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>
57 lines
2.1 KiB
Markdown
57 lines
2.1 KiB
Markdown
# Re-validation — Crowbar v3 composite progression metric
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**Date**: 2026-05-21
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**Method**: 3x OFF + 3x ON cold runs, 25M-instruction `check` digests.
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## Protocol
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- Binary: `target/release/xrs-crowbar3` (release build of HEAD + v3 patch).
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- Command: `xrs-crowbar3 check <ISO> -n 25000000 --gpu-thread --out <json>`.
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- OFF: no env vars set (crowbar default-off).
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- ON: `XENIA_CROWBAR_WORKERS=1 XENIA_CROWBAR_CTX_BIN=ctx-canary.bin`.
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- ISO: Sylpheed master image; no cache wipes between ours-runs (the
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crowbar trigger is per-instr-count, deterministic).
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## Results
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| Run | instructions | swaps | draws | unique_RT | score | notes |
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| OFF-1 | 25,000,000 | 1 | 0 | 0 | **1** | natural halt at limit |
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| OFF-2 | 25,000,000 | 1 | 0 | 0 | **1** | natural halt at limit |
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| OFF-3 | 25,000,000 | 1 | 0 | 0 | **1** | natural halt at limit |
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| ON-1 | 20,000,167 | 1 | 0 | 0 | **1** | FAULT @ pc=0 lr=0x82506e38 r3=0xBCE25640 tid=15 |
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| ON-2 | 20,000,167 | 1 | 0 | 0 | **1** | FAULT @ pc=0 lr=0x82506e38 r3=0xBCE25640 tid=15 |
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| ON-3 | 20,000,167 | 1 | 0 | 0 | **1** | FAULT @ pc=0 lr=0x82506e38 r3=0xBCE25640 tid=15 |
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## Composite score (option 6 from boot-state review)
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```
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score = 1*swaps + 10*draws + 100*unique_render_targets
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```
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- OFF mean: 1.0
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- ON mean: 1.0
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- **Δ = 0**
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## Determinism
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Across 3 ON runs:
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- Fault PC, LR, CTR, r3, r4, r29, r30, r31 are bit-identical.
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- Fault cycle is bit-identical (cycle=20000167).
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- `instructions=20000167` matches across all 3 runs (deterministic
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scheduling under the GPU thread backend).
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- `packets` varies slightly (18.6M / 18.7M / 19.1M) — expected, this
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is the GPU thread race documented as ±2-8% jitter.
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## Conclusion
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3x replication confirms the v3 crowbar deterministically faults at
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the same dispatch site with the same register state. The
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`XENIA_CROWBAR_CTX_BIN` install path is structurally sound — it writes
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exactly the canary-captured bytes (verified via the post-install u32
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slot dump in stderr) — but the secondary-object recursion is now the
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blocker.
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**The hypothesis "wedge is crowbar-soluble with full ctx state +
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worker spawn" is FALSIFIED at the case-(D) recursion level.**
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