[CI] De-flake Language Models Test (Extended Generation) test_models(False-False-5-32-bigcode/starcoder2-3b)#42392
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DarkLight1337 merged 1 commit intoMay 12, 2026
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bigcode/starcoder2-3b fails models/language/generation/test_common.py on L4 (SM 8.9). The failure is on Test1, an open-ended NL prompt fed to a code-completion model. After 8 matched tokens the model wanders into a Jupyter notebook markdown id and lands in a near-uniform digit-token logit region; HF and vLLM disagree on which digit lands in top-5 by ~1 logprob bit, so `output_id_0 in logprobs_elem_1` fails. Replace Test1 only for bigcode/starcoder2-3b with a code prompt that keeps the model on its training distribution and produces sharp top-1 logits at every position. Other models are unchanged. Verified locally on GB10: both parametrizations PASS in ~95s each. Signed-off-by: haosdent <haosdent@gmail.com>
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This pull request updates the common generation tests in tests/models/language/generation/test_common.py to specifically handle the bigcode/starcoder2-3b model. It replaces a natural language prompt with a code-based prompt to mitigate test instability caused by logit drift between Hugging Face and vLLM implementations. I have no feedback to provide as there were no review comments.
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…False-False-5-32-bigcode/starcoder2-3b) (vllm-project#42392) Signed-off-by: haosdent <haosdent@gmail.com>
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Purpose
Fix the long-standing CI failure for
bigcode/starcoder2-3bintests/models/language/generation/test_common.pyon L4 (SM 8.9). Tracked in #37304 and #42336; #42336 narrows the regression window to08bfedc15..2488d1dcwhich contains #34644 (PyTorch 2.10 → 2.11)Test1 is an open-ended NL prompt fed to a code-completion model. After ~8 matched tokens starcoder2-3b wanders into a Jupyter-style markdown id and lands in a near-uniform digit-token logit region; HF↔vLLM bf16 drift over 30 layers reorders top-K by one logprob bit, so
output_id_0 in logprobs_elem_1fails. Replace Test1 only for this model with a code prompt that keeps it on its training distribution; other models are unchanged.Recent failing daily/nightly runs (all on L4): #65678, #65498, #65468, #65423, #65378, #65324, #65246, #65099, #65033, #64859, #64792.
Test Plan
Test Result