Problem
The hosted address/undefined sanitizer job on PR #524 fails in test_ltx2_video because Ltx2LoadVaeWeights casts StTensor::data to const uint16_t* and indexes it. Safetensors payload offsets are byte offsets and the observed fixture payload starts at an odd address, so the dereference is undefined behavior.
Evidence from Actions run 31737430012, job 94572345351:
src/vllm/model_executor/models/ltx2_loader.cpp:1325- UBSan: load of misaligned address for
const uint16_t, which requires 2-byte alignment
- failing test:
test_ltx2_video
Required outcome
Load each BF16 element without assuming alignment, preserve the exact BF16-to-F32 conversion, add a regression whose tensor payload is deliberately odd-aligned, and pass the focused and full sanitizer gates.
This repair belongs in PR #524 so the release-binary campaign has one fully green integration PR.
Problem
The hosted address/undefined sanitizer job on PR #524 fails in
test_ltx2_videobecauseLtx2LoadVaeWeightscastsStTensor::datatoconst uint16_t*and indexes it. Safetensors payload offsets are byte offsets and the observed fixture payload starts at an odd address, so the dereference is undefined behavior.Evidence from Actions run 31737430012, job 94572345351:
src/vllm/model_executor/models/ltx2_loader.cpp:1325const uint16_t, which requires 2-byte alignmenttest_ltx2_videoRequired outcome
Load each BF16 element without assuming alignment, preserve the exact BF16-to-F32 conversion, add a regression whose tensor payload is deliberately odd-aligned, and pass the focused and full sanitizer gates.
This repair belongs in PR #524 so the release-binary campaign has one fully green integration PR.