helge@swiftywily:~/dev/Swift/linux-gcd-issue$ .build/debug/sockd
listening ...

helge@zpro ~ $ telnet swiftywily 1337
Trying 192.168.88.50...
Connected to swiftywily.
Escape character is '^]'.

FD: 6

Enter Anything, say: Hello World RETURN

CHANNEL READ: false Optional(Dispatch.DispatchData(__wrapped: Dispatch.__DispatchData)) 0
Illegal instruction (core dumped)

helge@swiftywily:~/dev/Swift/linux-gcd-issue$ lldb .build/debug/sockd
(lldb) target create ".build/debug/sockd"
Current executable set to '.build/debug/sockd' (x86_64).
(lldb) r
Process 1139 launched: '/home/helge/dev/Swift/linux-gcd-issue/.build/debug/sockd' (x86_64)
listening ...
  FD: 6
  CHANNEL READ: false Optional(Dispatch.DispatchData(__wrapped: Dispatch.__DispatchData)) 0
Process 1139 stopped
* thread #6: tid = 1146, 0x00007ffff7efb503 libdispatch.so`_os_object_release + 35, name = 'sockd', stop reason = signal SIGILL: illegal instruction operand
frame #0: 0x00007ffff7efb503 libdispatch.so`_os_object_release + 35
libdispatch.so`_os_object_release:
->  0x7ffff7efb503 <+35>: ud2    
    0x7ffff7efb505:       nopw   %cs:(%rax,%rax)
libdispatch.so`_os_object_retain_weak:
    0x7ffff7efb510 <+0>:  movl   0xc(%rdi), %eax
    0x7ffff7efb513 <+3>:  movb   $0x1, %cl
(lldb) bt
* thread #6: tid = 1146, 0x00007ffff7efb503 libdispatch.so`_os_object_release + 35, name = 'sockd', stop reason = signal SIGILL: illegal instruction operand
  * frame #0: 0x00007ffff7efb503 libdispatch.so`_os_object_release + 35
    frame #1: 0x00007ffff7ef46b7 libdispatch.so`_dispatch_call_block_and_release + 7
    frame #2: 0x00007ffff7f00d01 libdispatch.so`_dispatch_queue_serial_drain + 769
    frame #3: 0x00007ffff7f01362 libdispatch.so`_dispatch_queue_invoke + 914
    frame #4: 0x00007ffff7f00c3a libdispatch.so`_dispatch_queue_serial_drain + 570
    frame #5: 0x00007ffff7f01362 libdispatch.so`_dispatch_queue_invoke + 914
    frame #6: 0x00007ffff7f03442 libdispatch.so`_dispatch_root_queue_drain + 306
    frame #7: 0x00007ffff7f2ad17 libdispatch.so`overcommit_worker_main(unused=<unavailable>) + 183 at manager.c:287 [opt]
    frame #8: 0x00007ffff78196aa libpthread.so.0`start_thread + 202
    frame #9: 0x00007ffff68a713d libc.so.6`clone + 109