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[Bugfix][EngineCore] Handle malformed ADD frames and input thread failures - #58481
HritickGokul wants to merge 1 commit into
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Drop undecodable ADD frames without stopping request processing, and propagate unexpected input socket thread failures to the engine fatal-error path. Fixes vllm-project#58445 Co-authored-by: OpenAI Codex <noreply@openai.com> Signed-off-by: Hrithick Gokul Yeddula <gokulysai@gmail.com>
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@njhill Could you review this @WoosukKwon, a second review from you would also be appreciated. |
| if request_type == EngineCoreRequestType.ADD: | ||
| req: EngineCoreRequest = add_request_decoder.decode(data_frames) | ||
| req = _decode_add_request(add_request_decoder, data_frames) | ||
| if req is None: |
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Why is it necessary to add this edge case in here?
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@blueberry808 This is needed at the decoder boundary because add_request_decoder.decode(data_frames) runs before the existing preprocessing try block. A malformed typed ADD frame can raise msgspec.ValidationError there, which terminates the daemon input-socket thread; the core process then stays alive but stops accepting requests. _decode_add_request turns that failure into a logged drop, and if req is None: continue lets the thread process subsequent frames. The regression test uses the real MsgpackDecoder with an invalid float token ID, then verifies that the same decoder successfully handles the next valid frame. This protects the engine-core boundary even if frontend validation is bypassed or incomplete.
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Oh okay, thanks for clarifying that for me
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Summary
Fixes #58445.
An undecodable typed
ADDrequest could raise outside the protected preprocessing path and terminate the EngineCore input socket thread. The core process would remain alive but stop accepting requests, while health checks could continue reporting success.Changes
ADDrequests.INPUT_THREAD_FAILEDevent for unexpected input socket thread failures.This is not a duplicate of #55771. That PR validates frontend
prompt_token_ids; this change protects the EngineCore socket boundary even when malformed data reaches the engine.Tests
.venv/bin/python -m pytest \ tests/v1/engine/test_preprocess_error_handling.py \ -k 'decode_error or input_socket_thread_failure' -vAI assistance
AI assistance was used to investigate the issue, implement the change, and prepare the tests. I reviewed every changed line and the validation results.