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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# Phase A diff report
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**This report is the output of Phase A's diff harness. Divergences
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shown here are INPUT for Phase B (first-divergence localization),
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not findings of Phase A.** Phase A's job is to make the harness
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itself correct, not to analyze what it surfaces.
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## Summary
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| canary_tid | ours_tid | matched | canary_total | ours_total | first_divergence_at | floating_skipped (c/o) |
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|---|---|---|---|---|---|---|
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| 4 | 11 | 11 | 20000 | 11 | — | 0/0 |
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| 6 | 1 | 102424 | 250000 | 108507 | 102424 | 0/0 |
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| 7 | 2 | 32 | 32 | 33 | — | 0/0 |
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| 12 | 7 | 3 | 20000 | 5 | 3 | 0/0 |
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| 14 | 9 | 41 | 20000 | 77 | 41 | 0/0 |
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| 15 | 10 | 16 | 20000 | 17 | — | 0/1 |
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*`floating_skipped (c/o)` counts shared-global `handle.create` events absorbed by Phase C+18 cross-tid SID matching (per-side, observation-side ordering of process-global dispatchers). See schema-v1.md §"Shared-global SIDs".*
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## canary_tid=4 → ours_tid=11
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No divergence within the 11 compared events (canary has 20000, ours has 11).
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## canary_tid=6 → ours_tid=1
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First divergence at `tid_event_idx=102424`: payload.return_value: canary=0 ours=18446744072635809807
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**Pre-context (last 5 matching events):**
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```
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canary: [102419] import.call RtlInitAnsiString
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ours: [102419] import.call RtlInitAnsiString
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canary: [102420] kernel.call RtlInitAnsiString
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ours: [102420] kernel.call RtlInitAnsiString
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canary: [102421] kernel.return RtlInitAnsiString
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ours: [102421] kernel.return RtlInitAnsiString
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canary: [102422] import.call NtQueryFullAttributesFile
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ours: [102422] import.call NtQueryFullAttributesFile
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canary: [102423] kernel.call NtQueryFullAttributesFile
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ours: [102423] kernel.call NtQueryFullAttributesFile
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```
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**Divergent event:**
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```
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canary: [102424] kernel.return NtQueryFullAttributesFile
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ours: [102424] kernel.return NtQueryFullAttributesFile
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```
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**Next event after the divergence (if any):**
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```
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canary: [102425] import.call RtlEnterCriticalSection
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ours: [102425] import.call RtlNtStatusToDosError
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```
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**Raw events (JSON):**
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```json
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{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 1463590800, "kind": "kernel.return", "payload": {"name": "NtQueryFullAttributesFile", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 6, "tid_event_idx": 102424}
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{"deterministic": true, "engine": "ours", "guest_cycle": 5391947, "host_ns": 477692480, "kind": "kernel.return", "payload": {"name": "NtQueryFullAttributesFile", "return_value": 18446744072635809807, "side_effects": [], "status": "0xc000000f"}, "schema_version": 1, "tid": 1, "tid_event_idx": 102424}
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```
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## canary_tid=7 → ours_tid=2
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No divergence within the 32 compared events (canary has 32, ours has 33).
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## canary_tid=12 → ours_tid=7
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First divergence at `tid_event_idx=3`: payload.timeout_ns: canary=-30000000 ours=429466729600
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**Pre-context (last 5 matching events):**
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```
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canary: [0] import.call KeWaitForSingleObject
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ours: [0] import.call KeWaitForSingleObject
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canary: [1] kernel.call KeWaitForSingleObject
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ours: [1] kernel.call KeWaitForSingleObject
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canary: [2] handle.create sid=c49d8f0ab90401ea
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ours: [2] handle.create sid=6e3d96c5a52bf429
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```
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**Divergent event:**
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```
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canary: [3] wait.begin {'handles_semantic_ids': ['c49d8f0ab90401ea'], 'timeout_ns': -30000000, 'alertable': False, 'wait_type': 'any'}
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ours: [3] wait.begin {'handles_semantic_ids': ['6e3d96c5a52bf429'], 'timeout_ns': 429466729600, 'alertable': False, 'wait_type': 'any'}
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```
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**Next event after the divergence (if any):**
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```
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canary: [4] kernel.return KeWaitForSingleObject
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ours: [4] kernel.return KeWaitForSingleObject
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```
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**Raw events (JSON):**
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```json
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{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 1582189500, "kind": "wait.begin", "payload": {"alertable": false, "handles_semantic_ids": ["c49d8f0ab90401ea"], "timeout_ns": -30000000, "wait_type": "any"}, "schema_version": 1, "tid": 12, "tid_event_idx": 3}
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{"deterministic": true, "engine": "ours", "guest_cycle": 0, "host_ns": 502700532, "kind": "wait.begin", "payload": {"alertable": false, "handles_semantic_ids": ["6e3d96c5a52bf429"], "timeout_ns": 429466729600, "wait_type": "any"}, "schema_version": 1, "tid": 7, "tid_event_idx": 3}
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```
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## canary_tid=14 → ours_tid=9
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First divergence at `tid_event_idx=41`: payload.ord: canary=503 ours=293
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**Pre-context (last 5 matching events):**
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```
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canary: [36] kernel.call KeReleaseSpinLockFromRaisedIrql
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ours: [36] kernel.call KeReleaseSpinLockFromRaisedIrql
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canary: [37] kernel.return KeReleaseSpinLockFromRaisedIrql
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ours: [37] kernel.return KeReleaseSpinLockFromRaisedIrql
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canary: [38] import.call KfLowerIrql
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ours: [38] import.call KfLowerIrql
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canary: [39] kernel.call KfLowerIrql
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ours: [39] kernel.call KfLowerIrql
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canary: [40] kernel.return KfLowerIrql
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ours: [40] kernel.return KfLowerIrql
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```
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**Divergent event:**
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```
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canary: [41] import.call XAudioGetVoiceCategoryVolumeChangeMask
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ours: [41] import.call RtlEnterCriticalSection
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```
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**Next event after the divergence (if any):**
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```
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canary: [42] kernel.call XAudioGetVoiceCategoryVolumeChangeMask
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ours: [42] kernel.call RtlEnterCriticalSection
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```
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**Raw events (JSON):**
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```json
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{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 1818928300, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "XAudioGetVoiceCategoryVolumeChangeMask", "ord": 503}, "schema_version": 1, "tid": 14, "tid_event_idx": 41}
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{"deterministic": true, "engine": "ours", "guest_cycle": 417, "host_ns": 1711325930, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "RtlEnterCriticalSection", "ord": 293}, "schema_version": 1, "tid": 9, "tid_event_idx": 41}
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```
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## canary_tid=15 → ours_tid=10
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No divergence within the 16 compared events (canary has 20000, ours has 17).
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