[zeromq-dev] 0MQ-based proxy worker crashes with "Assertion failed: pipe (bundled/zeromq/src/session_base.cpp:441)"

Tomas Krajca t.l.krajca at gmail.com
Fri Sep 12 08:26:04 CEST 2014

Does anybody have any idea about the original proxy crash? The proxy did about 80000 requests just fine today and then it crashed with the pipe assertion again, really weird.


> On 10 Sep 2014, at 10:51 am, Tomas Krajca <t.l.krajca at gmail.com> wrote:
> Thanks Justin, zurl is definitely worth looking at.
> Regards,
> Tomas
>> On 9 Sep 2014, at 12:35 pm, Justin Karneges <justin at affinix.com> wrote:
>> Hi Tomas,
>> This does not answer your question at all, but you might be interested 
>> in the Zurl project. It is a 0MQ daemon that does HTTP requests. You can 
>> speak to it with REQ/REP.
>> https://github.com/fanout/zurl
>>> On 09/08/2014 06:44 PM, Tomas Krajca wrote:
>>> Hi,
>>> I've got a 0MQ-based proxy, clients talk 0MQ to the proxy, the proxy
>>> then talks HTTP to do either a GET on a specific url endpoint or a POST
>>> on a specific endpoint (it always goes to one of these two url
>>> endpoints). I've got a master process that has a zmq.ROUTER towards its
>>> clients (zmq.REQ) and a zmq.DEALER towards its workers (zmq.REP). The
>>> master is a single process, no threading, normal 0MQ, it spawns a worker
>>> processes via multiprocessing, this worker process uses gevent and
>>> zmq.green to spawn the actual (green) workers (those use grequests to
>>> talk HTTP). The master uses 0MQ auth to authenticate its clients. It
>>> should all be pretty standard but note that this is my first
>>> gevent/zmq.green based project.
>>> So this proxy runs pretty well untill the worker process (I run only 1
>>> worker process) crashes with 'Assertion failed: pipe
>>> (bundled/zeromq/src/session_base.cpp:441)"' on its stderr. There is
>>> nothing else in the logs or on stdout that would give me any more idea
>>> of what is going on. I can see the master running and netcat to its
>>> zmq.ROUTER so its definitely the worker that dies. Sorry, I have no idea
>>> how to reproduce this, once it crashed after 5 hours of working nicely,
>>> second time it crashed after about a day.
>>> Here is a snippet of the worker code (the relevant bits):
>>> http://pastebin.com/usi0FXDL
>>> The STSDBResponder uses grequests to do the HTTP, there should be
>>> nothing special about that.
>>> This happens on CentOS 6.5, the proxy is running in virtualenv (pip
>>> install pyzmq):
>>> Python 2.7.6 (default, Jul 10 2014, 04:59:13)
>>> [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>>> import zmq
>>>>>> zmq.zmq_version()
>>> '4.0.4'
>>>>>> zmq.__version__
>>> '14.3.1'
>>> I have no idea whether this is a libzmq bug or pyzmq bug or a bug in my
>>> code or a system misconfiguration (do I need to increase ulimit or
>>> something?), I run 64 gevent threads. I tried to see session_base.cpp
>>> but it didn't help me understand why this could happen either.
>>> If anybody could please point me to a direction as to why the worker
>>> crashes, it would be much appreciated.
>>> Thanks,
>>> Tomas
>>> _______________________________________________
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>>> zeromq-dev at lists.zeromq.org
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