# 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 | 9 | 47573 | 9 | — |
| 6 | 1 | 102164 | 329948 | 108486 | 102164 |
| 7 | 2 | 29 | 29 | 30 | — |
| 12 | 7 | 2 | 6689 | 3 | 2 |
| 14 | 9 | 39 | 1371603 | 75 | 39 |
| 15 | 10 | 15 | 863209 | 15 | — |

## canary_tid=4 → ours_tid=11

No divergence within the 9 compared events (canary has 47573, ours has 9).

## canary_tid=6 → ours_tid=1

First divergence at `tid_event_idx=102164`: payload.return_value: canary=1 ours=0

**Pre-context (last 5 matching events):**
```
  canary: [102159] import.call KeWaitForSingleObject
  ours:   [102159] import.call KeWaitForSingleObject
  canary: [102160] kernel.call KeWaitForSingleObject
  ours:   [102160] kernel.call KeWaitForSingleObject
  canary: [102161] kernel.return KeWaitForSingleObject
  ours:   [102161] kernel.return KeWaitForSingleObject
  canary: [102162] import.call KeResetEvent
  ours:   [102162] import.call KeResetEvent
  canary: [102163] kernel.call KeResetEvent
  ours:   [102163] kernel.call KeResetEvent
```

**Divergent event:**
```
  canary: [102164] kernel.return KeResetEvent
  ours:   [102164] kernel.return KeResetEvent
```

**Next event after the divergence (if any):**
```
  canary: [102165] import.call RtlLeaveCriticalSection
  ours:   [102165] import.call RtlLeaveCriticalSection
```

**Raw events (JSON):**
```json
{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 729617400, "kind": "kernel.return", "payload": {"name": "KeResetEvent", "return_value": 1, "side_effects": [], "status": "0x00000001"}, "schema_version": 1, "tid": 6, "tid_event_idx": 102164}
{"deterministic": true, "engine": "ours", "guest_cycle": 5378583, "host_ns": 466289581, "kind": "kernel.return", "payload": {"name": "KeResetEvent", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 1, "tid_event_idx": 102164}
```

## canary_tid=7 → ours_tid=2

No divergence within the 29 compared events (canary has 29, ours has 30).

## 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": 493023171, "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": 1687949303, "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).