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Revert "[Bugfix] mamba: run single-token extends as decodes (#42430)"#43176

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Revert "[Bugfix] mamba: run single-token extends as decodes (#42430)"#43176
khluu wants to merge 1 commit into
vllm-project:mainfrom
khluu:revert-mamba-single-token-extends

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@khluu
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@khluu khluu commented May 20, 2026

Summary

  • Reverts commit 47829b1 ([Bugfix] mamba: run single-token extends as decodes (#42430)) to investigate test regressions.

Test plan

  • Run Hybrid SSM NixlConnector PD accuracy tests (4 GPUs) on Buildkite to verify this revert fixes the failure.

@mergify mergify Bot added v1 bug Something isn't working kv-connector labels May 20, 2026
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Code Review

This pull request removes the logic that automatically converted single-token Mamba prefills with prior state into decodes within the _compute_common_metadata method. Consequently, the MockMambaBuilder utility and several associated unit tests that relied on this behavior have been deleted or refactored to use a local _ConcreteMambaBuilder for testing persistent buffer allocations. I have no feedback to provide as there were no review comments.

@haosdent
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I also have a proposal to fix the CI failure without reverting at #43186

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