The program ocassionly crash in zmq, when program exits

[leeshineSZ]

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Issue description

The program ocassionly crash in zmq, when programe exits. It only appears when the program exits, when the promgram running, the zmq work no problem.

#0 0x0000007fb2d62ee4 in raise () from /lib/libc.so.6
No symbol table info available.
#1 0x0000007fb2d4fa78 in abort () from /lib/libc.so.6
No symbol table info available.
#2 0x0000007fb34457ec in zmq::zmq_abort(char const*) () from /usr/lib/libzmq.so.5
No symbol table info available.
#3 0x0000007fb3445084 in zmq::epoll_t::add_fd(int, zmq::i_poll_events*) () from /usr/lib/libzmq.so.5
No symbol table info available.
#4 0x0000007fb346f20c in zmq::tcp_connecter_t::start_connecting() () from /usr/lib/libzmq.so.5
No symbol table info available.
#5 0x0000007fb3457f38 in zmq::poller_base_t::execute_timers() () from /usr/lib/libzmq.so.5
No symbol table info available.
#6 0x0000007fb3444ba8 in zmq::epoll_t::loop() () from /usr/lib/libzmq.so.5
No symbol table info available.
#7 0x0000007fb3470208 in ?? () from /usr/lib/libzmq.so.5
No symbol table info available.
#8 0x0000007fb34efa44 in ?? () from /lib/libpthread.so.0
No symbol table info available.
#9 0x0000007fb2dfdddc in ?? () from /lib/libc.so.6

Environment

arm

• libzmq version (commit hash if unreleased):
  5.2.4
• OS:
  linux

Minimal test code / Steps to reproduce the issue

What's the actual result? (include assertion message & call stack if applicable)

#0 0x0000007fb2d62ee4 in raise () from /lib/libc.so.6
No symbol table info available.
#1 0x0000007fb2d4fa78 in abort () from /lib/libc.so.6
No symbol table info available.
#2 0x0000007fb34457ec in zmq::zmq_abort(char const*) () from /usr/lib/libzmq.so.5
No symbol table info available.
#3 0x0000007fb3445084 in zmq::epoll_t::add_fd(int, zmq::i_poll_events*) () from /usr/lib/libzmq.so.5
No symbol table info available.
#4 0x0000007fb346f20c in zmq::tcp_connecter_t::start_connecting() () from /usr/lib/libzmq.so.5
No symbol table info available.
#5 0x0000007fb3457f38 in zmq::poller_base_t::execute_timers() () from /usr/lib/libzmq.so.5
No symbol table info available.
#6 0x0000007fb3444ba8 in zmq::epoll_t::loop() () from /usr/lib/libzmq.so.5
No symbol table info available.
#7 0x0000007fb3470208 in ?? () from /usr/lib/libzmq.so.5
No symbol table info available.
#8 0x0000007fb34efa44 in ?? () from /lib/libpthread.so.0
No symbol table info available.
#9 0x0000007fb2dfdddc in ?? () from /lib/libc.so.6

What's the expected result?

Can I resolve the crash?