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conformance: compare h5py's big-endian VL values corrected, confirm libhdf5 over-reads per run

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The last 3 our-errors and 2 mismatches were documented as not ours but
still counted against us, on a heuristic (any big-endian VL mismatch) and
a fixed list.

- ref.py checks that the installed h5py returns big-endian VL elements
  with the file's bytes under a little-endian dtype (writing and reading
  a vlen('>f4') in memory) and, if so, relabels them with the file's byte
  order before hashing, marking the object `ref_fix`. The values are now
  compared: attr_datatypes.hdf5 /@vlen_uint64 and tcomplex_be.h5
  /VariableLengthDatasetFloatComplex are identical to ours (h5dump 1.14.6
  prints the same (1, 2), (3, 4, 5), (42)).
- ref_bugs.py re-reads each object h5py reads only through a libhdf5 bug
  in six processes with different heaps (import order, MALLOC_PERTURB_).
  Values the file determines are the same every time; these three change
  (6, 6 and 3 distinct results), so they are over-read memory, not data
  clawhdf5 could match. compare.py classifies a file `ref-bug` only when
  every difference is such an object confirmed in the same run.
- report.py: the ref-bug class, the evidence table, the corrected
  objects; test_ref.py covers both (run in the nightly job).

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
This commit is contained in:
osobh
2026-09-27 22:26:32 -05:00
co-authored by Claude Opus 5.5
parent 425585ee71
commit 5c44630ea2
9 changed files with 379 additions and 65 deletions
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conformance/README.md
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@@ -19,9 +19,11 @@ probe's `szip` feature; `libaec-dev`), and a Python with the packages in
| `fetch-corpus.sh` | shallow, sparse, blob-filtered checkout of each pinned commit into `.cache/src/` (gitignored); no-op when already there |
| `list_files.py` | which files are probed (HDF5/netCDF-4 extensions minus netCDF classic, plus the CVE reproducers) |
| `probe/` | the clawhdf5 side: a standalone crate (outside the workspace, so `cargo test --workspace` never builds it) that walks a file with `clawhdf5-format` and prints canonical JSON |
| `ref.py` | the h5py side: the same JSON from h5py |
| `ref.py` | the h5py side: the same JSON from h5py (values corrected for a known h5py bug are marked `ref_fix`) |
| `ref_bugs.py` | re-reads the objects h5py reads only through a libhdf5 bug in six differently-set-up processes; an object whose values change is confirmed as a libhdf5 over-read |
| `test_ref.py` | tests of `ref.py`'s correction and `ref_bugs.py`'s confirmation (`python conformance/test_ref.py`) |
| `run_one.sh` | runs both sides on one file (and `h5dump` on the CVE corpus) under a timeout and an address-space limit |
| `compare.py` | classifies each file (ok / our-error / mismatch / h5py-cannot-read / panic / hang / crash / oom) and groups root causes |
| `compare.py` | classifies each file (ok / our-error / mismatch / h5py-cannot-read / ref-bug / panic / hang / crash / oom) and groups root causes |
| `report.py` | writes `CONFORMANCE.md` |
| `check.py` | the gate: fails on any panic/hang/crash/oom, on an ok count below `baseline.json`, or on a baseline-ok file that is no longer ok |
| `baseline.json` | the ok files the gate holds the line on |