Files
xenia-rs/audit-runs/phase-c18-shared-global-race/diff-cold-vs-cold.md
MechaCat02 ef93a4fa14 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>
2026-06-05 07:19:08 +02:00

5.7 KiB

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 102553 250000 108490 102553 0/0
7 2 32 32 33 0/0
12 7 3 6954 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=102553: kind: canary='handle.create' ours='kernel.return'

Pre-context (last 5 matching events):

  canary: [102548] import.call RtlLeaveCriticalSection
  ours:   [102548] import.call RtlLeaveCriticalSection
  canary: [102549] kernel.call RtlLeaveCriticalSection
  ours:   [102549] kernel.call RtlLeaveCriticalSection
  canary: [102550] kernel.return RtlLeaveCriticalSection
  ours:   [102550] kernel.return RtlLeaveCriticalSection
  canary: [102551] import.call NtDuplicateObject
  ours:   [102551] import.call NtDuplicateObject
  canary: [102552] kernel.call NtDuplicateObject
  ours:   [102552] kernel.call NtDuplicateObject

Divergent event:

  canary: [102553] handle.create sid=df686b147b291902
  ours:   [102553] kernel.return NtDuplicateObject

Next event after the divergence (if any):

  canary: [102554] kernel.return NtDuplicateObject
  ours:   [102554] import.call RtlEnterCriticalSection

Raw events (JSON):

{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 1424314500, "kind": "handle.create", "payload": {"handle_semantic_id": "df686b147b291902", "object_name": null, "object_type": 1, "raw_handle_id": "0xf8000044"}, "schema_version": 1, "tid": 6, "tid_event_idx": 102553}
{"deterministic": true, "engine": "ours", "guest_cycle": 5398419, "host_ns": 461742475, "kind": "kernel.return", "payload": {"name": "NtDuplicateObject", "return_value": 0, "side_effects": [], "status": "0x00000000"}, "schema_version": 1, "tid": 1, "tid_event_idx": 102553}

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):

{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 1570223300, "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": 485908293, "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):

{"deterministic": true, "engine": "canary", "guest_cycle": 0, "host_ns": 1811324400, "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": 1606502025, "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).