[zeromq-dev] zmq_msg_send blocks reading from zmq::mailbox_t

[Marcin Romaszewicz]

On Thu, Jul 2, 2015 at 11:16 AM, Pieter Hintjens <ph at imatix.com> wrote:

> Can you make a minimal test case?
>
>
I'm trying, yes, but so far, no luck. Our zmq-based message routers are
complex and have many sockets in many states at any given time, and this
only happens after some amount of communication has already happened. I'll
post the minimal test case here if I can come up with one.


> On Thu, Jul 2, 2015 at 2:12 AM, Marcin Romaszewicz <marcin at brkt.com>
> wrote:
> > Hi Guys,
> >
> > We had our prod systems running on 3.2.4, and to work around some file
> > descriptor leaks, I'm testing 4.1.2 before back-porting jbreams'
> heartbeats
> > patch, and testing unmodified 4.1.2 is failing for me in production.
> >
> > I've got ZMQ_ROUTER sockets wedged in zmq_msg_send, spinning in a while
> > (True) loop calling recv() on mailbox in zmq::socket_base_t::send().
> >
> > Before I start chasing the cause of this, is there a known mistake on my
> > part which could cause this?
> >
> > The socket is a ZMQ_ROUTER, with all settings at default except for
> > ZMQ_LINGER=0 and ZMQ_ROUTER_MANDATORY=1
> >
> > I'm pretty sure I'm sending stuff to a dead peer, but not 100% certain
> yet.
> >
> > Any tips on what I should be looking for to diagnose this? The same code,
> > unmodified, doesn't have this issue against zmq 3.2.4.
> >
> > Thanks,
> > -- Marcin
> >
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> >
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