1. Have 4 disks attached
2. All disklabeled as 1GB root and (some) 470GB raid partition
3. boot from network to start sysinst (netwok is just an example)
4. e: Utililty
5. d: Partition a disk
6. m: Create software RAID (photo 1)
7. a: Disks: (photo 2)
8. a: Add: (photo 3)

• get sysinst and sysinst.core

  -r-xr-xr-x  1 makoto  wheel  2419136 Dec 23 15:25 sysinst
  -rw-------  1 makoto  wheel   563112 Dec 23 15:23 sysinst.core
  

• gdb sysinst sysinst.core

  CF-SX2@makoto 16:09:47/181223(..prep/sysinst-segfault)% gdb sysinst sysinst.core
  GNU gdb (GDB) 8.0.1
  ..
  warning: exec file is newer than core file.
  [New process 1]
  Core was generated by `sysinst'.
  Program terminated with signal SIGSEGV, Segmentation fault.
  #0  0x00000000004b26a8 in ?? ()
  (gdb) bt
  #0  0x00000000004b26a8 in ?? ()
  #1  0x0000000000000001 in ?? ()
  #2  0x00007f7fffffc140 in ?? ()
  #3  0x0000000000000000 in ?? ()
  (gdb) 
  

• objdump -d sysinst

    4b2661:       5b                      pop    %rbx
    4b2662:       5d                      pop    %rbp
    4b2663:       41 5c                   pop    %r12
    4b2665:       c3                      retq   
  
    4b2666:       41 55                   push   %r13
    4b2668:       41 54                   push   %r12
    4b266a:       55                      push   %rbp
    4b266b:       53                      push   %rbx
    4b266c:       51                      push   %rcx
    4b266d:       48 89 fd                mov    %rdi,%rbp
    4b2670:       41 89 d4                mov    %edx,%r12d
    4b2673:       85 f6                   test   %esi,%esi
    4b2675:       79 23                   jns    0x4b269a
    4b2677:       31 db                   xor    %ebx,%ebx
    4b2679:       45 31 ed                xor    %r13d,%r13d
    4b267c:       44 89 e2                mov    %r12d,%edx
    4b267f:       44 89 ee                mov    %r13d,%esi
    4b2682:       48 89 ef                mov    %rbp,%rdi
    4b2685:       e8 dc ff ff ff          callq  0x4b2666
    4b268a:       01 c3                   add    %eax,%ebx
    4b268c:       41 ff c5                inc    %r13d
    4b268f:       41 83 fd 10             cmp    $0x10,%r13d
    4b2693:       75 e7                   jne    0x4b267c
    4b2695:       e9 02 01 00 00          jmpq   0x4b279c
    4b269a:       48 8b 3d 17 36 42 00    mov    0x423617(%rip),%rdi        # 0x8d5cb8
    4b26a1:       48 8d 87 a0 01 00 00    lea    0x1a0(%rdi),%rax
    4b26a8:       83 3f 00                cmpl   $0x0,(%rdi)
    4b26ab:       74 34                   je     0x4b26e1
    4b26ad:       48 3b 6f 10             cmp    0x10(%rdi),%rbp
    4b26b1:       75 2e                   jne    0x4b26e1
    4b26b3:       3b 77 38                cmp    0x38(%rdi),%esi
    4b26b6:       75 29                   jne    0x4b26e1
    4b26b8:       bb 01 00 00 00          mov    $0x1,%ebx
    4b26bd:       45 85 e4                test   %r12d,%r12d
    4b26c0:       0f 84 d6 00 00 00       je     0x4b279c
    4b26c6:       48 c7 47 10 00 00 00    movq   $0x0,0x10(%rdi)
    4b26cd:       00 
    4b26ce:       48 83 c7 18             add    $0x18,%rdi
    4b26d2:       be 94 37 5a 00          mov    $0x5a3794,%esi
    4b26d7:       e8 94 3e 09 00          callq  0x546570
    4b26dc:       e9 bb 00 00 00          jmpq   0x4b279c
    4b26e1:       48 83 c7 68             add    $0x68,%rdi
    4b26e5:       48 39 f8                cmp    %rdi,%rax
    4b26e8:       75 be                   jne    0x4b26a8
    4b26ea:       48 8b 05 87 35 42 00    mov    0x423587(%rip),%rax        # 0x8d5c78
    4b26f1:       4c 8d 80 80 46 00 00    lea    0x4680(%rax),%r8
    4b26f8:       8b 38                   mov    (%rax),%edi
    4b26fa:       31 d2                   xor    %edx,%edx
    4b26fc:       85 ff                   test   %edi,%edi
    4b26fe:       74 2e                   je     0x4b272e
  

＠ but this works OK if sysinst is started in userland:

I've copied the suspicious sysinstall binary to normal running 8.0 and started. Works fine ;-( That is also true for /usr/sbin/sysinstall