Fr0zka
bc0bf83c64
VF-01 CONFIRMED and it is the most serious find of the day. Initialize does StrateLayout.Empty() and Passages.Empty()/Add() -- freeing and reallocating both -- with no lock, barrier or drain anywhere in that file, while worker threads read the same arrays through AnyPassageNearBox (:460), EvaluateModifierSDF and FindSlotIndexForChunkZ, reached from GetDensityAt/ClassifyTile. RegenerateAllChunks bumps the epoch AFTER the mutation, so previous-epoch workers are live during it; the epoch rejects a finished result, it cannot make a read of a freed allocation safe. Same class already fixed once here: DiffLayer.ChunkMods got ModsLock after a carve-vs-stream AV. The dangerous call site is OnObjectModifiedInEditor, which fires automatically on a strate asset edit while streaming -- routine here. VF-10 confirmed real (74 fields, per near-surface sample) but Sol missed the conclusion: the copy is INHERITED from GetDensityWithParams, so both paths pay it and it does NOT explain the op-stack regression. The op stack improved it by memoising across eleven detail ops. Future optimisation, not the answer. Deliberately NOT fixing VF-01 now. Four code changes are stacked unbuilt and three have "nothing should move" as their acceptance signal; a fifth change to streaming lifecycle would make an odd build result unattributable. The three fix options (drain / snapshot / RWLock) trade a possible crash for an editor hitch or hot-path lock traffic -- a product decision, not an agent's. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>