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docs: known issue for the flapping bad_nbit_parms_walk classification

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The committed CONFORMANCE.md counts bad_nbit_parms_walk.h5 as an
our-error because its six h5py reads agreed in that run; a rerun the
same day confirmed the over-read and counted it ref-bug. The ok count
(602 of 697) is the same either way.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
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osobh
2026-09-28 11:07:20 -05:00
co-authored by Claude Opus 5.5
parent ac0020594b
commit 24cc9d14d8
1 changed files with 21 additions and 0 deletions
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docs/known-issues.md
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@@ -23,6 +23,7 @@ Checked against `main` at `9b5803f` on 2026-09-28.
| [Range reads (`File::open_storage`) limits](#range-reads-fileopen_storage-limits) | cost; zero-copy APIs need an in-memory file | 2026-09-26 |
| [Remote files (`clawhdf5-remote`) limits](#remote-files-clawhdf5-remote-limits) | untested backends, fixed block size, timeouts | 2026-09-26 |
| [`clawhdf5-wasm` (browser) limits](#clawhdf5-wasm-browser-limits) | memory, round trips, unsupported types | 2026-09-26 |
| [Conformance: `bad_nbit_parms_walk.h5` flips between ref-bug and our-error](#conformance-bad_nbit_parms_walkh5-flips-between-ref-bug-and-our-error) | report noise (ok count unaffected) | 2026-09-28 |
| [The Node.js package does not work](#the-nodejs-package-packagesclawhdf5-node-does-not-work) | broken, unpublished, not in CI | 2026-09-25 |
---
@@ -378,6 +379,26 @@ browser (`clawhdf5-wasm`'s `openUrl`) open URLs since 2026-09-27.
- External links and virtual-dataset sources in other files cannot be
followed (no file system).
## Conformance: `bad_nbit_parms_walk.h5` flips between ref-bug and our-error
**Status:** open (found 2026-09-28). Report noise, not a clawhdf5 bug: the
ok count (602 of 697) and the gate are unaffected.
`hdf5/test/testfiles/bad_nbit_parms_walk.h5` `/Nbit_int_data_le` is an
object clawhdf5 refuses and HDF5 2.0 reads only by over-reading memory (see
[the last non-ok files](#conformance-the-last-non-ok-files)).
`conformance/ref_bugs.py` counts it as *ref-bug* only when h5py's values
differ across its six differently set-up reads. The committed
`CONFORMANCE.md` (run of 2026-09-28 04:29 UTC, `bf5a163`) saw one distinct
result in six reads, so it reports the file as **1 our-error** and 2
ref-bug; a rerun on tank the same day (16:06 UTC, `conformance/run.sh
--no-fetch`, docs-only changes on top of `9b5803f`) saw three distinct
results and reports 0 our-error, 3 ref-bug. Whether libhdf5's over-read
changes between processes depends on heap layout, so six reads do not
always expose it. A fix belongs in `conformance/ref_bugs.py` (more or more
varied reads for this object) or in documenting the file as a known
refusal; neither is done.
## The Node.js package (`packages/clawhdf5-node`) does not work
**Status:** open (found 2026-09-25; re-checked 2026-09-28, unchanged).