no more PF in kmain, but still PF in process OR corruption of fb

src/mem/heap/kheap.h

@@ -14,13 +14,15 @@
 
 #include <stdbool.h>
 #include <stddef.h>
+#include <stdint.h>
 
 struct heap_block_t
 {
     size_t size;
-    bool free;
+    bool free; // 1byte
+    uint8_t reserved[7]; // (7+1 = 8 bytes)
     struct heap_block_t* next;
-};
+} __attribute__((aligned(16)));
 
 void kheap_init();
 void* kmalloc(size_t size);