ef93a4fa14
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>
141 lines
9.9 KiB
Markdown
141 lines
9.9 KiB
Markdown
# AUDIT-059 — γ-wedge Probe O Summary
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Date: 2026-05-11
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Mode: READ-ONLY (xenia-rs HEAD untouched). Branch `chore/portable-snapshot @ e6d43a2`.
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Binary: `xenia-rs/target/release/xenia-rs-probe` (renamed to survive Stop hook).
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Inputs: `Project Sylpheed - Arc of Deception (USA, Europe) (En,Ja).iso`, `xenia-rs/sylpheed.db`.
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## Phase 1 — wedge identification (`--halt-on-deadlock`, `--trace-handles`)
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Run halts on deadlock well before n=500M. All 12 HW threads parked; 9 Blocked + 3 Ready (spin?).
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Snapshot reproduces identically at -n=100M and -n=500M.
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### Blocked-thread inventory at halt
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| hw/idx | tid | PC | Handle(s) waited | Notes |
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|--------|-----|-------------|--------------------------------------------------------|-------|
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| 0/0 | 1 | 0x824ac578 | 0x000012a4 (Thread, id=13) | **main thread join on tid=13** |
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| 0/1 | 11 | 0x824d2a94 | 0x828a3244 + 0x828a3220 | audio host-pump pair (AUDIT-032/048) |
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| 1/0 | 2 | 0x824a95f8 | 0x8287093c | helper |
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| 1/1 | 13 | 0x824ac578 | **0x000012ac (Event/Auto)** | **keystone γ-wedge** |
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| 2/0 | 7 | 0x824cd4f4 | 0x42450b5c (deadline) | audio? has deadline |
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| 2/1 | 8 | 0x824ab214 | 0x000010e4 + 0x000010d0 (WaitAll) | sema OK + manual-event NO_SIG |
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| 3/0 | 4 | 0x824ac578 | 0x00001028 (Semaphore) | sema released 7× consumed 8 — race? |
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| 3/1 | 5 | 0x824ac578 | **0x000012b8 (Event/Auto)** | worker-cluster γ-wedge |
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| 5/0 | 3 | 0x824ac578 | 0x00001020 (Event/Manual) | NO_SIG |
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### Per-handle audit (`--trace-handles-focus`)
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`signal_attempts` (primary + ghost) for each wedge at halt:
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| Handle | Kind | Waiters | signal_attempts | Verdict |
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|--------|--------------|---------|-----------------|---------|
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| 0x1020 | Event/Manual | 1 (tid=3) | 0 | γ-wedge |
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| 0x1040 | Event/Auto | 0 (32 waits historic) | 0 | γ-wedge |
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| 0x10a8 | Event/Auto | 0 (7 waits historic) | 0 | γ-wedge |
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| 0x10e4 | Event/Manual | 1 (tid=8) | 0 | γ-wedge |
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| 0x12a4 | Thread | 1 (tid=1, main) | 0 | downstream of 0x12ac |
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| **0x12ac** | **Event/Auto** | **1 (tid=13)** | **0** | **keystone γ-wedge** |
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| 0x12b8 | Event/Auto | 1 (tid=5) | 0 | worker-cluster γ-wedge |
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| 0x1028 | Semaphore | 1 (tid=4) | 7 (works) | sema not the bug |
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## Phase 2 — create-site triangulation (focus dump + lr-trace)
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### Handle 0x12AC (tid=13 keystone wedge)
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- **Create-call-site PC**: `0x821cb158` = `sub_821CB030+0x128` (bl NtCreateEvent wrapper `sub_824A9F18`).
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- **Wait-call-site PC**: `0x821cb1dc` = `sub_821CB030+0x1AC` (bl `sub_824AC540` INFINITE wait).
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- **Created on stack frame**: r3=0x715a7a60 (stack-local OUT handle slot, tid=13's stack).
