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-c5-NtWriteFile/re-validation.md
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# Phase C+5 — re-validation
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## Gate 1 — Determinism (cvar-OFF, ours)
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3 fresh runs of `check -n 50000000 --stable-digest`:
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| run | digest md5 |
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|-----|------------|
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| 1 | c6d895829b4611964978990ae1cb8a6a |
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| 2 | c6d895829b4611964978990ae1cb8a6a |
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| 3 | c6d895829b4611964978990ae1cb8a6a |
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| Stage-2 baseline (pre-C+5) | `d8a3d439c37d0436a12c3e01149d8fa8` |
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**Result**: ✅ byte-identical across 3 runs. New baseline `c6d89582…`
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diverges from the Stage-2 baseline `d8a3d439…` — expected per
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Tripstone #4 ("a real return-value fix in ours likely shifts the boot
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trajectory; the baseline digest WILL change"). The fix flips
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`NtOpenFile`'s reg read (r8 → r7) + adds an `async_file_handles` side
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table + adds a STATUS_PENDING branch to `nt_write_file`. The combined
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effect changes import counts from 40452 → 40470 (+18) because the
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game's downstream code reacts to the new async-style returns.
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## Gate 2 — Phase B `image_canonical_sha256`
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Phase B snapshot captured to `snap/ours/`. `image_loaded_sha256` =
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`ea8d160e9369328a5b922258a92113efb8d7ce3e1a5c12cc521e375985c91c18`,
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matches the Phase-A/B verify baseline. The fix touches only the
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kernel-export shim layer and the in-process file-handle table — no
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PE image bytes modified.
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## Gate 3 — Phase A matched-prefix extension (KEY METRIC)
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Diffed `audit-runs/phase-c5-NtWriteFile/ours.jsonl` against the
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existing `phase-c-first-divergence/phase-a/canary.jsonl`.
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| chain | C+3 (pre-C+5) | C+5 (post) | Δ |
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|---|---|---|---|
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| canary tid=6 → ours tid=1 (main) | 102068 | **102132** | **+64** |
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| canary tid=4 → ours tid=11 | 5 | 5 | 0 |
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| canary tid=7 → ours tid=2 | 15 | 15 | 0 |
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| canary tid=12 → ours tid=7 | 2 | 2 | 0 |
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| canary tid=14 → ours tid=9 | 39 | 39 | 0 |
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| canary tid=15 → ours tid=10 | (no div) | (no div) | 0 |
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**Main thread matched prefix grew from 102068 to 102132. Gate 3 ✅.**
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The new first-divergence at idx=102132 is `NtClose` (canary) vs
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`IoDismountVolumeByFileHandle` (ours) — a call-name divergence
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indicating a different branch, that's the next Phase C+N target.
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## Gate 4 — Build
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```
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$ cargo build --release
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Compiling xenia-kernel v0.1.0
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Compiling xenia-app v0.1.0
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Finished `release` profile [optimized] target(s) in 6.34s
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```
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One pre-existing dead-code warning (`walk_committed_regions`); not
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introduced by this fix. Canary untouched.
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## Gate 5 — Phase A determinism (emitter)
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Two cvar-ON captures of the same engine binary on the same ISO,
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md5-summing only deterministic fields (excluding `host_ns`):
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```
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ours.jsonl (run 1, deterministic-fields-only) 388d394a92f6b26a44d549fb70ca95fa
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/tmp/c5_pa_run2.jsonl (run 2, det-fields-only) 388d394a92f6b26a44d549fb70ca95fa
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```
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Byte-identical. ✅
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## Gate 6 — Kernel unit tests
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```
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$ cargo test --release -p xenia-kernel
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test result: ok. 144 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
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```
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3 new tests added (141 → 144):
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* `nt_write_file_async_handle_returns_status_pending` — file in
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`async_file_handles` returns STATUS_PENDING; IO_STATUS_BLOCK still
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records STATUS_SUCCESS.
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* `nt_write_file_sync_handle_returns_status_success` — file NOT in
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`async_file_handles` retains legacy STATUS_SUCCESS return.
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* `nt_close_prunes_async_file_set` — final handle close removes from
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the side-table.
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Pre-existing `cache_create_write_read_roundtrip` updated to set
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`FILE_SYNCHRONOUS_IO_NONALERT` on its create_options stack slot so the
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created handle is sync (legacy STATUS_SUCCESS assertion preserved).
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## Summary
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All 6 gates pass. Phase A main matched prefix grew from 102068 to
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102132 (+64 events). Two interlinked engine defects fixed: (1) wrong
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register read in `nt_open_file` (r8 → r7); (2) missing async/sync
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tracking on file handles. Diff-tool unchanged. Canary unchanged.
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Next divergence: **NtClose vs IoDismountVolumeByFileHandle at
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tid_event_idx=102132** (call-name divergence — game branches into a
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different code path). Class likely (A) missing handler or upstream
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state divergence — Phase C+6 target.
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