[osboxes@osboxes linux-5.1.2]$ ./linux ubd0=CentOS6.x-AMD64-root_fs

    Core dump limits :
    soft - NONE
    hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking environment variables for a tempdir...none found
Checking if /dev/shm is on tmpfs...OK
Checking PROT_EXEC mmap in /dev/shm...OK
Adding 10379264 bytes to physical memory to account for exec-shield gap
Aborted (core dumped)
[osboxes@osboxes linux-5.1.2]$ ./linux ubd0=CentOS6.x-x86-root_fs
Core dump limits :
    soft - NONE
    hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking environment variables for a tempdir...none found
Checking if /dev/shm is on tmpfs...OK
Checking PROT_EXEC mmap in /dev/shm...OK
Adding 31260672 bytes to physical memory to account for exec-shield gap
Aborted (core dumped)