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With GGML_BACKEND_DL=ON no backend is registered until something calls ggml_backend_load_all(). Every example does; the tests never did, so whisper_init_* and parakeet_init_* ran with devices = 0 and aborted on GGML_ASSERT(device) in ggml_backend_dev_backend_reg. Three tests aborted on such a build - test-whisper-zero-samples, test-vad and test-parakeet - taking ctest -L gh to 2 of 4. test-vad-full has the same fault and reaches it only once a real base.en model is present. No workflow caught this because none pairs the two: build-clang, build-gcc and build-sanitize run ctest -L gh but never set GGML_BACKEND_DL, while release.yml sets it and runs no tests. ggml_backend_load_all() is already reachable through whisper.h and parakeet.h via ggml-cpu.h, so no new include is needed. Resolves: https://github.com/ggml-org/whisper.cpp/issues/4030