CRITICAL FIX: TLS 未初期化による 4T SEGV を完全解消

**問題:**
- Larson 4T で 100% SEGV (1T は 2.09M ops/s で完走)
- System/mimalloc は 4T で 33.52M ops/s 正常動作
- SS OFF + Remote OFF でも 4T で SEGV

**根本原因: (Task agent ultrathink 調査結果)**
```
CRASH: mov (%r15),%r13
R15 = 0x6261  ← ASCII "ba" (ゴミ値、未初期化TLS)
```

Worker スレッドの TLS 変数が未初期化:
- `__thread void* g_tls_sll_head[TINY_NUM_CLASSES];`  ← 初期化なし
- pthread_create() で生成されたスレッドでゼロ初期化されない
- NULL チェックが通過 (0x6261 != NULL) → dereference → SEGV

**修正内容:**
全 TLS 配列に明示的初期化子 `= {0}` を追加:

1. **core/hakmem_tiny.c:**
   - `g_tls_sll_head[TINY_NUM_CLASSES] = {0}`
   - `g_tls_sll_count[TINY_NUM_CLASSES] = {0}`
   - `g_tls_live_ss[TINY_NUM_CLASSES] = {0}`
   - `g_tls_bcur[TINY_NUM_CLASSES] = {0}`
   - `g_tls_bend[TINY_NUM_CLASSES] = {0}`

2. **core/tiny_fastcache.c:**
   - `g_tiny_fast_cache[TINY_FAST_CLASS_COUNT] = {0}`
   - `g_tiny_fast_count[TINY_FAST_CLASS_COUNT] = {0}`
   - `g_tiny_fast_free_head[TINY_FAST_CLASS_COUNT] = {0}`
   - `g_tiny_fast_free_count[TINY_FAST_CLASS_COUNT] = {0}`

3. **core/hakmem_tiny_magazine.c:**
   - `g_tls_mags[TINY_NUM_CLASSES] = {0}`

4. **core/tiny_sticky.c:**
   - `g_tls_sticky_ss[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
   - `g_tls_sticky_idx[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
   - `g_tls_sticky_pos[TINY_NUM_CLASSES] = {0}`

**効果:**
```
Before: 1T: 2.09M ✅  |  4T: SEGV 💀
After:  1T: 2.41M ✅  |  4T: 4.19M ✅  (+15% 1T, SEGV解消)
```

**テスト:**
```bash
# 1 thread: 完走
./larson_hakmem 2 8 128 1024 1 12345 1
→ Throughput = 2,407,597 ops/s ✅

# 4 threads: 完走（以前は SEGV）
./larson_hakmem 2 8 128 1024 1 12345 4
→ Throughput = 4,192,155 ops/s ✅
```

**調査協力:** Task agent (ultrathink mode) による完璧な根本原因特定

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/run_larson_perf.sh

@@ -1,6 +1,14 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# Defensive: ensure timeout exists; if not, best-effort shim
+if ! command -v timeout >/dev/null 2>&1; then
+  echo "[warn] 'timeout' not found; runs may hang on bench bugs" >&2
+  TIMEOUT() { "$@"; }
+else
+  TIMEOUT() { timeout --kill-after=2s "$@"; }
+fi
+
 # Perf-annotated Larson runs for system/mimalloc/HAKMEM without LD_PRELOAD.
 # Writes results under scripts/bench_results/larson_perf_*.txt
 
@@ -35,17 +43,43 @@ run_one() {
   local bin=$1; shift
   local thr=$1; shift
   local tag="${name}_${thr}T_${dur}s_${min}-${max}"
-  local outfile="$OUT_DIR/larson_perf_${tag}.txt"
-  echo "== $name threads=$thr ==" | tee "$outfile"
-  # Warm-up quick run (avoid one-time inits skew)
-  "$bin" 1 "$min" "$max" "$chunks" "$rounds" "$seed" "$thr" >/dev/null 2>&1 || true
-  # Throughput (quiet)
-  local tput
-  tput=$("$bin" "$dur" "$min" "$max" "$chunks" "$rounds" "$seed" "$thr" 2>/dev/null | rg "Throughput" -n || true)
-  echo "$tput" | tee -a "$outfile"
-  # perf stat
-  perf stat -o "$outfile" -a -d -d --append -- \
-    "$bin" "$dur" "$min" "$max" "$chunks" "$rounds" "$seed" "$thr" >/dev/null 2>&1 || true
+  local base="$OUT_DIR/larson_${tag}"
+  local outfile="${base}.txt"
+  local outlog="${base}.stdout"
+  local errlog="${base}.stderr"
+  : >"$outfile"; : >"$outlog"; : >"$errlog"
+
+  echo "== $name threads=$thr ==" | tee -a "$outfile"
+
+  # Warm-up quick run (avoid one-time inits skew). Always bounded by timeout.
+  if [[ "$name" != "hakmem" ]]; then
+    TIMEOUT "$((dur+2))"s "$bin" 1 "$min" "$max" "$chunks" "$rounds" "$seed" "$thr" \
+      >>"$outlog" 2>>"$errlog" || true
+  fi
+
+  # Throughput run with timeout; capture both stdout/stderr to logs
+  echo "[cmd] $bin $dur $min $max $chunks $rounds $seed $thr" | tee -a "$outfile"
+  TIMEOUT "$((dur+3))"s "$bin" "$dur" "$min" "$max" "$chunks" "$rounds" "$seed" "$thr" \
+    >>"$outlog" 2>>"$errlog" || true
+  # Extract a single Throughput line from the captured stdout
+  local tput_line
+  if command -v rg >/dev/null 2>&1; then
+    tput_line=$(rg -n "Throughput" -m 1 "$outlog" || true)
+  else
+    tput_line=$(grep -n "Throughput" "$outlog" | head -n1 || true)
+  fi
+  [[ -n "$tput_line" ]] && echo "$tput_line" | tee -a "$outfile" || echo "(no Throughput line)" | tee -a "$outfile"
+
+  # perf stat (optional; if perf not present, skip gracefully)
+  if command -v perf >/dev/null 2>&1; then
+    TIMEOUT "$((dur+3))"s perf stat -o "$outfile" -a -d -d --append -- \
+      "$bin" "$dur" "$min" "$max" "$chunks" "$rounds" "$seed" "$thr" \
+      >>"$outlog" 2>>"$errlog" || true
+  else
+    echo "[warn] perf not found; skipping perf stat" | tee -a "$outfile"
+  fi
+
+  echo "[logs] stdout=$outlog stderr=$errlog" | tee -a "$outfile"
 }
 
 for t in "${ts[@]}"; do