# 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 | floating_skipped (c/o) |
|---|---|---|---|---|---|---|
| 4 | 11 | 11 | 20000 | 11 | — | 0/0 |
| 6 | 1 | 102424 | 250000 | 108507 | 102424 | 0/0 |
| 7 | 2 | 32 | 32 | 33 | — | 0/0 |
| 12 | 7 | 3 | 20000 | 5 | 3 | 0/0 |
| 14 | 9 | 41 | 20000 | 77 | 41 | 0/0 |
| 15 | 10 | 16 | 20000 | 17 | — | 0/1 |

*`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".*

## canary_tid=4 → ours_tid=11

No divergence within the 11 compared events (canary has 20000, ours has 11).

## canary_tid=6 → ours_tid=1

First divergence at `tid_event_idx=102424`: payload.return_value: canary=0 ours=18446744072635809807

**Pre-context (last 5 matching events):**
```
  canary: [102419] import.call RtlInitAnsiString
  ours:   [102419] import.call RtlInitAnsiString
  canary: [102420] kernel.call RtlInitAnsiString
  ours:   [102420] kernel.call RtlInitAnsiString
  canary: [102421] kernel.return RtlInitAnsiString
  ours:   [102421] kernel.return RtlInitAnsiString
  canary: [102422] import.call NtQueryFullAttributesFile
  ours:   [102422] import.call NtQueryFullAttributesFile
  canary: [102423] kernel.call NtQueryFullAttributesFile
  ours:   [102423] kernel.call NtQueryFullAttributesFile
```

**Divergent event:**
```
  canary: [102424] kernel.return NtQueryFullAttributesFile
  ours:   [102424] kernel.return NtQueryFullAttributesFile
```

**Next event after the divergence (if any):**
```
  canary: [102425] import.call RtlEnterCriticalSection
  ours:   [102425] import.call RtlNtStatusToDosError
```

**Raw events (JSON):**
```json
{"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}
{"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}
```

## canary_tid=7 → ours_tid=2

No divergence within the 32 compared events (canary has 32, ours has 33).

## canary_tid=12 → ours_tid=7

First divergence at `tid_event_idx=3`: payload.timeout_ns: canary=-30000000 ours=429466729600

**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
  canary: [2] handle.create sid=c49d8f0ab90401ea
  ours:   [2] handle.create sid=6e3d96c5a52bf429
```

**Divergent event:**
```
  canary: [3] wait.begin {'handles_semantic_ids': ['c49d8f0ab90401ea'], 'timeout_ns': -30000000, 'alertable': False, 'wait_type': 'any'}
  ours:   [3] wait.begin {'handles_semantic_ids': ['6e3d96c5a52bf429'], 'timeout_ns': 429466729600, 'alertable': False, 'wait_type': 'any'}
```

**Next event after the divergence (if any):**
```
  canary: [4] kernel.return KeWaitForSingleObject
  ours:   [4] kernel.return KeWaitForSingleObject
```

**Raw events (JSON):**
```json
{"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}
{"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}
```

## canary_tid=14 → ours_tid=9

First divergence at `tid_event_idx=41`: payload.ord: canary=503 ours=293

**Pre-context (last 5 matching events):**
```
  canary: [36] kernel.call KeReleaseSpinLockFromRaisedIrql
  ours:   [36] kernel.call KeReleaseSpinLockFromRaisedIrql
  canary: [37] kernel.return KeReleaseSpinLockFromRaisedIrql
  ours:   [37] kernel.return KeReleaseSpinLockFromRaisedIrql
  canary: [38] import.call KfLowerIrql
  ours:   [38] import.call KfLowerIrql
  canary: [39] kernel.call KfLowerIrql
  ours:   [39] kernel.call KfLowerIrql
  canary: [40] kernel.return KfLowerIrql
  ours:   [40] kernel.return KfLowerIrql
```

**Divergent event:**
```
  canary: [41] import.call XAudioGetVoiceCategoryVolumeChangeMask
  ours:   [41] import.call RtlEnterCriticalSection
```

**Next event after the divergence (if any):**
```
  canary: [42] kernel.call XAudioGetVoiceCategoryVolumeChangeMask
  ours:   [42] kernel.call RtlEnterCriticalSection
```

**Raw events (JSON):**
```json
{"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}
{"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}
```

## canary_tid=15 → ours_tid=10

No divergence within the 16 compared events (canary has 20000, ours has 17).