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/diff-report.md
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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 |
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|---|---|---|---|---|---|
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| 4 | 11 | 5 | 47573 | 9 | 5 |
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| 6 | 1 | 102132 | 329948 | 108489 | 102132 |
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| 7 | 2 | 15 | 29 | 33 | 15 |
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| 12 | 7 | 2 | 6689 | 3 | 2 |
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| 14 | 9 | 39 | 1371603 | 75 | 39 |
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| 15 | 10 | 15 | 863209 | 15 | — |
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## canary_tid=4 → ours_tid=11
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First divergence at `tid_event_idx=5`: payload.return_value: canary=1 ours=0
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**Pre-context (last 5 matching events):**
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```
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canary: [0] import.call RtlEnterCriticalSection
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ours: [0] import.call RtlEnterCriticalSection
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canary: [1] kernel.call RtlEnterCriticalSection
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ours: [1] kernel.call RtlEnterCriticalSection
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canary: [2] kernel.return RtlEnterCriticalSection
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ours: [2] kernel.return RtlEnterCriticalSection
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canary: [3] import.call KeSetEvent
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ours: [3] import.call KeSetEvent
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canary: [4] kernel.call KeSetEvent
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ours: [4] kernel.call KeSetEvent
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```
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**Divergent event:**
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```
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canary: [5] kernel.return KeSetEvent
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ours: [5] kernel.return KeSetEvent
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```
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**Next event after the divergence (if any):**
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```
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canary: [6] import.call KeWaitForMultipleObjects
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ours: [6] import.call KeWaitForMultipleObjects
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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": 1080594600, "kind": "kernel.return", "payload": {"name": "KeSetEvent", "return_value": 1, "side_effects": [], "status": "0x00000001"}, "schema_version": 1, "tid": 4, "tid_event_idx": 5}
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{"deterministic": true, "engine": "ours", "guest_cycle": 33, "host_ns": 1694772531, "kind": "kernel.return", "payload": {"name": "KeSetEvent", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 11, "tid_event_idx": 5}
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```
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## canary_tid=6 → ours_tid=1
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First divergence at `tid_event_idx=102132`: payload.ord: canary=207 ours=60
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**Pre-context (last 5 matching events):**
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```
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canary: [102127] kernel.call RtlEnterCriticalSection
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ours: [102127] kernel.call RtlEnterCriticalSection
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canary: [102128] kernel.return RtlEnterCriticalSection
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ours: [102128] kernel.return RtlEnterCriticalSection
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canary: [102129] import.call RtlLeaveCriticalSection
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ours: [102129] import.call RtlLeaveCriticalSection
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canary: [102130] kernel.call RtlLeaveCriticalSection
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ours: [102130] kernel.call RtlLeaveCriticalSection
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canary: [102131] kernel.return RtlLeaveCriticalSection
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ours: [102131] kernel.return RtlLeaveCriticalSection
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```
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**Divergent event:**
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```
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canary: [102132] import.call NtClose
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ours: [102132] import.call IoDismountVolumeByFileHandle
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```
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**Next event after the divergence (if any):**
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```
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canary: [102133] kernel.call NtClose
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ours: [102133] kernel.call IoDismountVolumeByFileHandle
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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": 726307000, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "NtClose", "ord": 207}, "schema_version": 1, "tid": 6, "tid_event_idx": 102132}
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{"deterministic": true, "engine": "ours", "guest_cycle": 5378182, "host_ns": 477341747, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "IoDismountVolumeByFileHandle", "ord": 60}, "schema_version": 1, "tid": 1, "tid_event_idx": 102132}
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```
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## canary_tid=7 → ours_tid=2
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First divergence at `tid_event_idx=15`: payload.ord: canary=300 ours=601
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**Pre-context (last 5 matching events):**
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```
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canary: [10] kernel.call NtQueryVolumeInformationFile
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ours: [10] kernel.call NtQueryVolumeInformationFile
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canary: [11] kernel.return NtQueryVolumeInformationFile
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ours: [11] kernel.return NtQueryVolumeInformationFile
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canary: [12] import.call RtlInitAnsiString
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ours: [12] import.call RtlInitAnsiString
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canary: [13] kernel.call RtlInitAnsiString
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ours: [13] kernel.call RtlInitAnsiString
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canary: [14] kernel.return RtlInitAnsiString
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ours: [14] kernel.return RtlInitAnsiString
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```
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**Divergent event:**
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```
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canary: [15] import.call RtlInitAnsiString
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ours: [15] import.call StfsCreateDevice
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```
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**Next event after the divergence (if any):**
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```
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canary: [16] kernel.call RtlInitAnsiString
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ours: [16] kernel.call StfsCreateDevice
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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": 729254300, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "RtlInitAnsiString", "ord": 300}, "schema_version": 1, "tid": 7, "tid_event_idx": 15}
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{"deterministic": true, "engine": "ours", "guest_cycle": 4231, "host_ns": 477679153, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "StfsCreateDevice", "ord": 601}, "schema_version": 1, "tid": 2, "tid_event_idx": 15}
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```
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## canary_tid=12 → ours_tid=7
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First divergence at `tid_event_idx=2`: payload.return_value: canary=258 ours=0
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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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```
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**Divergent event:**
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```
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canary: [2] kernel.return KeWaitForSingleObject
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ours: [2] kernel.return KeWaitForSingleObject
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```
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**Next event after the divergence (if any):**
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```
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canary: [3] import.call RtlEnterCriticalSection
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ours: <end of stream>
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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": 904485700, "kind": "kernel.return", "payload": {"name": "KeWaitForSingleObject", "return_value": 258, "side_effects": [], "status": "0x00000102"}, "schema_version": 1, "tid": 12, "tid_event_idx": 2}
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{"deterministic": true, "engine": "ours", "guest_cycle": 30, "host_ns": 504476955, "kind": "kernel.return", "payload": {"name": "KeWaitForSingleObject", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 7, "tid_event_idx": 2}
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```
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## canary_tid=14 → ours_tid=9
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First divergence at `tid_event_idx=39`: 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: [34] kernel.call KeReleaseSpinLockFromRaisedIrql
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ours: [34] kernel.call KeReleaseSpinLockFromRaisedIrql
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canary: [35] kernel.return KeReleaseSpinLockFromRaisedIrql
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ours: [35] kernel.return KeReleaseSpinLockFromRaisedIrql
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canary: [36] import.call KfLowerIrql
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ours: [36] import.call KfLowerIrql
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canary: [37] kernel.call KfLowerIrql
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ours: [37] kernel.call KfLowerIrql
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canary: [38] kernel.return KfLowerIrql
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ours: [38] kernel.return KfLowerIrql
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```
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**Divergent event:**
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```
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canary: [39] import.call XAudioGetVoiceCategoryVolumeChangeMask
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ours: [39] 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: [40] kernel.call XAudioGetVoiceCategoryVolumeChangeMask
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ours: [40] 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": 1082563200, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "XAudioGetVoiceCategoryVolumeChangeMask", "ord": 503}, "schema_version": 1, "tid": 14, "tid_event_idx": 39}
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{"deterministic": true, "engine": "ours", "guest_cycle": 417, "host_ns": 1694955205, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "RtlEnterCriticalSection", "ord": 293}, "schema_version": 1, "tid": 9, "tid_event_idx": 39}
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```
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## canary_tid=15 → ours_tid=10
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No divergence within the 15 compared events (canary has 863209, ours has 15).
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