pyzmq and fork issues

Script:
---
import zmq
import os

context = zmq.Context()

print os.fork(), os.getpid(), len(os.listdir("/proc/%i/fd" % os.getpid()))

context.term()
---

Output:
$ python testzmq.py
622 619 15
0 622 15
Assertion failed: ok (mailbox.cpp:84)


Output without context.term():
python testzmq.py
777 773 15
0 777 15
Assertion failed: ok (mailbox.cpp:84)
Abgebrochen (Speicherabzug geschrieben)

The last message is German for "segfault (core dumped)"

(gdb) run testzmq.py
...
(gdb) bt
#0  0x00007ffff745e445 in __GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007ffff7461bab in __GI_abort () at abort.c:91
#2  0x00007ffff608ce4a in zmq::zmq_abort(char const*) () from /opt/vls/lib/libzmq.so.1
#3  0x00007ffff609061d in zmq::mailbox_t::recv(zmq::command_t*, int) () from /opt/vls/lib/libzmq.so.1
#4  0x00007ffff609c1fc in zmq::reaper_t::in_event() () from /opt/vls/lib/libzmq.so.1
#5  0x00007ffff608c036 in zmq::epoll_t::loop() () from /opt/vls/lib/libzmq.so.1
#6  0x00007ffff608c104 in zmq::epoll_t::worker_routine(void*) () from /opt/vls/lib/libzmq.so.1
#7  0x00007ffff60a702a in thread_routine () from /opt/vls/lib/libzmq.so.1
#8  0x00007ffff77ece9a in start_thread (arg=0x7ffff2a88700) at pthread_create.c:308
#9  0x00007ffff751a4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()