5b2b8dcc2a05e24938f24ceefe8cee895dacd140
Root cause: xformers.py only routed head_size>128 through _run_sdpa_fallback. For head_size<=128, xops.memory_efficient_attention_forward(op=FwOp()) dispatched to ixformer varlen_fwd with incompatible 20-arg signature, crashing during determine_num_available_blocks profiling. Fix: use _run_sdpa_fallback for ALL head sizes during prefill.
project_6
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