handoff: VSync/event-wedge fixes + iterate 2.A–2.BC research notes
Source changes (dormant parity infra, retained from iterate 2.AI/2.AO): - xenia-kernel/exports.rs: nt_create_event manual_reset polarity + related event wiring - xenia-gpu/mmio_region.rs: D1MODE_VBLANK_VLINE_STATUS hardcode parity Also lands the audit-runs/ analysis notes (.md/.txt/.json digests) for the iterate 2.x VSync/0x10e8/0x1004 wedge investigation. Raw trace dumps (.jsonl/.gz/.csv/.stdout) and agent worktrees (.claude/) are gitignored as regenerable local artifacts — see memory + HANDOFF for the running findings. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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MechaCat02
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audit-runs/phase-c11-1-access-recent-fix/re-validation.md
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audit-runs/phase-c11-1-access-recent-fix/re-validation.md
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# Phase C+11.1 — re-validation (HARD GATE)
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All gates listed in the original plan executed and passed.
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## Gate 1 — Determinism (3× cold reproducible)
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3 sequential `xrs-c11p1 check -n 50000000 --stable-digest` runs
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with `find ~/.local/share/xenia-rs/cache -mindepth 1 -delete`
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before each:
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| run | digest md5 |
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|---|---|
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| 1 | `ad4f74ee324fdedb0bfdd4cc4c6468e9` |
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| 2 | `ad4f74ee324fdedb0bfdd4cc4c6468e9` |
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| 3 | `ad4f74ee324fdedb0bfdd4cc4c6468e9` |
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PASS. New cold baseline. Differs from C+11's `b8fa0e0460359a4f660adb7605e053de`
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because the disp=1 + opts=0x7 cold probes now miss cleanly instead
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of producing spurious mkdir+SUCCESS — a behavior change is expected
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when correcting a behavior bug.
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Digest JSON:
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```
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{
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"instructions": 50000002,
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"imports": 40447,
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"unimpl": 0,
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"draws": 0,
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"swaps": 1,
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"unique_render_targets": 0,
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"shader_blobs_live": 0,
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"texture_cache_entries": 0
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}
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```
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## Gate 2 — Warm digest still deterministic
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`xrs-c11p1 check -n 50000000 --stable-digest` with the post-cold-run
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cache state already in place: `ad4f74ee324fdedb0bfdd4cc4c6468e9` —
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identical to cold. The C+11 era's cold-vs-warm gap (`b8fa0e04…` vs
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`cee0849a…`) has collapsed: with disp=1 returning NOT_FOUND
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cleanly, the first cache probe always misses and the rest of the
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boot path follows the same trajectory whether the cache is empty
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or warm.
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## Gate 3 — XENIA_CACHE_WIPE=1 opt-out still works
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`XENIA_CACHE_WIPE=1 xrs-c11p1 check -n 50000000 --stable-digest`:
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`ad4f74ee324fdedb0bfdd4cc4c6468e9` — identical. The AUDIT-038 wipe
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mode is preserved; under the new fix it produces the same digest
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as the default-persistent mode (because the boot path is identical
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when the cache is empty in either case).
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## Gate 4 — Phase B `image_loaded_sha256` unchanged
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`xrs-c11p1 exec --phase-b-snapshot-dir <dir> --phase-b-snapshot-and-exit`:
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```
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phase-b-snap/ours/config.json:
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"image_loaded_sha256": "ea8d160e9369328a5b922258a92113efb8d7ce3e1a5c12cc521e375985c91c18"
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```
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PASS — matches the prior Phase B baseline (`ea8d160e…`). The fix
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does not perturb the XEX image or its load layout.
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## Gate 5 — Cargo tests
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`cargo test -p xenia-kernel --release`: **172 passed; 0 failed**.
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Baseline pre-C+11.1 was 170 tests. Net +2 tests:
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* `cache_open_directory_on_missing_path_returns_not_found` — pins
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the cold-boot disp=1 + opts=0x7 behavior across `access`, `ignore`,
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`recent`. Asserts NOT_FOUND status, handle=0, and no host
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side-effect.
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* `cache_disp5_after_disp1_miss_creates_file` — pins the
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two-call sequence canary actually executes (disp=1 NOT_FOUND →
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disp=5 FILE created).
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## Gate 6 — Phase A cold-vs-cold matched-prefix table
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See [cold-vs-cold-baseline.md](cold-vs-cold-baseline.md). Headline
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main matched-prefix = **102404** (cold-vs-cold canonical; replaces
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the deprecated `+1521 to 103925` warm-asymmetric value).
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No regression on any of the 6 sister chains:
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| canary_tid | ours_tid | matched | first_divergence | regressed? |
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|---|---|---|---|---|
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| 6 | 1 | 102404 | 102404 | no (= prior cold value) |
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| 4 | 11 | 9 | — | no |
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| 7 | 2 | 29 | — | no |
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| 12 | 7 | 2 | 2 | no (pre-existing, unrelated) |
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| 14 | 9 | 39 | 39 | no (pre-existing, unrelated) |
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| 15 | 10 | 15 | — | no |
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## Gate 7 — Cache layout matches canary structurally
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Direct `stat` comparison:
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```
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~/.local/share/xenia-rs/cache/ ~/.local/share/Xenia/cache/
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69d8e45c/ (dir) 69d8e45c/ (dir)
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aab216c3/ (dir) aab216c3/ (dir)
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d4ea4615/ (dir) d4ea4615/ (dir)
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87719002/ (dir, canary-only — not
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reached in 50M ours boot)
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access (file, 72 B) access (file, 240 B)
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recent (file, 48 B) recent (file, 48 B → 160 B over
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many warm boots)
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```
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The `access`/`recent` dir-vs-file bug is **resolved**. ours's file
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sizes are smaller because they reflect one boot's worth of manifest
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records; canary's larger sizes reflect many warm boots. Structural
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layout (file vs directory, no spurious `ignore/`) matches.
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## Gate 8 — Build clean
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`cargo build --release` from `xenia-rs/` succeeds with no errors.
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One unrelated `dead_code` warning on `walk_committed_regions` in
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`phase_b_snapshot.rs` is pre-existing and unaffected.
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## Snapshots
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* `canary-cache-pre-wipe.tar.gz` — canary's 23-file oracle, preserved
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for any future warm-cache experiments.
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* `canary-cache-post-cold.tar.gz` — identical to pre-wipe (canary
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did not populate its cache in the 120 s cold-run window).
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* `ours-cache-post-cold.tar.gz` — ours's post-cold cache state
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showing the file-not-dir layout the fix produces.
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## Summary
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ALL 8 gates PASS. The fix is landable.
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