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>
53 lines
1.8 KiB
Markdown
53 lines
1.8 KiB
Markdown
# Phase C+20 cold-vs-cold result (2026-05-14)
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## No engine changes
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C+20 produces NO source modifications to either `xenia-rs` or
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`xenia-canary`. The session was a verify-only iteration concluding
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in an escalation decision (see `investigation.md`).
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## Matched-prefix table (vs C+19 baseline)
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| chain | C+19 | C+20 | delta |
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|--------------------------------|---------|---------|-------|
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| canary tid=6 → ours tid=1 main | 104,606 | 104,606 | 0 |
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| canary tid=4 → ours tid=11 | 11 | 11 | 0 |
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| canary tid=7 → ours tid=2 | 32 | 32 | 0 |
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| canary tid=12 → ours tid=7 | 3 | 3 | 0 |
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| canary tid=14 → ours tid=9 | 41 | 41 | 0 |
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| canary tid=15 → ours tid=10 | 16 | 16 | 0 |
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## Cold-stable digest
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`e1dfcb1559f987b35012a7f2dc6d93f5` — unchanged from C+13/C+15-α
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/C+16/C+17/C+18/C+19 (no source changes; digest cannot drift).
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## Phase B image hash
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`ea8d160e9369328a5b922258a92113efb8d7ce3e1a5c12cc521e375985c91c18` —
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unchanged (no source changes).
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## Tests
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Kernel: 204 PASS (unchanged from C+19, no test additions).
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## Canary non-determinism observation (NEW — RE class #32)
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Cross-validated across 3 fresh canary cold jsonls
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(`canary-jitter-{1,2,3}.jsonl` from C+19 jitter probe, all wiped-cache
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cold). At tid=6 idx 104,606:
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- jitter-1: `wait.begin sid=75ae880ec432eb36 timeout=-1`
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- jitter-2: `kernel.return RtlEnterCriticalSection rv=0` ← matches ours
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- jitter-3: `kernel.call RtlLeaveCriticalSection` (offset shift; the
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wait.begin moved to idx 104,603 with a different SID)
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The contention pattern in canary's `RtlEnterCriticalSection` is
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host-scheduler-dependent. The matched-prefix metric is unreliable in
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this region.
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## Outcome
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ESCALATE to scheduler-determinism track (separate session, larger
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scope).
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