June 2026 monthly summary for DarkLight1337/vllm focused on stability and correctness in distributed hidden-state handling for hybrid attention models. A critical bug fix resolved NaN values in hidden states by correctly identifying the hidden-states layer group and updating the KV cache tracking to include HiddenStateCacheSpec in block allocation tracking. This ensures robust handling of hidden state caches during distributed KV transfers, reducing runtime errors and improving reliability for distributed inference and training.

Month: 2026-05 | Delivered enhancements to jeejeelee/vllm focused on speculative decoding improvements and safety guards. Key accomplishments include adding PEagle speculator support in vLLM with new configurations and tests to ensure correctness and performance, and implementing a guard in VllmConfig to prevent parallel drafting unsupported features in EagleSpeculator v2. These changes pave the way for higher throughput and more reliable speculative decoding in production, with maintainable code changes and clear ownership.