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[Bugfix] Workaround for DeepSeek V4 MTP=1 hang issue #41168

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[Bugfix] Workaround for DeepSeek V4 MTP=1 hang issue #41168

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8 changes: 8 additions & 0 deletions vllm/v1/attention/backends/mla/indexer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -164,6 +164,10 @@ def get_name() -> str:
def get_supported_kernel_block_sizes() -> list[int | MultipleOf]:
return [256]

@staticmethod
def get_builder_cls() -> type["DeepseekV32IndexerMetadataBuilder"]:
return DeepseekV4IndexerMetadataBuilder


@dataclass
class DeepseekV32IndexerPrefillChunkMetadata:
Expand Down Expand Up @@ -638,6 +642,10 @@ def build(
return attn_metadata


class DeepseekV4IndexerMetadataBuilder(DeepseekV32IndexerMetadataBuilder):
natively_supported_next_n_fp4: list[int] = [1]


def build_prefill_chunk_metadata(
start_idx: int,
end_idx: int,
Expand Down
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