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>
95 lines
3.6 KiB
Markdown
95 lines
3.6 KiB
Markdown
# Phase C+22 — Cold-vs-cold verification
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**Date:** 2026-05-26
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**Mode:** Diff-tool only (engine unchanged).
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## Methodology
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- ours-cold jsonl: `/tmp/ours-boot-cold.jsonl` (pre-existing, 28.7 MB,
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108,507 events on tid=1, 102,196 main-thread + worker noise). Captured
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fresh before this session per the boot-state remediation harness.
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Engine source unchanged — re-running ours-cold under this session's
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diff_events.py would produce a byte-identical jsonl.
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- canary jitter set: 3 archived cold runs `canary-jitter-{1,2,3}.jsonl`
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(4.4 / 3.5 / 3.7 GB) from
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`xenia-canary/build-cross/bin/Windows/Debug/`. These are the same
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reference jitter set used in C+20, C+21, Phase D Stage 0..4 — known
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to converge on the same logical boot up to the divergence-of-interest.
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- tid map: `--tid-map 6=1` (canary main thread → ours main thread,
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established in C+15-α auto_tid_map heuristic).
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## Pre-C+22 baseline (run before changes)
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```
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canary-jitter-1.jsonl → matched=105,128
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first divergence: payload.ctx_ptr
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canary='0xbe56bb3c' ours='0x42453b3c'
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at idx 105,128 (thread.create entry_pc=0x824cd458)
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```
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## Post-C+22 (3-jitter table)
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| jitter | matched | first divergence at | first-divergence kind / payload |
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|---|---|---|---|
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| 1 | **105,138** | 105,138 | `kernel.return VdQueryVideoFlags`: canary=3 ours=0 |
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| 2 | **105,138** | 105,138 | (same) |
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| 3 | **105,138** | 105,138 | (same) |
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Delta vs baseline: **+10 events** in main matched-prefix, on all three
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jitters. The new first divergence (`VdQueryVideoFlags`) is genuine and
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identical across all three jitters — confirming C+22 collapses the
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ctx_ptr noise without over-suppressing.
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## Absorber counters (sanity)
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| jitter | floating_create (c/o) | floating_wait (c/o) |
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|---|---|---|
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| 1 | 0 / 0 | 1 / 0 |
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| 2 | 0 / 0 | 0 / 0 |
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| 3 | 1 / 0 | 3 / 0 |
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Jitter-to-jitter variance in absorber counts is expected (scheduling-
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jitter window). Matched-prefix is stable at 105,138 across all three,
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confirming the canonicalization is robust to canary-side
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shared-global event reordering.
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## Sister chains
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No sister chains exercised in the 105,128–105,138 range. The 10
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absorbed events are all on the main `tid=6 → tid=1` chain:
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```
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[105135] handle.create (sid different — already skipped)
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[105135] thread.create (ctx_ptr CANONICALIZED v1.7)
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[105136] kernel.return ExCreateThread
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[105137] kernel.return KiApcNormalRoutineNop
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[105137] import.call VdQueryVideoMode
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[105138] kernel.call VdQueryVideoMode
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[105138] kernel.return VdQueryVideoMode
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[105139] import.call VdQueryVideoFlags
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[105140] kernel.call VdQueryVideoFlags
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[105141] kernel.return VdQueryVideoFlags ← NEW first divergence
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```
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(Per-jitter canary indices drift slightly; ours indices stable.)
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## Digest reproducibility
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ours engine source UNCHANGED — no rebuild needed. The pre-existing
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ours-cold jsonl (md5 `ecbd5046dbc73113144c8583592359e7`) is the input
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to the diff in all three jitter runs. Diff-tool output is purely
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derivative; running the diff multiple times against the same inputs
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produces byte-identical reports (modulo `host_ns` and dictionary
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ordering in pre-context lists — both already accounted for by the
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diff's stable sort).
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## Conclusion
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Phase C+22 advances main matched-prefix from 105,128 → 105,138 across
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all three canary jitter cold runs (+10 events, +0.0095 % of canary
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total). The next divergence is a real Vd-subsystem return-value
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mismatch unrelated to host-heap allocator drift.
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Engine UNCHANGED. Phase B `image_loaded_sha256` ε boundary UNCHANGED.
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Tripstones 1, 2, 3, 4, 5, 6 honored.
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