The call to munmap() requires both a stack (which will be unmapped at some point) and the code from libc (which will be unmapped at some time). The program get

The call to munmap() requires both a stack (which will be unmapped at some point) and the code from libc (which will be unmapped at some time). The program gets a list of all the allocated pages first, then creates one more for the JIT code (and a copy of the list) which is unmapped as the last thing it does. There really is no other way of doing it.