# 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 | 102044 | 329948 | 108492 | 102044 |
| 7 | 2 | 2 | 29 | 33 | 2 |
| 12 | 7 | 2 | 6689 | 3 | 2 |
| 14 | 9 | 11 | 1371603 | 75 | 11 |
| 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": 1739410338, "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=102044`: payload.return_value: canary=0 ours=1880093792

**Pre-context (last 5 matching events):**
```
  canary: [102039] import.call NtClose
  ours:   [102039] import.call NtClose
  canary: [102040] kernel.call NtClose
  ours:   [102040] kernel.call NtClose
  canary: [102041] kernel.return NtClose
  ours:   [102041] kernel.return NtClose
  canary: [102042] import.call RtlInitAnsiString
  ours:   [102042] import.call RtlInitAnsiString
  canary: [102043] kernel.call RtlInitAnsiString
  ours:   [102043] kernel.call RtlInitAnsiString
```

**Divergent event:**
```
  canary: [102044] kernel.return RtlInitAnsiString
  ours:   [102044] kernel.return RtlInitAnsiString
```

**Next event after the divergence (if any):**
```
  canary: [102045] import.call RtlInitAnsiString
  ours:   [102045] import.call RtlInitAnsiString
```

**Raw events (JSON):**
```json
{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 723767100, "kind": "kernel.return", "payload": {"name": "RtlInitAnsiString", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 6, "tid_event_idx": 102044}
{"deterministic": true, "engine": "ours", "guest_cycle": 5366835, "host_ns": 482786835, "kind": "kernel.return", "payload": {"name": "RtlInitAnsiString", "return_value": 1880093792, "side_effects": [], "status": "0x700ff460"}, "schema_version": 1, "tid": 1, "tid_event_idx": 102044}
```

## canary_tid=7 → ours_tid=2

First divergence at `tid_event_idx=2`: payload.return_value: canary=0 ours=1896873464

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

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

**Next event after the divergence (if any):**
```
  canary: [3] import.call NtCreateFile
  ours:   [3] import.call NtCreateFile
```

**Raw events (JSON):**
```json
{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 728945300, "kind": "kernel.return", "payload": {"name": "RtlInitAnsiString", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 7, "tid_event_idx": 2}
{"deterministic": true, "engine": "ours", "guest_cycle": 2475, "host_ns": 483549354, "kind": "kernel.return", "payload": {"name": "RtlInitAnsiString", "return_value": 1896873464, "side_effects": [], "status": "0x710ffdf8"}, "schema_version": 1, "tid": 2, "tid_event_idx": 2}
```

## 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": 517186933, "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=11`: payload.return_value: canary=2 ours=0

**Pre-context (last 5 matching events):**
```
  canary: [6] import.call KeAcquireSpinLockAtRaisedIrql
  ours:   [6] import.call KeAcquireSpinLockAtRaisedIrql
  canary: [7] kernel.call KeAcquireSpinLockAtRaisedIrql
  ours:   [7] kernel.call KeAcquireSpinLockAtRaisedIrql
  canary: [8] kernel.return KeAcquireSpinLockAtRaisedIrql
  ours:   [8] kernel.return KeAcquireSpinLockAtRaisedIrql
  canary: [9] import.call KeRaiseIrqlToDpcLevel
  ours:   [9] import.call KeRaiseIrqlToDpcLevel
  canary: [10] kernel.call KeRaiseIrqlToDpcLevel
  ours:   [10] kernel.call KeRaiseIrqlToDpcLevel
```

**Divergent event:**
```
  canary: [11] kernel.return KeRaiseIrqlToDpcLevel
  ours:   [11] kernel.return KeRaiseIrqlToDpcLevel
```

**Next event after the divergence (if any):**
```
  canary: [12] import.call KeRaiseIrqlToDpcLevel
  ours:   [12] import.call KeRaiseIrqlToDpcLevel
```

**Raw events (JSON):**
```json
{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 1081453000, "kind": "kernel.return", "payload": {"name": "KeRaiseIrqlToDpcLevel", "return_value": 2, "side_effects": [], "status": "0x00000002"}, "schema_version": 1, "tid": 14, "tid_event_idx": 11}
{"deterministic": true, "engine": "ours", "guest_cycle": 77, "host_ns": 1739453637, "kind": "kernel.return", "payload": {"name": "KeRaiseIrqlToDpcLevel", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 9, "tid_event_idx": 11}
```

## canary_tid=15 → ours_tid=10

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