Hi, This is what I understood as well. I'm not able to get a core for some reason, but provided that event callback is called by different threads, it strongly suggests that current implementation of mod_event_zmq is unsafe as sharing zmq context is not thread-safe. What is the process of creating a ticket, please? Should I sing-up to JIRA? -- Alex. ________________________________________ From: freeswitch-users-bounces@lists.freeswitch.org [freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of João Mesquita [jmesquita@freeswitch.org] Sent: Thursday, August 16, 2012 10:27 PM To: FreeSWITCH Users Help Subject: Re: [Freeswitch-users] mod_event_zmq thread safety I do *think* that events are dispatched by different workers on the core indeed which might be the cause of your problem. ZMQ also has a few asserts on the core that can be quite disruptive and they were working on getting it working more properly. Dunno what's the status of that right now. A core dump would help a lot on any case tho. João Mesquita On Thu, Aug 16, 2012 at 4:23 PM, Alex Massover <alex@jajah.com<mailto:alex@jajah.com>> wrote: Hello, We're using mod_event_zmq module (slightly modified, we use different socket type and IPC instead of TCP), and experience crashes. As far as I understood the module it creates ZMQ context and all event sent by using same context. Events callback is called from different threads, isn't it? And can be a situation when different threads access send() api on this context simultaneously. ZMQ guide strongly prohibits doing that: " You MUST NOT share ØMQ sockets between threads." And when I do a mutex around send() there're no more crashes (at least today). Am I missing something or mod_event_zmq is potentially dangerous? -- Best Regards, Alex Massover _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org<mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com Official FreeSWITCH Sites http://www.freeswitch.org http://wiki.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org<mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org