With current (20190501) smartos bits, ubuntu 18.04 lx instances are unable to perform basic operations like "apt update" because ldconfig.real hits:
root@c9085fb1-364f-4186-c007-d416b630a59a:~# ldconfig.real
Segmentation fault (core dumped)
root@c9085fb1-364f-4186-c007-d416b630a59a:~# /native/usr/bin/mdb core
Loading modules: [ libc.so.1 ld.so.1 ]
> ::status
debugging core file of ldconfig.real (64-bit) from c9085fb1-364f-4186-c007-d416b630a59a
file: /sbin/ldconfig.real
initial argv: ldconfig.real
threading model: native threads
status: process terminated by SIGSEGV (Segmentation Fault), addr=818
> $C
0000000000000068 0x7fffef062aed()
> 0x7fffef062aed::dis
0x7fffef062aed: movups %xmm0,(%rdi)
0x7fffef062af0: movups %xmm1,0x10(%rdi)
0x7fffef062af4: movups %xmm2,-0x10(%rdi,%rdx)
0x7fffef062af9: movups %xmm3,-0x20(%rdi,%rdx)
0x7fffef062afe: ret
0x7fffef062aff: cmpq %rsi,%rdi
0x7fffef062b02: ja +0x8c <0x7fffef062b94>
0x7fffef062b08: je -0xd8 <0x7fffef062a36>
0x7fffef062b0e: movups (%rsi),%xmm4
0x7fffef062b11: movups -0x10(%rsi,%rdx),%xmm5
0x7fffef062b16: movups -0x20(%rsi,%rdx),%xmm6
>This is happening quite early - a printf added as the first thing in main() crashes in the same way.