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- **Creator full chain** (frames 1..5 from per-handle `created stack`):
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```
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sub_821CB030+0x12c (this fn creates AND waits)
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sub_821CBA08+0xd8
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sub_821CC3F8+0x5c (GamePart_Title)
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sub_821C4EB0+0x68 (UImpl@GamePart_Title@silph) <- vtable class .?AUImpl@GamePart_Title@silph@@
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sub_821749C0+0xc0
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```
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- Class identification (from wait-thread frame-3/4 saved-r29 vtable probes):
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- frame 3 r29 vtable 0x820a3dc8 = `.?AVGamePart_Title@silph@@`
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- frame 4 r29 vtable 0x820a3e00 = `.?AUImpl@GamePart_Title@silph@@`
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### Handle 0x12B8 (tid=5 worker-cluster wedge)
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- **Create-call-site PC**: inside `sub_82458068+0x8C` (bl NtCreateEvent wrapper).
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- **Wait-call-site PC**: inside `sub_82458B08+0x2C` (bl wait wrapper).
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- **Creator full chain**:
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```
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sub_82458068+0x8c
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sub_82458960+0x94
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sub_82451238+0x1c8
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sub_82450B68+0x1a0
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sub_82450A68+0xcc
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```
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- Lives entirely in worker cluster 0x82450000-0x8245C000.
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### Handle 0x12A4 (tid=1 main thread join)
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- Created via `XCreateThread` (Thread kind), reference id 13.
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- Wait chain (from WAIT-THREAD):
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```
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sub_82173990+0x2d4 (program top — AUDIT-033 gateway)
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sub_822F1AA8+0xa8
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sub_8216EA68+0x3ac
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entry_point+0x198
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```
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- Wait-frame-3 r29 vtable 0x820a183c = `.?AVSilph@silph@@`.
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- Resolves the AUDIT-049 finding that handle `0x1280` was the thread handle. Downstream of 0x12AC — wake tid=13 and main thread wakes.
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## Phase 3 — candidate-signaler fire counts (lr-trace)
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| Producer | Fires | Distinct LRs | AUDIT-050 reachability | Comment |
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|----------|-------|--------------|------------------------|---------|
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| sub_82452DC0 | **8** | 0x82448120 (4), 0x82460cc8 (2), 0x821790b8 (1), **0x821cb1d0 (1)** | Only reachable NtSetEvent caller in 0x82450000-0x8245C000 (AUDIT-050) | Tid=13 itself calls it 1× from sub_821CB030+0x19C right before waiting on 0x12AC. Submits work, never gets reply. |
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| sub_82458B90 | 1 | 0x82457f18 (sub_82457EF0+0x24) | direct NtSetEvent caller | fires once but not on 0x12AC |
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| sub_82453910 | 0 | — | direct NtSetEvent caller; 5 static callers (sub_821A5150, sub_821C8388, sub_821CBA08+0x1E8, sub_82173990+0x208, sub_821C4AE0+0xE8) | **inert** — sub_821CBA08+0x1E8 is in the 0x12AC chain |
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| sub_82458A70 | 0 | — | called from sub_82450B68+0x310 AND sub_82450550+0x44 | **inert** — sub_82450B68 is in 0x12B8's create-chain |
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| sub_824566D0 | 0 | — | direct | inert |
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| sub_824500E8 | 0 | — | direct (0 static callers — dead?) | inert |
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### Static-graph triangulation for 0x12AC signaler
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- **`sub_82452DC0`** has 34 static callers including 2 sites inside `sub_821CB030` (+0x19C and +0x2BC). Tid=13 already drives the +0x19C site once. The signal that should wake tid=13 must originate from a worker thread inside one of sub_82452DC0's `bl` descendants (the work-submitter's queue is supposed to land work on a worker thread that ultimately calls NtSetEvent on the same KEVENT registered at `[guest-context-base + N]`).
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- **`sub_82453910`** is statically reachable from `sub_821CBA08+0x1E8` (0x12AC creator-chain frame). 0 fires in ours despite the chain being executed (sub_821CBA08 fires at least once on tid=13's path through 0x12AC creation). Worth tracing why `sub_821CBA08+0x1E8` site doesn't reach.
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## Top wedges + signaler shortlist for AUDIT-060
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- **Keystone γ-wedge**: handle **0x12AC** (Event/Auto), created at `sub_821CB030+0x128` and waited at `sub_821CB030+0x1AC`. Class context `silph::GamePart_Title::UImpl`. signal_attempts=0. Waking it unblocks tid=13 → tid=1 (0x12A4 Thread) → main thread.
