Fix overflow indexing in causal_conv1d kernel (#20938)

Signed-off-by: Thomas Parnell <tpa@zurich.ibm.com>

Fix overflow indexing in causal_conv1d kernel (#20938)
Signed-off-by: Thomas Parnell <tpa@zurich.ibm.com>
86f3ac21 · Thomas Parnell · GitHub · 149f2435 · 86f3ac21
Unverified Commit 86f3ac21 authored Jul 14, 2025 by Thomas Parnell Committed by GitHub Jul 14, 2025
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vllm/model_executor/layers/mamba/ops/causal_conv1d.py vllm/model_executor/layers/mamba/ops/causal_conv1d.py +2 -1

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--- a/vllm/model_executor/layers/mamba/ops/causal_conv1d.py
+++ b/vllm/model_executor/layers/mamba/ops/causal_conv1d.py
@@ -92,7 +92,8 @@ def _causal_conv1d_fwd_kernel(  # continuous batching
    if IS_CONTINUOUS_BATCHING:
        # cache_idx
-        conv_state_batch_coord = tl.load(conv_state_indices_ptr + idx_seq)
+        conv_state_batch_coord = tl.load(conv_state_indices_ptr + idx_seq).to(
+            tl.int64)
    else:
        # cache_idx
        conv_state_batch_coord = idx_seq