--- core/hakmem.c.orig
+++ core/hakmem.c
@@ -786,6 +786,13 @@
         return;
     }

+    // DEBUG: Free path statistics
+    static __thread uint64_t mid_mt_local_free = 0;
+    static __thread uint64_t mid_mt_registry_free = 0;
+    static __thread uint64_t tiny_slab_free = 0;
+    static __thread uint64_t other_free = 0;
+    static __thread uint64_t total_free = 0;
+
     // OPTIMIZATION: Check Mid Range MT FIRST (for bench_mid_large_mt workload)
     // This benchmark is 100% Mid MT allocations, so check Mid MT before Tiny
     // to avoid the 1.1% overhead of hak_tiny_owner_slab() lookup
@@ -807,6 +814,15 @@
                 seg->free_list = ptr;            // Update head
                 seg->used_count--;
+                // DEBUG stats
+                mid_mt_local_free++;
+                total_free++;
+                if (total_free % 100000 == 0) {
+                    fprintf(stderr, "[FREE STATS] Total=%llu MidLocal=%llu (%.1f%%) MidRegistry=%llu (%.1f%%) Tiny=%llu (%.1f%%) Other=%llu (%.1f%%)\n",
+                        total_free,
+                        mid_mt_local_free, 100.0 * mid_mt_local_free / total_free,
+                        mid_mt_registry_free, 100.0 * mid_mt_registry_free / total_free,
+                        tiny_slab_free, 100.0 * tiny_slab_free / total_free,
+                        other_free, 100.0 * other_free / total_free);
+                }
                 #if HAKMEM_DEBUG_TIMING
                 HKM_TIME_END(HKM_CAT_HAK_FREE, t0);
                 #endif
@@ -819,6 +835,15 @@
         if (mid_registry_lookup(ptr, &mid_block_size, &mid_class_idx)) {
             // Found in Mid MT registry - free it
             mid_mt_free(ptr, mid_block_size);
+            // DEBUG stats
+            mid_mt_registry_free++;
+            total_free++;
+            if (total_free % 100000 == 0) {
+                fprintf(stderr, "[FREE STATS] Total=%llu MidLocal=%llu (%.1f%%) MidRegistry=%llu (%.1f%%) Tiny=%llu (%.1f%%) Other=%llu (%.1f%%)\n",
+                    total_free,
+                    mid_mt_local_free, 100.0 * mid_mt_local_free / total_free,
+                    mid_mt_registry_free, 100.0 * mid_mt_registry_free / total_free,
+                    tiny_slab_free, 100.0 * tiny_slab_free / total_free,
+                    other_free, 100.0 * other_free / total_free);
+            }
             #if HAKMEM_DEBUG_TIMING
             HKM_TIME_END(HKM_CAT_HAK_FREE, t0);
             #endif
@@ -838,6 +863,15 @@
     TinySlab* tiny_slab = hak_tiny_owner_slab(ptr);
     if (tiny_slab) {
         hak_tiny_free(ptr);
+        // DEBUG stats
+        tiny_slab_free++;
+        total_free++;
+        if (total_free % 100000 == 0) {
+            fprintf(stderr, "[FREE STATS] Total=%llu MidLocal=%llu (%.1f%%) MidRegistry=%llu (%.1f%%) Tiny=%llu (%.1f%%) Other=%llu (%.1f%%)\n",
+                total_free,
+                mid_mt_local_free, 100.0 * mid_mt_local_free / total_free,
+                mid_mt_registry_free, 100.0 * mid_mt_registry_free / total_free,
+                tiny_slab_free, 100.0 * tiny_slab_free / total_free,
+                other_free, 100.0 * other_free / total_free);
+        }
         #if HAKMEM_DEBUG_TIMING
         HKM_TIME_END(HKM_CAT_HAK_FREE, t0);
         #endif