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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

3.6 KiB

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Phase C+9 — XamContentCreateEnumerator re-validation

Gate matrix

#	gate	result
1	cvar-OFF determinism 50M (3 runs)	PASS — all 3 = `b8fa0e0460359a4f660adb7605e053de` (new baseline; coarse fields shifted: imports 40470→40465, ±5 reflecting downstream branch flip from the 0x525 return)
2	Phase B `image_loaded_sha256`	PASS — `ea8d160e9369328a5b922258a92113efb8d7ce3e1a5c12cc521e375985c91c18` (matches baseline; XEX loader untouched)
3	Phase A main chain matched-prefix > 102197	PASS — 102404 (+207 from 102197)
3b	tid=4 → 11 unchanged	PASS — 9 (no regression)
3c	tid=7 → 2 unchanged	PASS — 29 (no regression)
3d	tid=12 → 7 unchanged	PASS — 2 (no regression)
3e	tid=14 → 9 unchanged	PASS — 39 (no regression)
3f	tid=15 → 10 unchanged	PASS — 15 (no regression)
4	Build clean	PASS (1 unrelated `walk_committed_regions` dead-code warning, pre-existing)
5	Phase A emitter determinism (2 runs)	PASS — both det-fields md5 = `0b299c37b8fe9fd4ee1b1877a875543f`
6	Unit tests	PASS — 160 → 165 (+5 new, 0 regressions)

Stable-digest comparison

field	C+8 baseline	C+9 post-fix	delta
instructions	50000000	50000002	+2 (engine ticks; jittery)
imports	40470	40465	-5 (game took the 0x525 branch, calls fewer of something)
unimpl	0	0	0
draws	0	0	0
swaps	1	1	0
unique_render_targets	0	0	0
shader_blobs_live	0	0	0
texture_cache_entries	0	0	0

C+8 baseline c6d895829b4611964978990ae1cb8a6a → C+9 baseline b8fa0e0460359a4f660adb7605e053de. First non-trivial digest movement in 4 Phase C sub-sessions — the 0x525 return flips at least one downstream branch decision, producing 5 fewer import calls within 50M instructions.

Phase A determinism

ours.jsonl (run 1) det-fields md5: 0b299c37b8fe9fd4ee1b1877a875543f ours-determ.jsonl (run 2) : 0b299c37b8fe9fd4ee1b1877a875543f

Byte-identical on deterministic fields. New --phase-a det baseline (0b299c37…), replacing C+8's 9135e369…. Reflects the downstream trajectory shift caused by the return-value flip at idx=102197.

Per-chain summary

chain	C+8 KeResetEvent	C+9 XamContentCreateEnumerator	delta
canary tid=6 → ours tid=1 (main)	102197	102404	+207
canary tid=4 → ours tid=11	9	9	0 (sister at end of ours window)
canary tid=7 → ours tid=2	29	29	0 (sister at end of ours window)
canary tid=12 → ours tid=7	2	2	0 (different bug: KeWaitForSingleObject 258 vs 0)
canary tid=14 → ours tid=9	39	39	0 (different bug: XAudio vs RtlEnterCS)
canary tid=15 → ours tid=10	15	15	0

All gates pass. No regressions.

Next target

canary tid=6 → ours tid=1 main, idx 102404: NtQueryFullAttributesFile

canary return_value=0 (STATUS_SUCCESS) — file/path exists
ours return_value=3221225524 (0xC0000034 STATUS_OBJECT_NAME_NOT_FOUND) — file/path missing

Likely a VFS/cache path-existence divergence: canary has a pre-populated content directory or HDD-backing mount that responds SUCCESS to a specific Sylpheed query path, while ours's fresh-boot VFS rejects it. Sister of AUDIT-053/054 (VFS layout aliasing) and the AUDIT-052 cache persistence question.

The args/path string is not captured in the Phase A event payload (emitter gap — kernel.call args resolution for lpstring_t not wired). First step in Phase C+10 will be capturing the path (either via the existing emitter or a one-shot --trace-imports run with the same ISO + binary).

3.6 KiB Raw Blame History