macos-14 loads FLUX.2-klein-4B Q2_K natively on mps and then dies on the first
generation with exit code -6:
ggml_metal_op_encode_impl: error: unsupported op 'RMS_NORM' -> ggml_abort
LLMEmbedder::encode_prompt -> LLMRunner::compute -> GGMLRunner::compute
ggml's Metal backend gates RMS_NORM on contiguous rows and aborts the process
when that does not hold, with no per-op CPU fallback, so any LLM text encoder
(Qwen3 for FLUX.2 and Z-Image, T5 for FLUX.1) takes sd-server down. The encoder
runs once per prompt while the DiT runs every step, so pinning only the encoder
keeps Metal for the part that matters. UNSLOTH_DIFFUSION_SD_CPP_METAL_TE_GPU=1
opts back in once ggml grows the kernel.
ca5ae684ad