SVN r345859: libxo broke netstat?

[Enji Cooper]

> On Apr 5, 2019, at 5:19 AM, Michael Butler <imb at protected-networks.net> wrote:
> 
> Something changed in libxo that causes 'netstat -i' to segfault as below:
> 
> imb at toshi:/usr/src/usr.bin/netstat> lldb
> /usr/obj/usr/src/amd64.amd64/usr.bin/netstat/netstat
> (lldb) target create "/usr/obj/usr/src/amd64.amd64/usr.bin/netstat/netstat"
> Current executable set to
> '/usr/obj/usr/src/amd64.amd64/usr.bin/netstat/netstat' (x86_64).
> (lldb) run -i
> Process 65948 launching
> Process 65948 launched:
> '/usr/obj/usr/src/amd64.amd64/usr.bin/netstat/netstat' (x86_64)
> Name    Mtu Network       Address              Ipkts Ierrs Idrop
> Opkts Oerrs  Coll
> Process 65948 stopped
> * thread #1, name = 'netstat', stop reason = signal SIGSEGV: invalid
> address (fault address: 0x0)
>    frame #0: 0x00000008002987ad
> libxo.so.0`___lldb_unnamed_symbol30$$libxo.so.0 + 669
> libxo.so.0`___lldb_unnamed_symbol30$$libxo.so.0:
> ->  0x8002987ad <+669>: movsbl (%r12), %eax
>    0x8002987b2 <+674>: movslq %eax, %rbx
>    0x8002987b5 <+677>: movq   0xac04(%rip), %r13
>    0x8002987bc <+684>: testl  %eax, %eax
> (lldb) bt
> * thread #1, name = 'netstat', stop reason = signal SIGSEGV: invalid
> address (fault address: 0x0)
>  * frame #0: 0x00000008002987ad
> libxo.so.0`___lldb_unnamed_symbol30$$libxo.so.0 + 669
>    frame #1: 0x0000000800294e09
> libxo.so.0`___lldb_unnamed_symbol24$$libxo.so.0 + 1401
>    frame #2: 0x0000000800293b91
> libxo.so.0`___lldb_unnamed_symbol22$$libxo.so.0 + 609
>    frame #3: 0x0000000800293df0 libxo.so.0`xo_emit + 256
>    frame #4: 0x0000000000212dc5 netstat`intpr + 1669
>    frame #5: 0x0000000000217ecf netstat`main + 2431
>    frame #6: 0x000000000021210f netstat`__fini_array_end + 271

Michael,
	Could you please file a PR for this?
Thank you!
-Enji