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[BUGFIX] Fix degenerate strides in TRTLLM query tensors for FlashInfer backend. Fixes issue #32353 #32417

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Merged
pavanimajety merged 2 commits into from
Jan 19, 2026
+10 −4
Merged

[BUGFIX] Fix degenerate strides in TRTLLM query tensors for FlashInfer backend. Fixes issue #32353 #32417

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25f37ce
fix 32353
vadiklyutiy Jan 15, 2026
11f479e
Merge branch 'main' into vadim/issue32353
vadiklyutiy Jan 17, 2026
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14 changes: 10 additions & 4 deletions vllm/v1/attention/backends/flashinfer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1385,8 +1385,11 @@ def forward(
)
else:
assert isinstance(attn_metadata.prefill, TRTLLMPrefill)
# prefill_query may be non-contiguous
prefill_query = prefill_query.contiguous()
# prefill_query may be non-contiguous or have degenerate strides
# First ensure memory contiguity, then fix degenerate strides
# with reshape. contiguous() alone doesn't fix degenerate
# strides when a dimension has size 1.
prefill_query = prefill_query.contiguous().reshape(prefill_query.shape)
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workspace_buffer = _get_trtllm_gen_workspace_buffer()
block_tables_prefill = attn_metadata.prefill.block_tables
seq_lens_prefill = attn_metadata.prefill.seq_lens
Expand Down Expand Up @@ -1495,9 +1498,12 @@ def forward(
out=output[:num_decode_tokens],
)
else:
# decode_query may be non-contiguous
# decode_query may be non-contiguous or have degenerate strides
assert isinstance(attn_metadata.decode, TRTLLMDecode)
decode_query = decode_query.contiguous()
# First ensure memory contiguity, then fix degenerate strides
# with reshape. contiguous() alone doesn't fix degenerate
# strides when a dimension has size 1.
decode_query = decode_query.contiguous().reshape(decode_query.shape)
workspace_buffer = _get_trtllm_gen_workspace_buffer()
block_tables_decode = attn_metadata.decode.block_tables
seq_lens_decode = attn_metadata.decode.seq_lens
Expand Down
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