fix: enumerate artifact downloads from checksums.txt so cute-dsl .so kernels are pre-fetched - #4548
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…kernels are pre-fetched download_artifacts() enumerated files by scraping the artifactory HTML index with a .cubin-only regex, so the DSL_FMHA (cute-dsl) kernels, which ship as .so files, were never downloaded even though their directories are explicitly listed in get_subdir_file_list(). Each directory's checksums.txt was downloaded regardless, so the cache looked complete while every kernel it lists was absent, and the missing kernels were then fetched over HTTP lazily inside the first model forward pass that needed them. Drive the enumeration from the per-directory checksums.txt manifests instead: they are authoritative for the directory contents, are already fetched by get_checksums(), and are themselves SHA-256 pinned via CheckSumHash.map_checksums. This also means every manifest entry is downloaded and checksum-verified by download_artifacts(), so a listed-but-missing file now fails loudly instead of silently, and the per-directory HTML index round-trips (and their retry stalls) are gone. Also widen the retained get_available_cubin_files() helper to match .so hrefs in addition to .cubin. Fixes flashinfer-ai#4432 Signed-off-by: Azra Bano <azrabano.work@gmail.com>
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughArtifact discovery now recognizes ChangesArtifact enumeration
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to Artifact downloads now enumerate checksum-manifest entries, including shared-object kernels, so required kernels are prefetched and verified without an identified merge-blocking risk. Sequence Diagram(s)sequenceDiagram
participant get_subdir_file_list
participant get_checksums
participant download_list
get_subdir_file_list->>get_checksums: Fetch and verify checksum manifest
get_checksums-->>get_subdir_file_list: Return safe manifest entries
get_subdir_file_list->>download_list: Add manifest-listed paths
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Inline comments:
In `@flashinfer/artifacts.py`:
- Around line 323-325: Update get_checksums() and download_artifacts() to verify
each manifest’s pinned SHA-256 before parsing or using its entries, and reject
absolute filenames or any .. path segments before safe_urljoin() or artifact
writes. Ensure invalid manifest paths are rejected while preserving downloads
only within FLASHINFER_CUBIN_DIR.
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flashinfer/artifacts.pytests/test_artifacts.py
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…lenames The checksums.txt manifests are now the enumeration source for downloads, so harden that trust boundary: refuse to parse a manifest that does not match its SHA-256 pin in CheckSumHash.map_checksums, and reject manifest entries that are absolute or contain '..' segments so an entry can never direct a write outside FLASHINFER_CUBIN_DIR.
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Inline comments:
In `@flashinfer/artifacts.py`:
- Around line 266-270: Update the filename validation in safe_urljoin() to
reject any value with a non-empty PureWindowsPath(filename).drive, alongside the
existing separator, absolute-path, and parent-component checks. Extend the
traversal regression test to cover C:/outside.so while preserving acceptance of
valid relative filenames.
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flashinfer/artifacts.pytests/test_artifacts.py
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Upstream flashinfer-ai#4648 folded the Rubin cubins into the same trtllm-gen and deepgemm packages, so ArtifactPath no longer has *_RUBIN members and the meta-info headers are FMHA, GEMM and BMM only. Conflicts resolved by taking upstream's cubin_dirs and header list, keeping the manifest-driven enumeration in get_subdir_file_list() and the manifest-pin / unsafe-name checks in get_checksums(), and dropping the Rubin cases from test_get_subdir_file_list() now that upstream covers the full-path keying in test_get_checksums_keys_by_full_path(). Signed-off-by: Azra Bano <azrabano.work@gmail.com> Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
`C:/outside.so` passed the existing absolute / `..` / backslash checks, and on Windows joining a drive-qualified name onto FLASHINFER_CUBIN_DIR replaces the cache root instead of nesting under it. Reject any entry with a non-empty PureWindowsPath(...).drive alongside the other checks, and add the case to the traversal regression test. Signed-off-by: Azra Bano <azrabano.work@gmail.com> Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Merged Also picked up the open drive-letter thread in 3206fd6:
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📌 Description
download_artifacts()never pre-fetches the DSL_FMHA (cute-dsl) kernels:get_available_cubin_filesscrapes the artifactory HTML index with a.cubin-only regex, and the cute-dsl kernels ship as TVM-FFI.sofiles. The directories are explicitly listed inget_subdir_file_list(), and each directory'schecksums.txtis downloaded, so on disk the cache looks complete while every kernel the manifest lists is absent — and the run finishes with a full progress bar, because the post-download checksum loop only iterates the files it enumerated. The missing kernels are then fetched lazily over HTTP inside the first forward pass that needs them, which under a serving workload blocks the scheduler mid-collective (see #4432 for a production trace: 960 files silently missing, watchdog abort, ~2 h reload).This PR makes each directory's
checksums.txtmanifest the source of truth for what to download:get_subdir_file_list()now yields every file the manifest lists (the manifest is generated by the publishing pipeline, already fetched byget_checksums(), and pinned by SHA-256 viaCheckSumHash.map_checksums), instead of re-scraping the HTML index with extension regexes. Every published artifact is therefore downloaded and checksum-verified, and a failed/unparseable index listing can no longer masquerade as an empty directory.get_available_cubin_files()'s regex is additionally widened to match.soalongside.cubin(and made a proper capture group), so the scraper is no longer silently wrong for callers/tests that use it directly.Chosen over just widening the regex everywhere because the manifest already exists, is already fetched, and is authoritative — scraping would stay one unanticipated extension away from the same silent failure.
🔍 Related Issues
Fixes #4432.
🚀 Pull Request Checklist
✅ Pre-commit Checks
pre-commitby runningpip install pre-commit(or used your preferred method).pre-commit install.pre-commit run --files flashinfer/artifacts.py tests/test_artifacts.py— trailing-whitespace, tabs, CRLF, mypy, ruff check, ruff format all pass).🧪 Tests
pytest tests/test_artifacts.py -q→ 10 passed (macOS arm64, CPU; the module is GPU-free and usesresponsesmocks). New tests:test_get_available_cubin_files_matches_so(a realistic cute-dsl directory index:.sokernels + a.cubinare enumerated,checksums.txt/LICENSEexcluded) andtest_get_subdir_file_list(manifest-driven enumeration yields the.sokernels with their checksums end-to-end); the pre-existing.cubin-only and non-200 tests still pass unchanged. Later commits addtest_get_checksums_rejects_tampered_manifest(a manifest not matching itsCheckSumHashpin is refused before parsing) andtest_get_checksums_rejects_traversal_filenames(../, absolute, backslash andC:/entries are refused as download paths). Rebased onto misc: multi-arch cubins (sm100, 103, 107) in a single artifact #4648's multi-arch packaging: no Rubin-specific paths remain in this diff.Reviewer Notes
checksums.txtever lists files that should not be pre-fetched, manifest-driven enumeration would start downloading them — from a look at current manifests that set is exactly the intended artifact set, but flagging it as the behavioral edge of this change.Summary by CodeRabbit
Bug Fixes
.cubinand.sokernel files.Tests