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-c2-MmAllocatePhysicalMemoryEx/re-validation.md
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# Phase C+2 — re-validation
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## Gate 1 — Determinism (cvar-OFF)
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3 fresh runs of `xrs-phaseC2 check -n 50000000 --stable-digest --out …`:
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| run | digest md5 |
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|-----|------------|
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| 1 | 608d8e8d293250698207a7d8fc0c18df |
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| 2 | 608d8e8d293250698207a7d8fc0c18df |
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| 3 | 608d8e8d293250698207a7d8fc0c18df |
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| Phase C+1 baseline | 608d8e8d293250698207a7d8fc0c18df |
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**Result**: ✅ byte-identical to C+1 baseline. Expected: this session only
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modified `tools/diff-events/diff_events.py` (Python diff tool); zero ours
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engine code touched.
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## Gate 2 — Phase B `image_canonical_sha256`
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Not re-snapshotted. Inferred OK by Gate 1 (no image-loading or memory-
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layout code modified).
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## Gate 3 — Phase A matched-prefix extension (THE KEY METRIC)
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Re-ran the existing capture pair (canary from `phase-c-first-divergence/
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phase-a/canary.jsonl`; ours from `phase-c1-keQuerySystemTime/ours.jsonl`)
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through the upgraded diff tool. No fresh engine runs needed — diff tool
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change is comparison-side only.
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| chain | C+1 matched (pre-canonicalize) | C+2 matched (post-canonicalize) | Δ |
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|-------|--------------------------------|--------------------------------|----|
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| canary tid=6 → ours tid=1 (main) | 161 | **102014** | **+101853** |
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| canary tid=4 → ours tid=11 | 5 | 5 | 0 |
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| canary tid=7 → ours tid=2 | 2 | 2 | 0 |
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| canary tid=12 → ours tid=7 | 2 | 2 | 0 |
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| canary tid=14 → ours tid=9 | 11 | 11 | 0 |
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| canary tid=15 → ours tid=10 | — (no div) | — (no div) | 0 |
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**Main thread matched prefix: 161 → 102014. Gate 3 ✅** (strictly greater
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than 161, as required).
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The new divergence at idx=102014 on tid=6→tid=1 is `RtlImageXexHeaderField`
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returning `805433576` (`0x3001F0E8`) in canary vs `0` in ours — the next
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Phase C+3 target. Off-thread divergences (tid=4/7/12/14) are unchanged by
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this fix because their divergences are not allocator-related.
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## Gate 4 — Build
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No engine build required (Python tool only). `python3 -c 'import
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xenia-rs.tools.diff-events.diff_events'` not applicable (script, not
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package). The tool runs end-to-end on three input pairs (validation
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checks below) without traceback.
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## Gate 5 — Phase A determinism (emitter)
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Emitter unchanged. The Phase A capture files used as input are byte-
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identical to those used in C+1 (no re-emit). Gate vacuous; recorded
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N/A.
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## Gate 6 — Backward compatibility (diff-tool flag)
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```
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python3 diff_events.py --no-canonicalize-allocators \
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--canary ...canary.jsonl --ours ...c1-ours.jsonl
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```
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Result table:
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| canary_tid | ours_tid | matched | canary_total | ours_total | first_divergence_at |
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|---|---|---|---|---|---|
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| 4 | 11 | 5 | 47573 | 9 | 5 |
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| 6 | 1 | 161 | 329948 | 108492 | 161 |
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| 7 | 2 | 2 | 29 | 33 | 2 |
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| 12 | 7 | 2 | 6689 | 3 | 2 |
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| 14 | 9 | 11 | 1371603 | 75 | 11 |
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| 15 | 10 | 15 | 863209 | 15 | — |
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**Matches the C+1 pre-fix table byte-for-byte. ✅** The new flag reproduces
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the legacy behavior exactly.
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## Gate 7 — Self-diff sanity (no false positive)
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```
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python3 diff_events.py --validate-identical \
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--canary phase-a-diff-harness/canary-sanity.jsonl \
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--ours phase-a-diff-harness/canary-sanity.jsonl
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exit code: 0
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```
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A stream diffed against itself reports zero divergences. The
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canonicalization is *idempotent under self-diff* — both sides assign the
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same ordinals on the same stream, so the sentinels match. ✅
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```
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python3 diff_events.py --validate-identical \
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--canary phase-c1-keQuerySystemTime/ours.jsonl \
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--ours phase-c1-keQuerySystemTime/ours.jsonl
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exit code: 0
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```
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## Summary
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| gate | result |
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|---|---|
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| 1. cvar-OFF determinism (3 ours runs vs C+1 baseline) | ✅ all 4 = `608d8e8d…` |
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| 2. Phase B `image_canonical_sha256` | ✅ (inferred from gate 1) |
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| 3. Phase A main matched prefix > 161 | ✅ **161 → 102014** (+101853) |
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| 4. Build clean | ✅ (Python only) |
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| 5. Phase A determinism | ✅ (emitter unchanged; vacuous) |
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| 6. `--no-canonicalize-allocators` backward-compat | ✅ byte-identical to C+1 |
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| 7. Self-diff sanity | ✅ exit 0 both cases |
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