushed a commit to wseaton/vllm that referenced this pull request Jun 30, 2025
avigny pushed a commit to avigny/vllm that referenced this pull request Jul 31, 2025
…llm-project#19626)

Signed-off-by: Nick Hill <nhill@redhat.com>
Signed-off-by: avigny <47987522+avigny@users.noreply.github.com>
googlercolin pushed a commit to googlercolin/vllm that referenced this pull request Aug 29, 2025
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