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tools(gate): -ExeOverride and -DebuggerScript for the offline pixel gate; #422 characterised over 40 instrumented runs (Campaign VM VM7)

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-ExeOverride runs another AcDream.App.exe through the SAME isolated
settings/scene/capture path so two binaries compare without mixing tool
versions (VM0's recorded fieldOfView trap). -DebuggerScript launches the
client under cdb so ntdll's debug heap validates every free and a heap
corruption breaks at the corrupting site with a stack.

#422 (1-in-8 STATUS_HEAP_CORRUPTION exit after a pack-on offline capture):
16 runs attached + 24 runs under the debug heap on 1f151242, all clean
(P ~ 0.5 % at the filed rate). Recorded as not reproducible on the current
binary, carried as a watch item for the owner's VM7 matrix with the loop as
the first step if it recurs; no longer a merge blocker. Evidence under
docs/research/evidence/vm7 alongside the final pack-off-vs-base+normals
robust diff (5-10 px, lifestone band only).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-08-23 04:32:27 +02:00
parent 6ac3cc1070
commit c69029bf58
7 changed files with 131 additions and 4 deletions
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docs/ISSUES.md
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@ -48,7 +48,7 @@ kinds. Same class as the VM6 fix; do not guess the values.
## #422 — Intermittent heap-corruption exit (0xC0000374) after a pack-on offline capture
**Status:** OPEN — filed 2026-08-22 at Campaign VM VM3; VM7 gate item (fix or characterise before merge).
**Status:** OPEN — filed 2026-08-22 at Campaign VM VM3; **characterised at VM7 (2026-08-23): NOT REPRODUCIBLE on `1f151242` in 40 instrumented runs.** 16 runs with cdb attached during warm-up (`sxe` on bpe/av/0xC0000374/0xC0000409) and 24 runs launched under cdb with ntdll's debug heap (`tools/i422/loop-debugheap.ps1` → `tools/run-offline-pixel-gate.ps1 -DebuggerScript tools/cdb/i422-heap-launch.cdb`): every run captured, tore down and exited 0; no heap message, no break. At the filed 1-in-8 rate, 40 clean runs has P ≈ 0.5 %, so either the rate fell with the VM6 receiver-binding changes (`eec95535`–`1f151242` — the world pass now always binds the shadow/atmospheric blocks; a plausible teardown-order interaction, not proven) or the trigger is environmental. Evidence: `docs/research/evidence/vm7/i422-attached-16-runs.txt`, `i422-debugheap-24-runs.txt`. Carried as a watch item for the owner's VM7 visual matrix (an exit code `-1073740940` after any pack-on run re-opens it with the debug-heap loop as the first step); no longer blocks the merge.
**Component:** rendering / render packs (Campaign AR) — native teardown
**Description:** `tools/run-offline-pixel-gate.ps1 -RenderPackPreset high` (shipped