[CI] Fix cutlass import error: restore nvidia-cutlass-dsl force-reinstall#21182
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Kangyan-Zhou merged 1 commit intomainfrom Mar 23, 2026
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[CI] Fix cutlass import error: restore nvidia-cutlass-dsl force-reinstall#21182Kangyan-Zhou merged 1 commit intomainfrom
Kangyan-Zhou merged 1 commit intomainfrom
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…tall The CUDA dependency install refactor (#21017) accidentally removed the force-reinstall of nvidia-cutlass-dsl. Docker images ship nvidia-cutlass-dsl-libs-base 4.3.5; upgrading to 4.4.2 can delete the .pth file without reliably recreating it (pip race condition), causing stage-b/c jobs to fail with ModuleNotFoundError: No module named 'cutlass'.
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rainj-me
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Mar 23, 2026
0-693
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…tall (sgl-project#21182) Co-authored-by: Alison Shao <alison.shao@mac.lan>
JustinTong0323
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…tall (sgl-project#21182) Co-authored-by: Alison Shao <alison.shao@mac.lan>
yhyang201
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Apr 22, 2026
…tall (sgl-project#21182) Co-authored-by: Alison Shao <alison.shao@mac.lan>
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Summary
nvidia-cutlass-dslforce-reinstallModuleNotFoundError: No module named 'cutlass'across all runner types (5090, H100, B200)nvidia-cutlass-dsl-libs-base4.3.5, butpyproject.tomlrequires>=4.4.1. During the pip upgrade, the.pthfile (which makesimport cutlasswork) gets deleted but is not reliably recreated — a pip race condition. The force-reinstall ensures the.pthfile is always present.nvidia-cutlass-dsl-libs-base4.4.2 baked in, so the upgrade doesn't happen at CI runtimeFailing jobs: https://github.com/sgl-project/sglang/actions/runs/23418883303/job/68120071432, https://github.com/sgl-project/sglang/actions/runs/23421614705/job/68127702256
Test plan
python3 -c 'import cutlass; import cutlass.cute;'verification step