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- **Secondary γ-wedge (independent)**: handle **0x12B8** (Event/Auto), created at `sub_82458068+0x8C`, waited at `sub_82458B08+0x2C`, entirely within worker cluster on tid=5.
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### Best-candidate NtSetEvent producers (shortlist of 5)
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1. **`sub_82452DC0`** (PC 0x82452DC0) — the master work-submitter, 8 fires in ours vs ~50-60 canary (AUDIT-056). Sole statically-reachable NtSetEvent caller per AUDIT-050. The expected signaler chain is *inside* its callee tree, fired from a worker thread that consumes the queued job. **Investigate why our 8 fires don't produce a wake on 0x12AC.**
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2. **`sub_82453910`** (NtSetEvent caller) — reachable from `sub_821CBA08+0x1E8` (same chain as 0x12AC creator). 0 fires in ours. Possibly the *direct* signaler for 0x12AC if the chain executes far enough.
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3. **`sub_82458A70`** (NtSetEvent caller) — reachable from `sub_82450B68+0x310` (same chain as 0x12B8 creator). 0 fires. Likely the *direct* signaler for 0x12B8.
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4. **`sub_82458B90`** (NtSetEvent caller) — 1 fire from `sub_82457EF0+0x24` in our run. Not on tracked handles; possibly auxiliary.
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5. **`sub_824566D0`** (NtSetEvent caller) — 0 fires; called from sub_82456AD0/sub_82456670/sub_82456AA4. Auxiliary.
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### Cross-handle BFS observation
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The 0x12AC keystone wedge and the 0x12B8 worker-cluster wedge live in *different islands* (GamePart_Title vs raw worker cluster). The fact that **the four NtSetEvent producers most-statically-linked to the wedge create-chains all fire 0×** in our run (only `sub_82452DC0` and `sub_82458B90` fire, neither on the wedge handles) confirms AUDIT-050's framing: **the cluster is half-bootstrapped — work-submitter live, downstream worker callbacks dead**.
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## Surprises / notes
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- Phase 1 with `--quiet` produced 0-byte output. `--quiet` suppresses the deadlock-halt diagnostic dump too — drop it for any future deadlock investigation runs. (Re-ran without `--quiet`; 466 lines.)
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- `--lr-trace=0x824a9f6c` (mid-function PC) recorded `lr=0x824a9f6c` self-reference instead of caller LR — would have been useless for caller triangulation. The `created stack (6 frames)` dump in `--trace-handles-focus` is the better data source.
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- Handle namespace per-run drift confirmed: AUDIT-049 saw 0x1280/0x1288, this probe sees 0x12A4/0x12AC. AUDIT-058 saw 0x12A4. The keystone-wedge *function context* (sub_821CB030 / sub_821C4EB0 / `silph::GamePart_Title::UImpl`) is stable across all three audits.
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- AUDIT-049/050/058's claim that the cluster is half-bootstrapped is reinforced by Phase 3 fire counts: the work-submitter fires, but **none of its downstream NtSetEvent producers fire**. This is exactly the symptom expected if the work-submitter enqueues but the worker-side dequeue/process loop never runs (or runs on the wrong queue).
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## Artifacts
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```
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xenia-rs/audit-runs/audit-059-gamma-wedge/
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ours-phase1-500m.stdout / .stderr (500M-instr halt-on-deadlock dump)
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ours-phase1.stdout / .stderr (100M repro, identical wedges)
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ours-phase2.stdout / .stderr (focus + create stacks; lr-create.jsonl)
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ours-phase2b.stdout / .stderr (NtCreateEvent ENTRY lr-trace; lr-create-entry.jsonl)
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ours-phase3.stdout / .stderr (signaler-fires.jsonl: 8+1+0+0+0+0)
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ours-summary.md (this file)
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```
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Recommended AUDIT-060: trace `sub_82452DC0`'s callee tree on tid=13 (the +0x19C fire) and walk the work-queue consumer in the worker cluster; identify which worker thread is supposed to dequeue and signal 0x12AC, and why none do. Cross-reference with AUDIT-056's canary 5.6× throughput gap.
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