It was completely *********

boot/loader/loader.asm

@@ -170,7 +170,6 @@ _loader64:
     call write
 
     mov qword [newKernelEnd], KERNEL_STACK
-    mov qword [realKernelEnd], realKernelEnd
     mov rdi, [mbInfo]
     mov rsi, [mbMagic]
     mov rdx, GDT64.code

boot/loader/mem/management.inc

@@ -125,6 +125,7 @@ InitStack:
     push rdi
 
     ;; Begin address to fill and length
+    mov qword [realKernelEnd], kernelEnd
     mov rdi, kernelEnd
     mov rcx, KERNEL_STACK - kernelEnd - 16
                                         ; stop before the return address