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tools(i422): parameterised debug-heap loop + plain rate loop; #422 re-characterised after it fired on the retail matrix row

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The fault is pack-independent (fired on the retail preset, 1080p, 45 s,
first launch after a build), ~1 in 57 offline runs today, never under a
debugger (46 runs), no WER/event trace on this machine. The pre-campaign
binary cannot be measured with this gate (no in-process close verb).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-08-23 05:19:18 +02:00
parent 621a0edfc6
commit fe56b6cf32
3 changed files with 58 additions and 5 deletions
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docs/ISSUES.md
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@ -46,9 +46,9 @@ owner accepted its look at the Stage-1 gate and re-keying changes it.
gate, and retire `ActiveDayGroupMultiplier`. Validator must reject unknown
kinds. Same class as the VM6 fix; do not guess the values.
## #422 — Intermittent heap-corruption exit (0xC0000374) after a pack-on offline capture
## #422 — Intermittent heap-corruption exit (0xC0000374) at process exit after an offline capture (pack on OR off)
**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.
**Status:** OPEN — filed 2026-08-22 at Campaign VM VM3; **characterised at VM7 (2026-08-23) — rare, pack-INDEPENDENT, exit-time, not yet caught with a stack.** Facts: (1) it fired once more, on the **retail (pack-off)** row of `tools/run-atmospheric-performance-matrix.ps1` at 1920×1080 / 45 s warm-up / uncapped on `621a0edf` — the first launch after a fresh build — so "retail/off never reproduced it" is withdrawn and the title's "pack-on" is wrong: the exit is in the common teardown. (2) It did not fire in 16 runs with cdb attached (High, 720p, 12 s), 24 runs launched under cdb's debug heap (High, 720p, 12 s), 6 runs under the debug heap with the exact matrix recipe, or 10 plain runs with the exact recipe and a forced non-incremental rebuild before run 1 (`tools/i422/loop-debugheap.ps1`, `tools/i422/loop-plain.ps1`) — 1 in ~57 offline runs today, ~2 %. (3) The fail-fast leaves NO Application event-log entry and NO WER report on this machine (WerSvc is in its normal on-demand state, nothing disabled), so there is no dump to read; a per-user `HKCU\SOFTWARE\Microsoft\Windows\Windows Error Reporting\LocalDumps\AcDream.App.exe` key (`DumpType=2`, `DumpFolder`) is the one-time user action that turns the next occurrence into a full dump — the project does not set registry keys itself. (4) The pre-campaign binary (`6c79d35c` + VM0 patches) CANNOT be tested with this tool: it predates the gate's in-process close verb, so every run ends in the gate's forced kill and never reaches the graceful-exit path where the fault lives (10/10 "automation close timed out") — whether the fault predates Campaign AR is therefore unknown, not disproven. Evidence: `docs/research/evidence/vm7/i422-*.txt`, `artifacts/vm7-matrix/uncapped-retail-1920x1080/` (the crashing run's log — managed shutdown complete, `MossTank disabled` last). Carried as a watch item for the owner's VM7 matrix; the owner decides whether a ~2 % exit-time fault blocks the merge.
**Component:** rendering / render packs (Campaign AR) — native teardown
**Description:** `tools/run-offline-pixel-gate.ps1 -RenderPackPreset high` (shipped