tune_tcp_socket aborts the process with "Invalid argument"

[kcarnold]

I'm seeing periodic crashes of spyder on OS X, and in some of them the crashed thread is ZeroMQ:

Thread 33 Crashed:
0   libsystem_kernel.dylib          0x00007fff92d29f06 __pthread_kill + 10
1   libsystem_pthread.dylib         0x00007fff885dc4ec pthread_kill + 90
2   libsystem_c.dylib               0x00007fff9081d6df abort + 129
3   libzmq.so                       0x000000012c18c079 zmq::zmq_abort(char const*) + 9
4   libzmq.so                       0x000000012c1b2c10 zmq::tune_tcp_socket(int) + 112
5   libzmq.so                       0x000000012c1b61c8 zmq::tcp_listener_t::in_event() + 88
6   libzmq.so                       0x000000012c190100 zmq::kqueue_t::loop() + 384
7   libzmq.so                       0x000000012c1b6a70 thread_routine + 48
8   libsystem_pthread.dylib         0x00007fff885d999d _pthread_body + 131
9   libsystem_pthread.dylib         0x00007fff885d991a _pthread_start + 168
10  libsystem_pthread.dylib         0x00007fff885d7351 thread_start + 13

The terminal output is

Invalid argument (bundled/zeromq/src/tcp.cpp:60)
Abort trap: 6

OS X 10.11.6, zeromq 4.1.3 from Anaconda, pyzmq 15.4.0 if it matters.

This may be the same issue as #2016, but that (and the linked thread) are on Windows, while I'm seeing this on OS X. Given the fact that spyder crashes for other reasons at other times, I wouldn't rule out memory corruption from something else.

[bluca]

Should be the same as #2334 fixed by #2492