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llama-graph: fix null-buffer crash in llm_graph_input_attn_kv_iswa for SWA-only models #23131

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Merged
ggerganov merged 1 commit into from
May 21, 2026
Merged

llama-graph: fix null-buffer crash in llm_graph_input_attn_kv_iswa for SWA-only models #23131

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37 changes: 25 additions & 12 deletions src/llama-graph.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -500,15 +500,21 @@ bool llm_graph_input_attn_k::can_reuse(const llm_graph_params & params) {
}

void llm_graph_input_attn_kv_iswa::set_input(const llama_ubatch * ubatch) {
mctx->get_base()->set_input_k_idxs(self_k_idxs, ubatch);
mctx->get_base()->set_input_v_idxs(self_v_idxs, ubatch);
// base tensors may not be allocated if there are no non-SWA attention layers
if (self_k_idxs && self_k_idxs->buffer) {
mctx->get_base()->set_input_k_idxs(self_k_idxs, ubatch);
mctx->get_base()->set_input_v_idxs(self_v_idxs, ubatch);

mctx->get_base()->set_input_kq_mask(self_kq_mask, ubatch, cparams.causal_attn);
mctx->get_base()->set_input_kq_mask(self_kq_mask, ubatch, cparams.causal_attn);
}

mctx->get_swa()->set_input_k_idxs(self_k_idxs_swa, ubatch);
mctx->get_swa()->set_input_v_idxs(self_v_idxs_swa, ubatch);
// swa tensors may not be allocated if there are no SWA attention layers
if (self_k_idxs_swa && self_k_idxs_swa->buffer) {
mctx->get_swa()->set_input_k_idxs(self_k_idxs_swa, ubatch);
mctx->get_swa()->set_input_v_idxs(self_v_idxs_swa, ubatch);

mctx->get_swa()->set_input_kq_mask(self_kq_mask_swa, ubatch, cparams.causal_attn);
mctx->get_swa()->set_input_kq_mask(self_kq_mask_swa, ubatch, cparams.causal_attn);
}

if (self_k_rot) {
mctx->get_base()->set_input_k_rot(self_k_rot);
Expand All @@ -534,14 +540,21 @@ bool llm_graph_input_attn_kv_iswa::can_reuse(const llm_graph_params & params) {

bool res = true;

res &= self_k_idxs->ne[0] == params.ubatch.n_tokens;
//res &= self_v_idxs->ne[0] == params.ubatch.n_tokens; // TODO: need to move this to the unified cache and check there
// base tensors may not be allocated if there are no non-SWA attention layers
if (self_k_idxs && self_k_idxs->buffer) {
res &= self_k_idxs->ne[0] == params.ubatch.n_tokens;
//res &= self_v_idxs->ne[0] == params.ubatch.n_tokens; // TODO: need to move this to the unified cache and check there

res &= self_k_idxs_swa->ne[0] == params.ubatch.n_tokens;
//res &= self_v_idxs_swa->ne[0] == params.ubatch.n_tokens; // TODO: need to move this to the unified cache and check there
res &= can_reuse_kq_mask(self_kq_mask, mctx->get_base(), params.ubatch, params.cparams);
}

res &= can_reuse_kq_mask(self_kq_mask, mctx->get_base(), params.ubatch, params.cparams);
res &= can_reuse_kq_mask(self_kq_mask_swa, mctx->get_swa(), params.ubatch, params.cparams);
// swa tensors may not be allocated if there are no SWA attention layers
if (self_k_idxs_swa && self_k_idxs_swa->buffer) {
res &= self_k_idxs_swa->ne[0] == params.ubatch.n_tokens;
//res &= self_v_idxs_swa->ne[0] == params.ubatch.n_tokens; // TODO: need to move this to the unified cache and check there

res &= can_reuse_kq_mask(self_kq_mask_swa, mctx->get_swa(), params.ubatch, params.cparams);
}

return res;
}
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