[zeromq-dev] random crashs and double disconnect events

Stefan Kaes Stefan.Kaes at xing.com
Fri Nov 28 14:03:08 CET 2014


I’m a bit confused now: does this mean no multi threaded application can use monitoring safely?

— stefan

This was in fact a scheduling issue, not a zeromq issue. The number of
iothreads must be limited to one in order to process the
accepted/disconnected/... events in te required order.
Sorry for the noise.
Francis

On 11/20/2014 1:16 PM, Francis Le Bourse wrote:
Hi,

I have observed random crashs in zeromq, for example in
mailbox::recv() at assert(ok), and double disconnect sequences on
servers when monitoring is active
     - event_accepted(fd, addr)
     - event_disconnected(fd, addr)
     - a second event_disconnectd(same fd, addr) sometimes later.

The attached test programs exhibits the issue after a few minutes. The
most frequent error is the double disconnect but another random crash
may occur.
Start:
     ./tserver
     ./tclient

Tested on Centos 6.5 and 6.6, zeromq-3.2.4, czmq-2.0.3

Cheers,
Francis



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