# Phase A diff report

**This report is the output of Phase A's diff harness. Divergences
shown here are INPUT for Phase B (first-divergence localization),
not findings of Phase A.** Phase A's job is to make the harness
itself correct, not to analyze what it surfaces.

## Summary

| canary_tid | ours_tid | matched | canary_total | ours_total | first_divergence_at |
|---|---|---|---|---|---|
| 4 | 11 | 5 | 47573 | 9 | 5 |
| 6 | 1 | 102158 | 329948 | 108486 | 102158 |
| 7 | 2 | 26 | 29 | 30 | 26 |
| 12 | 7 | 2 | 6689 | 3 | 2 |
| 14 | 9 | 39 | 1371603 | 75 | 39 |
| 15 | 10 | 15 | 863209 | 15 | — |

## canary_tid=4 → ours_tid=11

First divergence at `tid_event_idx=5`: payload.return_value: canary=1 ours=0

**Pre-context (last 5 matching events):**
```
  canary: [0] import.call RtlEnterCriticalSection
  ours:   [0] import.call RtlEnterCriticalSection
  canary: [1] kernel.call RtlEnterCriticalSection
  ours:   [1] kernel.call RtlEnterCriticalSection
  canary: [2] kernel.return RtlEnterCriticalSection
  ours:   [2] kernel.return RtlEnterCriticalSection
  canary: [3] import.call KeSetEvent
  ours:   [3] import.call KeSetEvent
  canary: [4] kernel.call KeSetEvent
  ours:   [4] kernel.call KeSetEvent
```

**Divergent event:**
```
  canary: [5] kernel.return KeSetEvent
  ours:   [5] kernel.return KeSetEvent
```

**Next event after the divergence (if any):**
```
  canary: [6] import.call KeWaitForMultipleObjects
  ours:   [6] import.call KeWaitForMultipleObjects
```

**Raw events (JSON):**
```json
{"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}
{"deterministic": true, "engine": "ours", "guest_cycle": 33, "host_ns": 1684500068, "kind": "kernel.return", "payload": {"name": "KeSetEvent", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 11, "tid_event_idx": 5}
```

## canary_tid=6 → ours_tid=1

First divergence at `tid_event_idx=102158`: payload.return_value: canary=1 ours=0

**Pre-context (last 5 matching events):**
```
  canary: [102153] import.call XamTaskSchedule
  ours:   [102153] import.call XamTaskSchedule
  canary: [102154] kernel.call XamTaskSchedule
  ours:   [102154] kernel.call XamTaskSchedule
  canary: [102155] kernel.return XamTaskSchedule
  ours:   [102155] kernel.return XamTaskSchedule
  canary: [102156] import.call XamTaskCloseHandle
  ours:   [102156] import.call XamTaskCloseHandle
  canary: [102157] kernel.call XamTaskCloseHandle
  ours:   [102157] kernel.call XamTaskCloseHandle
```

**Divergent event:**
```
  canary: [102158] kernel.return XamTaskCloseHandle
  ours:   [102158] kernel.return XamTaskCloseHandle
```

**Next event after the divergence (if any):**
```
  canary: [102159] import.call KeWaitForSingleObject
  ours:   [102159] import.call KeWaitForSingleObject
```

**Raw events (JSON):**
```json
{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 727355400, "kind": "kernel.return", "payload": {"name": "XamTaskCloseHandle", "return_value": 1, "side_effects": [], "status": "0x00000001"}, "schema_version": 1, "tid": 6, "tid_event_idx": 102158}
{"deterministic": true, "engine": "ours", "guest_cycle": 5378571, "host_ns": 457674580, "kind": "kernel.return", "payload": {"name": "XamTaskCloseHandle", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 1, "tid_event_idx": 102158}
```

