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-c6-call-name-divergence/re-validation.md
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audit-runs/phase-c6-call-name-divergence/re-validation.md
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# Phase C+6 — 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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| C+5 baseline (cvar-OFF) | `c6d895829b4611964978990ae1cb8a6a` |
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**Result**: ✅ byte-identical across 3 runs and SAME as the C+5
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baseline. The Phase C+6 fix is purely an emitter-framing change (cvar
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`phase_a_event_log` OFF path): the `unimplemented_exports` HashSet is
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consulted only inside the `phase_a_on` guard in `call_export`. The
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stub body (`stub_success`, which sets `r3 = 0`) still runs unchanged.
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Therefore the cvar-OFF deterministic boot trajectory is unchanged.
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Baseline digest preserved.
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## Gate 2 — Phase B `image_canonical_sha256`
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Phase B snapshot captured to `snap/ours/`.
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`image_loaded_sha256 = ea8d160e9369328a5b922258a92113efb8d7ce3e1a5c12cc521e375985c91c18`
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matches the Phase-A/B verify baseline. The fix touches only the
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kernel-export shim/emitter layer — no 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-c6-call-name-divergence/ours.jsonl` against
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the existing `phase-c-first-divergence/phase-a/canary.jsonl`.
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| chain | C+5 (pre-C+6) | C+6 (post) | Δ |
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|---|---|---|---|
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| canary tid=6 → ours tid=1 (main) | 102132 | **102158** | **+26** |
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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 102132 to 102158. Gate 3 ✅.**
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The new first-divergence at idx=102158 is `XamTaskCloseHandle`
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`return_value`: canary=1, ours=0 — value divergence, NOT a call-name
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divergence. 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 6.22s
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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` AND
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`guest_cycle` — both are timing-sensitive, see Stage 2's
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established practice):
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```
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ours.jsonl (run 1, det-fields-only) 7312446e49fa3c3149d26424832cabf4
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/tmp/c6_pa_run2.jsonl (run 2, det-fields-only) 7312446e49fa3c3149d26424832cabf4
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```
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Byte-identical. ✅
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Note: digest changes from C+5's `388d394a…` because the suppression
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flips 3 events on/off in the deterministic-fields stream. Expected.
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## Gate 6 — Kernel unit tests
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```
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$ cargo test --release -p xenia-kernel --lib
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test result: ok. 145 passed; 0 failed; 0 ignored; 0 measured;
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0 filtered out
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```
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1 new test added (144 → 145):
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* `register_unimplemented_export_marks_set_membership` — verifies the
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new `register_unimplemented_export` API both installs the export
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func (so `call_export` finds and runs the stub) AND inserts the
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`(module, ord)` pair into `unimplemented_exports` (so the Phase A
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emitter guard suppresses events). Cross-checks the negative case:
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a normal `register_export` does NOT mark unimplemented.
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Full workspace test suite (`cargo test --release --workspace`):
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no regressions.
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## Summary
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All 6 gates pass. Phase A main matched prefix grew from 102132 to
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102158 (+26 events). One class-E (Phase A coverage gap) engine bug
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fixed: ours's emitter injected 3 spurious events
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(`import.call`/`kernel.call`/`kernel.return`) for
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`IoDismountVolumeByFileHandle` because canary's syscall-thunk path
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for table-entry-only exports never reaches `Trampoline` and emits
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nothing. New `register_unimplemented_export` API in `state.rs` lets
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us mark such exports for Phase A suppression while keeping their
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stub body execution intact. Cvar-OFF inert.
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Diff-tool unchanged. Canary unchanged.
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Next divergence: **XamTaskCloseHandle return value at
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tid_event_idx=102158** (canary=1, ours=0 — value divergence). Phase
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C+7 target.
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