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xenia-rs/audit-runs/audit-069-wait-signal-producer/s3/handle-sequence-diff.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

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# AUDIT-069 Session 3 — handle-sequence diff (ours tid=5 vs canary tid=10)
Two engines run γ-signaler family on identical thread (entry=0x82450A28, ctx=0x828F3B68).
ours labels this thread tid=5; canary labels it tid=10 (cross-engine tid mismatch, AUDIT-068 reading-error #28).
## Fire-count summary
| caller LR | symbol | wrapper PC | ours fires | canary fires | ratio |
|---|---|---|---|---|---|
| 0x8245DA44 | γ-D-A (sub_8245D9D8) | 0x824AA2F0 (NtSetEvent) | 5 | 23 | 22% |
| 0x8245DB08 | γ-D-B (sub_8245DA78) | 0x824AA2F0 (NtSetEvent) | 1 | 8 | 12% |
| 0x8245DC5C | γ-DB40 (sub_8245DB40) | 0x824AAF50 (Ke wrapper) | 75 | 461 | 16% |
| **TOTAL tid=5/tid=10 signaler work** | | | **81** | **492** | **16%** |
**Headline divergence**: ours completes ~16% of canary's producer-loop iterations.
Not (only) "wrong handles" — ours produces FAR fewer signals.
## Per-LR position-aligned sequence (handle = r3)
Note: ours uses normal slot-id namespace (0x10xx). canary uses pseudo-handle namespace (F8000xxx).
Handles cannot be compared by raw ID. Compare by position-in-per-LR-sequence and by call-args (size r5).
### γ-DB40 dispatch (lr=0x8245DC5C) — Ke wrapper @ 0x824AAF50
Args: r3=handle, r4=buf_ptr, r5=size, r6=0
| pos | ours r3 | ours r5(size) | ours r4(buf) | canary r3 | canary r5(size) | canary r4(buf) |
|---:|---|---|---|---|---|---|
| 0 | 0x00001040 | 0x00000800 | 0x41a01cd0 | 0xf8000030 | 0x00000800 | 0xbdb18cd0 |
| 1 | 0x0000105c | 0x00000800 | 0x41a01cd0 | 0xf8000034 | 0x00000800 | 0xbdb19cd0 |
| 2 | 0x00001098 | 0x00019000 | 0x42c12090 | 0xf8000044 | 0x00000800 | 0xbdb19cd0 |
| 3 | 0x000010ac | 0x00000800 | 0x41a01cd0 | 0xf8000044 | 0x00019000 | 0xbed2a090 |
| 4 | 0x000010d0 | 0x0001c000 | 0x431520d0 | 0xf8000078 | 0x0001c000 | 0xbf26a0d0 |
| 5 | 0x000010e0 | 0x00020000 | 0x4c946800 | 0xf8000078 | 0x00000800 | 0xbdb19cd0 |
| 6 | 0x000010e0 | 0x00020000 | 0x4c966800 | 0xf8000078 | 0x00020000 | 0xb2cb0800 |
| 7 | 0x000010e0 | 0x00020000 | 0x4c986800 | 0xf8000078 | 0x00020000 | 0xb2cd0800 |
| 8 | 0x000010e0 | 0x00020000 | 0x4c9a6800 | 0xf8000078 | 0x00020000 | 0xb2cf0800 |
| 9 | 0x000010e0 | 0x00020000 | 0x4c9c6800 | 0xf8000078 | 0x00020000 | 0xb2d10800 |
| 10 | 0x000010e0 | 0x00020000 | 0x4c9e6800 | 0xf8000078 | 0x00020000 | 0xb2d30800 |
| 11 | 0x000010e0 | 0x00020000 | 0x4ca06800 | 0xf8000078 | 0x00020000 | 0xb2d50800 |
| 12 | 0x000010e0 | 0x00020000 | 0x4ca26800 | 0xf8000078 | 0x00020000 | 0xb2d70800 |
| 13 | 0x000010e0 | 0x00020000 | 0x4ca46800 | 0xf8000078 | 0x00020000 | 0xb2d90800 |
| 14 | 0x000010e0 | 0x00020000 | 0x4ca66800 | 0xf8000078 | 0x00020000 | 0xb2db0800 |
| 15 | 0x000010e0 | 0x00020000 | 0x4ca86800 | 0xf8000078 | 0x00020000 | 0xb2dd0800 |
| 16 | 0x000010e0 | 0x00020000 | 0x4caa6800 | 0xf8000078 | 0x00020000 | 0xb2df0800 |
| 17 | 0x000010e0 | 0x00020000 | 0x4cac6800 | 0xf8000078 | 0x00020000 | 0xb2e10800 |
| 18 | 0x000010e0 | 0x00020000 | 0x4cae6800 | 0xf8000078 | 0x00020000 | 0xb2e30800 |
| 19 | 0x000010e0 | 0x00020000 | 0x4cb06800 | 0xf8000078 | 0x00020000 | 0xb2e50800 |
... (ours total 75, canary total 461)
### γ-D-A dispatch (lr=0x8245DA44) — NtSetEvent wrapper @ 0x824AA2F0
Args: r3=handle, r4=2(SignalKind=Set), r5=handle (dup), r6=ctx
| pos | ours r3 | ours r4 | canary r3 | canary r4 |
|---:|---|---|---|---|
| 0 | 0x00001054 | 0x00000002 | 0xf8000044 | 0x00000002 |
| 1 | 0x00001064 | 0x00000002 | 0xf8000048 | 0x00000002 |
| 2 | 0x000010a0 | 0x00000002 | 0xf8000074 | 0x00000002 |
| 3 | 0x000010b4 | 0x00000002 | 0xf8000080 | 0x00000002 |
| 4 | 0x000010ec | 0x00000002 | 0xf8000098 | 0x00000002 |
| 5 | --- | --- | 0xf80000a8 | 0x00000002 |
| 6 | --- | --- | 0xf80000b8 | 0x00000002 |
| 7 | --- | --- | 0xf80000c4 | 0x00000002 |
