$ cat ident.S                                                                                                                       
.section ".note.netbsd.ident", "a", @note
.long 2f-1f
.long 4f-3f
.long 1
1: .asciz "NetBSD"
2: .p2align 2
3: .long 700000001
4: .p2align 2
185 kamil@chieftec /tmp $ cat main.c                                                                                                                        
int
_start(int argc, char **argv)
{
        int a[10] = {};

        a[argc + 20] = a[argc + 50]; // toast

        __asm__ __volatile__(
                "movq $1, %rax\n" // SYS_exit
                "syscall\n");
}
$ 
$  gcc -g -O0 -nostdlib main.c ident.S
$ LD_LIBRARY_PATH=/usr/local/lib lldb -- valgrind ./a.out  
(lldb) target create "valgrind"
Current executable set to 'valgrind' (x86_64).
(lldb) settings set -- target.run-args  "./a.out"
(lldb) r
Process 5985 launched: '/usr/pkg/bin/valgrind' (x86_64)
Process 5985 stopped
* thread #1, stop reason = exec
    frame #0: 0x00000000380ffb3d valgrind`__start
valgrind`__start:
->  0x380ffb3d <+0>:  movq   $0x3a79ad20, %rdi         ; imm = 0x3A79AD20 
    0x380ffb44 <+7>:  addq   $0x2000, %rdi             ; imm = 0x2000 
    0x380ffb4b <+14>: addq   $0x100000, %rdi           ; imm = 0x100000 
    0x380ffb52 <+21>: andq   $-0x10, %rdi
(lldb) c
Process 5985 resuming
==5985== Memcheck, a memory error detector
==5985== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==5985== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
==5985== Command: ./a.out
==5985== 
==5985== Invalid read of size 4
==5985==    at 0x400142: ???
==5985==  Address 0x7fb0039b8 is not stack'd, malloc'd or (recently) free'd
==5985== 
Process 5985 stopped
* thread #1, stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
    frame #0: 0x0000000402a9524c
->  0x402a9524c: movl   (%rbx), %r10d
    0x402a9524f: movl   %r10d, %ebx
    0x402a95252: movq   %r14, 0x3c0(%rbp)
    0x402a95259: movq   %rbx, 0x20(%rbp)
(lldb) bt
* thread #1, stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
  * frame #0: 0x0000000402a9524c
(lldb)