After Upgrade to Libzmq-4.3.3 from 4.1.4 user process crash observed during user process bringdown

[srkvenkatesh]

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Issue description

Process crash observed with libzmq-4.3.3 library during prorcess bringdown when node reload is issued

Environment

• libzmq version (commit hash if unreleased): 4.3.3

• OS: GNU/Linux/4.14.188

Minimal test code / Steps to reproduce the issue

1. lib zmq 4.3.3 part of a process
2. User process invokes zmq_poll()
3. During reload of node, when a bring down is initiated, crash is observed with BT pointing inside libzmq code.

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

Process Crash is observed.

Stacktrace:
#0 0x00007fefa40b5920 in raise ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib64/libc.so.6
#1 0x00007fefa40b6b01 in abort ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib64/libc.so.6
#2 0x00007fefa40ae46d in __assert_fail_base ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib64/libc.so.6
#3 0x00007fefa40ae522 in __assert_fail ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib64/libc.so.6
#4 0x00007fefa70a5fd2 in mm_free (h=0x1bf8260, ptr=, caller=) at mm_main.c:224
#5 0x00007fefa4efb0ff in zmq::yqueue_t<zmq::msg_t, 256, 64ul>::~yqueue_t() ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib/libzmq.so.5
#6 0x00007fefa4efb544 in zmq::ypipe_t<zmq::msg_t, 256>::~ypipe_t() ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib/libzmq.so.5
#7 0x00007fefa4efb580 in zmq::ypipe_t<zmq::msg_t, 256>::~ypipe_t() ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib/libzmq.so.5
#8 0x00007fefa4ef97d8 in zmq::pipe_t::process_hiccup(void*) ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib/libzmq.so.5
#9 0x00007fefa4ef101d in zmq::object_t::process_command(zmq::command_t const&) ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib/libzmq.so.5
#10 0x00007fefa4f14a07 in zmq::socket_base_t::process_commands(int, bool) ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib/libzmq.so.5
#11 0x00007fefa4f10d74 in zmq::socket_base_t::getsockopt(int, void*, unsigned long*) ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib/libzmq.so.5
#12 0x00007fefa4f39c7b in zmq_getsockopt ()
from /home/venkat/Default/OPUSONE/ArubaOS_MM_syms/lib/libzmq.so.5
#13 0x00007fefa4f3b3a3 in zmq_poll ()

What's the expected result?

Dont expect a crash

[srkvenkatesh]

Please let me know if there exists a solution to avoid the crash