| 8 | --- | --- | 0xf80000d4 | 0x00000002 |
| 9 | --- | --- | 0xf80000e0 | 0x00000002 |
| 10 | --- | --- | 0xf80000e8 | 0x00000002 |
| 11 | --- | --- | 0xf80000f0 | 0x00000002 |
| 12 | --- | --- | 0xf80000f8 | 0x00000002 |
| 13 | --- | --- | 0xf80000fc | 0x00000002 |
| 14 | --- | --- | 0xf80000c4 | 0x00000002 |
| 15 | --- | --- | 0xf800009c | 0x00000002 |
| 16 | --- | --- | 0xf80000d4 | 0x00000002 |
| 17 | --- | --- | 0xf80000d4 | 0x00000002 |
| 18 | --- | --- | 0xf80000d4 | 0x00000002 |
| 19 | --- | --- | 0xf80000d0 | 0x00000002 |
| 20 | --- | --- | 0xf80000d0 | 0x00000002 |
| 21 | --- | --- | 0xf80000d0 | 0x00000002 |
| 22 | --- | --- | 0xf8000124 | 0x00000002 |
... (ours total 5, canary total 23)
### γ-D-B dispatch (lr=0x8245DB08) — NtSetEvent wrapper @ 0x824AA2F0
| pos | ours r3 | ours r4 | canary r3 | canary r4 |
|---:|---|---|---|---|
| 0 | 0x000010d8 | 0x7116fc40 | 0xf8000044 | 0x7033fc10 |
| 1 | --- | --- | 0xf8000080 | 0x7033fc10 |
| 2 | --- | --- | 0xf80000c0 | 0x7033fc10 |
| 3 | --- | --- | 0xf80000d0 | 0x7033fc10 |
| 4 | --- | --- | 0xf80000b4 | 0x7033fc10 |
| 5 | --- | --- | 0xf80000d4 | 0x7033fc10 |
| 6 | --- | --- | 0xf80000d0 | 0x7033fc10 |
| 7 | --- | --- | 0xf80000c8 | 0x7033fc10 |
## First-mismatch identification
Per-LR position 0:
- γ-DB40 pos[0]: ours r3=0x1040 r5=0x800 r4=0x41a01cd0 | canary r3=0xF8000030 r5=0x800 r4=0xBDB18CD0
- **r5 (size) MATCHES** = 0x800.
- r4 (buf pointer) DIFFERS in absolute address (0x41a01cd0 vs 0xBDB18CD0) — different memory layouts, expected.
- r3 different namespace — to be expected (pseudo-handle vs slot id).
- γ-D-A pos[0]: ours r3=0x1054 r4=0x2 | canary r3=0xF8000044 r4=0x2
- r4 (signal-kind=Set) MATCHES.
- Args structurally match.
- γ-D-B pos[0]: ours r3=0x10D8 r4=0x7116FC40 r5=0x2 | canary r3=0xF8000044 r4=0x7033FC10 r5=0x2
- r5 (signal-kind) MATCHES.
- r4 (ctx pointer) DIFFERS in absolute address — different stack layout.
Position-0 invocations are STRUCTURALLY consistent. The divergence in per-fire COUNT (5 vs 23, 1 vs 8, 75 vs 461) means ours's producer LOOP runs ~5× fewer iterations before exiting.
## Wedge handle status in ours
**AUDIT-062 archive** (~9 days old) recorded ours wedge handles `0x12AC` and `0x12B8` (kind=Event/Auto)
with `<NO_SIGNALS_DESPITE_WAITS>` annotation.
In THIS run's ours lr-trace: handle 0x12AC count = **0**, handle 0x12B8 count = **0**.
Max handle seen in lr-trace: 0x121C (cache file handle).
The wedge handles `0x12AC`/`0x12B8` were NOT created in this 5B-instruction run — boot terminates early.
## Boot-termination evidence
- ours exec completed 1.5B instr / 47s wallclock, OR 5B instr / 159s wallclock — same handle universe.
- `--halt-on-deadlock` did NOT trigger.
- import_calls = 39,290 identical on both runs.
- tid=5 producer fires 81 events then goes quiet; consumer threads remain blocked on existing handles indefinitely.
- Wedge `0x12AC`/`0x12B8` from AUDIT-062 archive likely formed in deeper-boot trajectory (NtCreateEvent calls after a graphics-frame-tick or similar event that doesn't fire here).
## Classification: missing-signal vs race
**ours produces 81 signals where canary produces 492 from the SAME caller chain on the SAME guest thread.**
This is a **producer-loop-underrun** classification:
- The signaler thread (tid=5) runs the EXACT SAME guest-code path (PCs match, LRs match).
- Position-0 args match structurally.
- But the loop ITERATES far fewer times before going idle.
The "wrong handles" framing from AUDIT-062 is partial: the bigger problem is that **the loop exits early** — most of the work that canary completes never gets touched by ours.
Mechanism: sub_82450A68 dispatch loop reads work from a guest-memory work queue. Each iteration enqueues a new task once the previous fires. If the producer FEEDING that queue under-fires, the dispatch loop's read-head reaches the tail early and the loop exits (or blocks on a dispatcher event with no pending work).
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