mirror of
https://github.com/ggml-org/llama.cpp.git
synced 2026-07-08 04:00:22 +00:00
liminfei-amd
4b2a0cdee1
Tensor parallelism (-sm tensor) combined with -ncmoe (CPU-offloaded MoE
experts) aborts during warm-up on MoE models with
GGML_ASSERT(ggml_is_contiguous(tensor)) in ggml-backend-meta.cpp.
The failing tensor is the MoE router output (ffn_moe_topk): it is mirrored
(GGML_BACKEND_SPLIT_AXIS_MIRRORED, replicated across backends since routing
must be identical) and happens to be a non-contiguous view.
ggml_backend_meta_buffer_{get,set}_tensor asserted contiguity before
consulting the split state, so a mirrored non-contiguous tensor tripped the
assert even though the GGML_BACKEND_SPLIT_AXIS_MIRRORED case right below
already handles it.
Move the split-state lookup above the assert and allow the mirrored case in
both get_tensor and set_tensor.
Diagnosis credit to the reporter (@nathanmp).
Fixes #24886
Signed-off-by: liminfei-amd <91481003+liminfei-amd@users.noreply.github.com>