[zeromq-dev] Assertion failed: !_more fq.cpp:112

[Doron Somech]

It is usually happens when you are using the socket from multiple threads.

That includes recv, send or polling.


On Fri, Nov 1, 2019, 20:13 Eric Pederson <ericacm at gmail.com> wrote:

> Hello -
>
>
> We are intermittently running into an issue related to:
> https://github.com/zeromq/libzmq/issues/2163
>
>
> In that issue they diagnose the problem as trying read additional parts of
> a message from a SUB socket that has been disconnected.
>
>
> In our code we log whenever we disconnect and we are not getting any log
> messages.  In addition, the logic is single threaded and it's impossible to
> disconnect while a read is taking place.
>
>
> Is it possible for the remote (PUB) side to disconnect while we are in the
> middle of reading to cause this problem?
>
>
> We are running libzmq 4.3.2 on Linux, gcc 5.3.2.
>
>
> The assertion and stack trace are below.
>
>
> Thanks,
>
>
> INF 10/31 12:36:49.544022950 Assertion failed: !_more
> (/libzmq/src/fq.cpp:112)
>
>
>
> Thread 1 (Thread 0x7faf226f1700 (LWP 169912)):
>
> #0  0x00000037de432495 in raise () from /lib64/libc.so.6
>
> #1  0x00000037de433c75 in abort () from /lib64/libc.so.6
>
> #2  0x00000000009571ae in zmq::zmq_abort(char const*) ()
>
> #3  0x0000000000997a08 in zmq::fq_t::recvpipe(zmq::msg_t*, zmq::pipe_t**)
> ()
>
> #4  0x000000000097a1a3 in zmq::xsub_t::xrecv(zmq::msg_t*) ()
>
> #5  0x00000000009674f0 in zmq::socket_base_t::recv(zmq::msg_t*, int) ()
>
> #6  0x0000000000943320 in zmq_msg_recv ()
>
> #7  0x0000000000901691 in zmq::socket_t::recv (flags_=0, this=0x2235540,
> msg_=0x7faf226f0be0) at zmq.hpp:724
>
> #8  ZMQMessageTransport::deliverEvent (this=0x19c3f40, topic="ClassicUser",
>  socket=...) at ZMQMessageTransport.cpp:123
>
> #9  0x000000000090d9e8 in ZmqGroups::event (this=this at entry=0x19c6a00) at
> ZmqGroups.cpp:159
>
> #10 0x000000000090dbbb in ZmqGroups::loop (this=0x19c6a00) at
> ZmqGroups.cpp:74
>
> #11 0x000000000092a524 in ZmqLoop::runTheLoop (self=0x19c6a00) at
> ZmqLoop.cpp:123
>
> #12 0x0000000000f521b0 in execute_native_thread_routine ()
>
> #13 0x00000037de807aa1 in start_thread () from /lib64/libpthread.so.0
>
> #14 0x00000037de4e8bcd in clone () from /lib64/libc.so.6
>
> Any ideas would be appreciated.
>
> Thanks!
>
>
> -- Eric
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>
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