## canary_tid=7 → ours_tid=2

First divergence at `tid_event_idx=26`: payload.return_value: canary=1 ours=0

**Pre-context (last 5 matching events):**
```
  canary: [21] import.call ExRegisterTitleTerminateNotification
  ours:   [21] import.call ExRegisterTitleTerminateNotification
  canary: [22] kernel.call ExRegisterTitleTerminateNotification
  ours:   [22] kernel.call ExRegisterTitleTerminateNotification
  canary: [23] kernel.return ExRegisterTitleTerminateNotification
  ours:   [23] kernel.return ExRegisterTitleTerminateNotification
  canary: [24] import.call KeSetEvent
  ours:   [24] import.call KeSetEvent
  canary: [25] kernel.call KeSetEvent
  ours:   [25] kernel.call KeSetEvent
```

**Divergent event:**
```
  canary: [26] kernel.return KeSetEvent
  ours:   [26] kernel.return KeSetEvent
```

**Next event after the divergence (if any):**
```
  canary: [27] import.call KeWaitForSingleObject
  ours:   [27] import.call KeWaitForSingleObject
```

**Raw events (JSON):**
```json
{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 729504400, "kind": "kernel.return", "payload": {"name": "KeSetEvent", "return_value": 1, "side_effects": [], "status": "0x00000001"}, "schema_version": 1, "tid": 7, "tid_event_idx": 26}
{"deterministic": true, "engine": "ours", "guest_cycle": 4262, "host_ns": 457924264, "kind": "kernel.return", "payload": {"name": "KeSetEvent", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 2, "tid_event_idx": 26}
```

## canary_tid=12 → ours_tid=7

First divergence at `tid_event_idx=2`: payload.return_value: canary=258 ours=0

**Pre-context (last 5 matching events):**
```
  canary: [0] import.call KeWaitForSingleObject
  ours:   [0] import.call KeWaitForSingleObject
  canary: [1] kernel.call KeWaitForSingleObject
  ours:   [1] kernel.call KeWaitForSingleObject
```

**Divergent event:**
```
  canary: [2] kernel.return KeWaitForSingleObject
  ours:   [2] kernel.return KeWaitForSingleObject
```

**Next event after the divergence (if any):**
```
  canary: [3] import.call RtlEnterCriticalSection
  ours:   <end of stream>
```

**Raw events (JSON):**
```json
{"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}
{"deterministic": true, "engine": "ours", "guest_cycle": 30, "host_ns": 484369313, "kind": "kernel.return", "payload": {"name": "KeWaitForSingleObject", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 7, "tid_event_idx": 2}
```

## canary_tid=14 → ours_tid=9

First divergence at `tid_event_idx=39`: payload.ord: canary=503 ours=293

**Pre-context (last 5 matching events):**
```
  canary: [34] kernel.call KeReleaseSpinLockFromRaisedIrql
  ours:   [34] kernel.call KeReleaseSpinLockFromRaisedIrql
  canary: [35] kernel.return KeReleaseSpinLockFromRaisedIrql
  ours:   [35] kernel.return KeReleaseSpinLockFromRaisedIrql
  canary: [36] import.call KfLowerIrql
  ours:   [36] import.call KfLowerIrql
  canary: [37] kernel.call KfLowerIrql
  ours:   [37] kernel.call KfLowerIrql
  canary: [38] kernel.return KfLowerIrql
  ours:   [38] kernel.return KfLowerIrql
```

**Divergent event:**
```
  canary: [39] import.call XAudioGetVoiceCategoryVolumeChangeMask
  ours:   [39] import.call RtlEnterCriticalSection
```

**Next event after the divergence (if any):**
```
  canary: [40] kernel.call XAudioGetVoiceCategoryVolumeChangeMask
  ours:   [40] kernel.call RtlEnterCriticalSection
```

**Raw events (JSON):**
```json
{"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}
{"deterministic": true, "engine": "ours", "guest_cycle": 417, "host_ns": 1684690071, "kind": "import.call", "payload": {"module": "xboxkrnl.exe", "name": "RtlEnterCriticalSection", "ord": 293}, "schema_version": 1, "tid": 9, "tid_event_idx": 39}
```

## canary_tid=15 → ours_tid=10

No divergence within the 15 compared events (canary has 863209, ours has 15).