libzmq aborted on ypipe.hpp::probe when invoking zmq_poll

[Rensj]

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Issue description

When invoking function zmq_poll do poll a zmq dealer, it aborted and the program exited

Environment

• libzmq version (commit hash if unreleased): 4.3.4
• OS: CentOS Linux release 7.9.2009 (Core)

Minimal test code / Steps to reproduce the issue

1. not reproducible for now

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

and gave the following stack back trace:
(gdb) bt
#0 0xb7d0c2a0 in raise () from /lib/libc.so.6
#1 0xb7cf17ac in abort () from /lib/libc.so.6
#2 0x0f779d24 in zmq::zmq_abort (errmsg_=errmsg_@entry=0xf7fb1f8 "rc") at src/err.cpp:88
#3 0x0f7a9158 in zmq::ypipe_t<zmq::msg_t, 256>::probe (this=0x10efaaf0, fn_=0xf7a5af0 <zmq::pipe_t::is_delimiter(zmq::msg_t const&)>) at src/ypipe.hpp:172
#4 0x0f7a73f4 in zmq::pipe_t::check_read (this=0x10fb46d0) at src/pipe.cpp:186
#5 0x0f78f024 in zmq::fq_t::has_in (this=0x10fb4238) at src/fq.cpp:139
#6 0x0f78a128 in zmq::dealer_t::xhas_in (this=) at src/dealer.cpp:113
#7 0x0f7bdfdc in zmq::socket_base_t::has_in (this=0x10fb3d10) at src/socket_base.cpp:1433
#8 zmq::socket_base_t::getsockopt (this=0x10fb3d10, option_=option_@entry=15, optval_=optval_@entry=0x94dbc224, optvallen_=optvallen_@entry=0x94dbc220) at src/socket_base.cpp:488
#9 0x0f7dfff4 in zmq_getsockopt (s_=, option_=option_@entry=15, optval_=optval_@entry=0x94dbc224, optvallen_=optvallen_@entry=0x94dbc220) at src/zmq.cpp:288
#10 0x0f7e28e4 in zmq_poll (items_=0x94dbc450, nitems_=1, timeout_=5000) at src/zmq.cpp:999

What's the expected result?

[bluca]

are you setting up/using the same socket from multiple threads?

[Rensj]

Thanks bluca for the reply.
The same dealer client is used by multiple threads in this case.

[bluca]

As the documentation says, that is not supported and it's a bug in the application.

[Rensj]

Thank you bluca. Changed the code to seperate client as per the threads, and this issue was not observed any more.