**Problem**: Larson benchmark crashes with TLS_SLL_DUP (double-free), 100% crash rate in debug
**Root Cause**: TLS drain pushback code (commit c2f104618) created duplicates by
pushing pointers back to TLS SLL while they were still in the linked list chain.
**Diagnostic Enhancements** (ChatGPT + Claude collaboration):
1. **Callsite Tracking**: Track file:line for each TLS SLL push (debug only)
- Arrays: g_tls_sll_push_file[], g_tls_sll_push_line[]
- Macro: tls_sll_push() auto-records __FILE__, __LINE__
2. **Enhanced Duplicate Detection**:
- Scan depth: 64 → 256 nodes (deep duplicate detection)
- Error message shows BOTH current and previous push locations
- Calls ptr_trace_dump_now() for detailed analysis
3. **Evidence Captured**:
- Both duplicate pushes from same line (221)
- Pointer at position 11 in TLS SLL (count=18, scanned=11)
- Confirms pointer allocated without being popped from TLS SLL
**Fix**:
- **core/box/tls_sll_drain_box.h**: Remove pushback code entirely
- Old: Push back to TLS SLL on validation failure → duplicates!
- New: Skip pointer (accept rare leak) to avoid duplicates
- Rationale: SuperSlab lookup failures are transient/rare
**Status**: Fix implemented, ready for testing
**Updated**:
- LARSON_DOUBLE_FREE_INVESTIGATION.md: Root cause confirmed
Docs Overview
このフォルダは hakmem の設計・計測・運用メモを体系化して管理する場所です。
- INDEX.md: 目次(各ドキュメントへのリンク)
- benchmarks/: ベンチマーク手順とスイープ結果の保存先
- specs/: 現在の仕様(SACS‑3/HW/ENV)を集約
- roadmap/: これからの実装計画・優先度・タスク
運用ルール(提案)
- 1つの変更/計測のまとまりにつき1ファイル(or 1フォルダ)
- 再現コマンド・環境変数・ハード構成は必ず記載
- 大きな連続出力はファイルへ保存し、本文からは抜粋/要約を記載